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[edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5 tool chain

gaoliming posted 1 patch 2 years, 11 months ago
Failed in applying to current master (apply log)
There is a newer version of this series
BaseTools/Conf/tools_def.template | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
[edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5 tool chain
Posted by gaoliming 2 years, 11 months ago 
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3403

This option can trig the uninitialized warning when lto is enabled.
The image size data is also collected for OVMF. There is no impact.

Cc: Sergei Dmitrouk <sergei@posteo.net>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
---
 BaseTools/Conf/tools_def.template | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
index 498696e583..aad5297385 100755
--- a/BaseTools/Conf/tools_def.template
+++ b/BaseTools/Conf/tools_def.template
@@ -2315,10 +2315,10 @@ RELEASE_GCC49_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
 *_GCC5_IA32_OBJCOPY_FLAGS        =
 *_GCC5_IA32_NASM_FLAGS           = -f elf32
 
-  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -flto -Os
+  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -ffat-lto-objects -flto -Os
   DEBUG_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
 
-RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -flto -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
+RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -ffat-lto-objects -flto -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
 RELEASE_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
 
   NOOPT_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -O0
@@ -2347,10 +2347,10 @@ RELEASE_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,
 *_GCC5_X64_OBJCOPY_FLAGS         =
 *_GCC5_X64_NASM_FLAGS            = -f elf64
 
-  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -flto -DUSING_LTO -Os
+  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -ffat-lto-objects -flto -DUSING_LTO -Os
   DEBUG_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
 
-RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -flto -DUSING_LTO -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
+RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -ffat-lto-objects -flto -DUSING_LTO -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
 RELEASE_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
 
   NOOPT_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -O0
@@ -2382,10 +2382,10 @@ RELEASE_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
 *_GCC5_ARM_VFRPP_FLAGS           = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
 *_GCC5_ARM_CC_XIPFLAGS           = DEF(GCC5_ARM_CC_XIPFLAGS)
 
-  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
+  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
   DEBUG_GCC5_ARM_DLINK_FLAGS     = DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm -Wl,-plugin-opt=-pass-through=-llto-arm
 
-RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
+RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
 RELEASE_GCC5_ARM_DLINK_FLAGS     = DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm -Wl,-plugin-opt=-pass-through=-llto-arm
 
   NOOPT_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -O0
@@ -2416,11 +2416,11 @@ RELEASE_GCC5_ARM_DLINK_FLAGS     = DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKS
 *_GCC5_AARCH64_VFRPP_FLAGS       = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
 *_GCC5_AARCH64_CC_XIPFLAGS       = DEF(GCC5_AARCH64_CC_XIPFLAGS)
 
-  DEBUG_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
+  DEBUG_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
   DEBUG_GCC5_AARCH64_DLINK_FLAGS = DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64 -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
   DEBUG_GCC5_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
 
-RELEASE_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
+RELEASE_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
 RELEASE_GCC5_AARCH64_DLINK_FLAGS = DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64 -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
 RELEASE_GCC5_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
 
-- 
2.27.0.windows.1




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Re: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5 tool chain
Posted by Yao, Jiewen 2 years, 11 months ago 
Thanks Liming.
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>

Just want to make sure, that this toolchain is covered in the existing CI build process, right?

Thank you
Yao Jiewen

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of gaoliming
> Sent: Wednesday, May 19, 2021 10:27 AM
> To: devel@edk2.groups.io
> Cc: Sergei Dmitrouk <sergei@posteo.net>; Feng, Bob C <bob.c.feng@intel.com>;
> Ard Biesheuvel <ardb+tianocore@kernel.org>
> Subject: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5
> tool chain
> 
> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3403
> 
> This option can trig the uninitialized warning when lto is enabled.
> The image size data is also collected for OVMF. There is no impact.
> 
> Cc: Sergei Dmitrouk <sergei@posteo.net>
> Cc: Bob Feng <bob.c.feng@intel.com>
> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
> ---
>  BaseTools/Conf/tools_def.template | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/BaseTools/Conf/tools_def.template
> b/BaseTools/Conf/tools_def.template
> index 498696e583..aad5297385 100755
> --- a/BaseTools/Conf/tools_def.template
> +++ b/BaseTools/Conf/tools_def.template
> @@ -2315,10 +2315,10 @@ RELEASE_GCC49_AARCH64_DLINK_XIPFLAGS = -z
> common-page-size=0x20
>  *_GCC5_IA32_OBJCOPY_FLAGS        =
>  *_GCC5_IA32_NASM_FLAGS           = -f elf32
> 
> -  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -flto -Os
> +  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -ffat-lto-
> objects -flto -Os
>    DEBUG_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -
> flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
> 
> -RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -flto -Os -
> Wno-unused-but-set-variable -Wno-unused-const-variable
> +RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -ffat-lto-
> objects -flto -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
>  RELEASE_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -
> flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
> 
>    NOOPT_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -O0
> @@ -2347,10 +2347,10 @@ RELEASE_GCC5_IA32_DLINK_FLAGS    =
> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,
>  *_GCC5_X64_OBJCOPY_FLAGS         =
>  *_GCC5_X64_NASM_FLAGS            = -f elf64
> 
> -  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -flto -
> DUSING_LTO -Os
> +  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -ffat-lto-
> objects -flto -DUSING_LTO -Os
>    DEBUG_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
> 
> -RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -flto -
> DUSING_LTO -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
> +RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -ffat-lto-
> objects -flto -DUSING_LTO -Os -Wno-unused-but-set-variable -Wno-unused-
> const-variable
>  RELEASE_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
> 
>    NOOPT_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -O0
> @@ -2382,10 +2382,10 @@ RELEASE_GCC5_X64_DLINK_FLAGS     =
> DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
>  *_GCC5_ARM_VFRPP_FLAGS           = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS)
> DEF(GCC_VFRPP_FLAGS)
>  *_GCC5_ARM_CC_XIPFLAGS           = DEF(GCC5_ARM_CC_XIPFLAGS)
> 
> -  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -flto -Wno-
> unused-but-set-variable -Wno-unused-const-variable
> +  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -ffat-lto-
> objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>    DEBUG_GCC5_ARM_DLINK_FLAGS     = DEF(GCC5_ARM_DLINK_FLAGS) -flto -
> Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm -Wl,-plugin-opt=-pass-
> through=-llto-arm
> 
> -RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -flto -Wno-
> unused-but-set-variable -Wno-unused-const-variable
> +RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -ffat-lto-
> objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>  RELEASE_GCC5_ARM_DLINK_FLAGS     = DEF(GCC5_ARM_DLINK_FLAGS) -flto -
> Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm -Wl,-plugin-opt=-pass-
> through=-llto-arm
> 
>    NOOPT_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -O0
> @@ -2416,11 +2416,11 @@ RELEASE_GCC5_ARM_DLINK_FLAGS     =
> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKS
>  *_GCC5_AARCH64_VFRPP_FLAGS       = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS)
> DEF(GCC_VFRPP_FLAGS)
>  *_GCC5_AARCH64_CC_XIPFLAGS       = DEF(GCC5_AARCH64_CC_XIPFLAGS)
> 
> -  DEBUG_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -flto
> -Wno-unused-but-set-variable -Wno-unused-const-variable
> +  DEBUG_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -
> ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>    DEBUG_GCC5_AARCH64_DLINK_FLAGS = DEF(GCC5_AARCH64_DLINK_FLAGS)
> -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64 -Wl,-plugin-
> opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
>    DEBUG_GCC5_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
> 
> -RELEASE_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -flto
> -Wno-unused-but-set-variable -Wno-unused-const-variable
> +RELEASE_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -
> ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>  RELEASE_GCC5_AARCH64_DLINK_FLAGS = DEF(GCC5_AARCH64_DLINK_FLAGS)
> -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64 -Wl,-plugin-
> opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
>  RELEASE_GCC5_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
> 
> --
> 2.27.0.windows.1
> 
> 
> 
> 
> 
> 



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回复: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5 tool chain
Posted by gaoliming 2 years, 11 months ago 
Yes. GCC5 DEBUG/RELEASE/NOOPT is in current CI build. 

Thanks
Liming
> -----邮件原件-----
> 发件人: Yao, Jiewen <jiewen.yao@intel.com>
> 发送时间: 2021年5月19日 10:36
> 收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
> 抄送: Sergei Dmitrouk <sergei@posteo.net>; Feng, Bob C
> <bob.c.feng@intel.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>
> 主题: RE: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in
> GCC5 tool chain
> 
> Thanks Liming.
> Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
> 
> Just want to make sure, that this toolchain is covered in the existing CI
build
> process, right?
> 
> Thank you
> Yao Jiewen
> 
> > -----Original Message-----
> > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of
> gaoliming
> > Sent: Wednesday, May 19, 2021 10:27 AM
> > To: devel@edk2.groups.io
> > Cc: Sergei Dmitrouk <sergei@posteo.net>; Feng, Bob C
> <bob.c.feng@intel.com>;
> > Ard Biesheuvel <ardb+tianocore@kernel.org>
> > Subject: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in
> GCC5
> > tool chain
> >
> > BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3403
> >
> > This option can trig the uninitialized warning when lto is enabled.
> > The image size data is also collected for OVMF. There is no impact.
> >
> > Cc: Sergei Dmitrouk <sergei@posteo.net>
> > Cc: Bob Feng <bob.c.feng@intel.com>
> > Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> > Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
> > ---
> >  BaseTools/Conf/tools_def.template | 16 ++++++++--------
> >  1 file changed, 8 insertions(+), 8 deletions(-)
> >
> > diff --git a/BaseTools/Conf/tools_def.template
> > b/BaseTools/Conf/tools_def.template
> > index 498696e583..aad5297385 100755
> > --- a/BaseTools/Conf/tools_def.template
> > +++ b/BaseTools/Conf/tools_def.template
> > @@ -2315,10 +2315,10 @@ RELEASE_GCC49_AARCH64_DLINK_XIPFLAGS
> = -z
> > common-page-size=0x20
> >  *_GCC5_IA32_OBJCOPY_FLAGS        =
> >  *_GCC5_IA32_NASM_FLAGS           = -f elf32
> >
> > -  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -flto -Os
> > +  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -ffat-lto-
> > objects -flto -Os
> >    DEBUG_GCC5_IA32_DLINK_FLAGS    =
> DEF(GCC5_IA32_X64_DLINK_FLAGS) -
> > flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
> >
> > -RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -flto -Os -
> > Wno-unused-but-set-variable -Wno-unused-const-variable
> > +RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -ffat-lto-
> > objects -flto -Os -Wno-unused-but-set-variable
-Wno-unused-const-variable
> >  RELEASE_GCC5_IA32_DLINK_FLAGS    =
> DEF(GCC5_IA32_X64_DLINK_FLAGS) -
> > flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
> >
> >    NOOPT_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -O0
> > @@ -2347,10 +2347,10 @@ RELEASE_GCC5_IA32_DLINK_FLAGS    =
> > DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,
> >  *_GCC5_X64_OBJCOPY_FLAGS         =
> >  *_GCC5_X64_NASM_FLAGS            = -f elf64
> >
> > -  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -flto -
> > DUSING_LTO -Os
> > +  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -ffat-lto-
> > objects -flto -DUSING_LTO -Os
> >    DEBUG_GCC5_X64_DLINK_FLAGS     =
> DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
> >
> > -RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -flto -
> > DUSING_LTO -Os -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> > +RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -ffat-lto-
> > objects -flto -DUSING_LTO -Os -Wno-unused-but-set-variable
> -Wno-unused-
> > const-variable
> >  RELEASE_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS)
> -flto -Os
> >
> >    NOOPT_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -O0
> > @@ -2382,10 +2382,10 @@ RELEASE_GCC5_X64_DLINK_FLAGS     =
> > DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
> >  *_GCC5_ARM_VFRPP_FLAGS           = $(ARCHCC_FLAGS)
> $(PLATFORM_FLAGS)
> > DEF(GCC_VFRPP_FLAGS)
> >  *_GCC5_ARM_CC_XIPFLAGS           =
> DEF(GCC5_ARM_CC_XIPFLAGS)
> >
> > -  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -flto -Wno-
> > unused-but-set-variable -Wno-unused-const-variable
> > +  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -ffat-lto-
> > objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> >    DEBUG_GCC5_ARM_DLINK_FLAGS     =
> DEF(GCC5_ARM_DLINK_FLAGS) -flto -
> > Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm
> -Wl,-plugin-opt=-pass-
> > through=-llto-arm
> >
> > -RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -flto -Wno-
> > unused-but-set-variable -Wno-unused-const-variable
> > +RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -ffat-lto-
> > objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> >  RELEASE_GCC5_ARM_DLINK_FLAGS     =
> DEF(GCC5_ARM_DLINK_FLAGS) -flto -
> > Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm
> -Wl,-plugin-opt=-pass-
> > through=-llto-arm
> >
> >    NOOPT_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -O0
> > @@ -2416,11 +2416,11 @@ RELEASE_GCC5_ARM_DLINK_FLAGS     =
> > DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKS
> >  *_GCC5_AARCH64_VFRPP_FLAGS       = $(ARCHCC_FLAGS)
> $(PLATFORM_FLAGS)
> > DEF(GCC_VFRPP_FLAGS)
> >  *_GCC5_AARCH64_CC_XIPFLAGS       =
> DEF(GCC5_AARCH64_CC_XIPFLAGS)
> >
> > -  DEBUG_GCC5_AARCH64_CC_FLAGS    =
> DEF(GCC5_AARCH64_CC_FLAGS) -flto
> > -Wno-unused-but-set-variable -Wno-unused-const-variable
> > +  DEBUG_GCC5_AARCH64_CC_FLAGS    =
> DEF(GCC5_AARCH64_CC_FLAGS) -
> > ffat-lto-objects -flto -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> >    DEBUG_GCC5_AARCH64_DLINK_FLAGS =
> DEF(GCC5_AARCH64_DLINK_FLAGS)
> > -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64
> -Wl,-plugin-
> > opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
> >    DEBUG_GCC5_AARCH64_DLINK_XIPFLAGS = -z
> common-page-size=0x20
> >
> > -RELEASE_GCC5_AARCH64_CC_FLAGS    =
> DEF(GCC5_AARCH64_CC_FLAGS) -flto
> > -Wno-unused-but-set-variable -Wno-unused-const-variable
> > +RELEASE_GCC5_AARCH64_CC_FLAGS    =
> DEF(GCC5_AARCH64_CC_FLAGS) -
> > ffat-lto-objects -flto -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> >  RELEASE_GCC5_AARCH64_DLINK_FLAGS =
> DEF(GCC5_AARCH64_DLINK_FLAGS)
> > -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64
> -Wl,-plugin-
> > opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
> >  RELEASE_GCC5_AARCH64_DLINK_XIPFLAGS = -z
> common-page-size=0x20
> >
> > --
> > 2.27.0.windows.1
> >
> >
> >
> >
> > 
> >





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Re: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5 tool chain
Posted by Laszlo Ersek 2 years, 11 months ago 
Hi Liming,

On 05/19/21 04:27, gaoliming wrote:
> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3403
> 
> This option can trig the uninitialized warning when lto is enabled.
> The image size data is also collected for OVMF. There is no impact.
> 
> Cc: Sergei Dmitrouk <sergei@posteo.net>
> Cc: Bob Feng <bob.c.feng@intel.com>
> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
> ---
>  BaseTools/Conf/tools_def.template | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)

I've now read the documentation on "-ffat-lto-objects", and I agree that
it should not affect the final module executable sizes.

However, I don't understand how this option *helps*. You mention
"uninitialized warning". I find nothing related to that in the
documentation.

According to the documentation, "fat" LTO objects include both object
code and intermediate language (GIMPLE) bytecode. Such objects can then
be linked with, or without, link-time (= interprocedural) optimization.
As I understand the documentation, "fat" LTO objects only make a
difference if there are parts of the toolchain that are themselves
unaware of LTO, and so need the GIMPLE bytecode to be present in the
object files.

I *guess* that this is the situation that we have in edk2 -- is there
perhaps something in our toolchain(s) that does not "notice" LTO without
"fat" LTO objects, and therefore we fail to emit a warning? Because,
without LTO, we don't notice that an initialization is missing?

This is too speculative. The commit message should please include more
details. I'd like to understand what code in edk2 is affected, what the
specific warning is, what the problematic component in the toolchain is
(i.e., what tool requires GIMPLE bytecode to be present in the object file).

Thanks,
Laszlo



> 
> diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
> index 498696e583..aad5297385 100755
> --- a/BaseTools/Conf/tools_def.template
> +++ b/BaseTools/Conf/tools_def.template
> @@ -2315,10 +2315,10 @@ RELEASE_GCC49_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
>  *_GCC5_IA32_OBJCOPY_FLAGS        =
>  *_GCC5_IA32_NASM_FLAGS           = -f elf32
>  
> -  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -flto -Os
> +  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -ffat-lto-objects -flto -Os
>    DEBUG_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
>  
> -RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -flto -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
> +RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -ffat-lto-objects -flto -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
>  RELEASE_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386
>  
>    NOOPT_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS) -O0
> @@ -2347,10 +2347,10 @@ RELEASE_GCC5_IA32_DLINK_FLAGS    = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,
>  *_GCC5_X64_OBJCOPY_FLAGS         =
>  *_GCC5_X64_NASM_FLAGS            = -f elf64
>  
> -  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -flto -DUSING_LTO -Os
> +  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -ffat-lto-objects -flto -DUSING_LTO -Os
>    DEBUG_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
>  
> -RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -flto -DUSING_LTO -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
> +RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -ffat-lto-objects -flto -DUSING_LTO -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
>  RELEASE_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
>  
>    NOOPT_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS) -O0
> @@ -2382,10 +2382,10 @@ RELEASE_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
>  *_GCC5_ARM_VFRPP_FLAGS           = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
>  *_GCC5_ARM_CC_XIPFLAGS           = DEF(GCC5_ARM_CC_XIPFLAGS)
>  
> -  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> +  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>    DEBUG_GCC5_ARM_DLINK_FLAGS     = DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm -Wl,-plugin-opt=-pass-through=-llto-arm
>  
> -RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> +RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>  RELEASE_GCC5_ARM_DLINK_FLAGS     = DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm -Wl,-plugin-opt=-pass-through=-llto-arm
>  
>    NOOPT_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS) -O0
> @@ -2416,11 +2416,11 @@ RELEASE_GCC5_ARM_DLINK_FLAGS     = DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKS
>  *_GCC5_AARCH64_VFRPP_FLAGS       = $(ARCHCC_FLAGS) $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
>  *_GCC5_AARCH64_CC_XIPFLAGS       = DEF(GCC5_AARCH64_CC_XIPFLAGS)
>  
> -  DEBUG_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> +  DEBUG_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>    DEBUG_GCC5_AARCH64_DLINK_FLAGS = DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64 -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
>    DEBUG_GCC5_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
>  
> -RELEASE_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> +RELEASE_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>  RELEASE_GCC5_AARCH64_DLINK_FLAGS = DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64 -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
>  RELEASE_GCC5_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
>  
> 



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回复: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5 tool chain
Posted by gaoliming 2 years, 11 months ago 
Laszlo:
  Here is the discussion https://edk2.groups.io/g/devel/message/75299. 
  Now, some uninitialized warning can't be detected on GCC5 tool chain, but can be detected on GCC49 tool chain.
  Edk2 CI only covers GCC5 tool chain. So, the merged code may impact GCC49 build. 
  I add this option to expose such uninitialized warning in GCC5 tool chain and increase GCC5 tool chain coverage. 
  
  And, this is gcc issue https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90844
  
  Yes. This change will expose some existing issues. I will include more detail in the commit message for this change.  

Thanks
Liming
> -----邮件原件-----
> 发件人: Laszlo Ersek <lersek@redhat.com>
> 发送时间: 2021年5月19日 15:23
> 收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
> 抄送: Sergei Dmitrouk <sergei@posteo.net>; Bob Feng
> <bob.c.feng@intel.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>
> 主题: Re: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in
> GCC5 tool chain
> 
> Hi Liming,
> 
> On 05/19/21 04:27, gaoliming wrote:
> > BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3403
> >
> > This option can trig the uninitialized warning when lto is enabled.
> > The image size data is also collected for OVMF. There is no impact.
> >
> > Cc: Sergei Dmitrouk <sergei@posteo.net>
> > Cc: Bob Feng <bob.c.feng@intel.com>
> > Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> > Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
> > ---
> >  BaseTools/Conf/tools_def.template | 16 ++++++++--------
> >  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> I've now read the documentation on "-ffat-lto-objects", and I agree that
> it should not affect the final module executable sizes.
> 
> However, I don't understand how this option *helps*. You mention
> "uninitialized warning". I find nothing related to that in the
> documentation.
> 
> According to the documentation, "fat" LTO objects include both object
> code and intermediate language (GIMPLE) bytecode. Such objects can then
> be linked with, or without, link-time (= interprocedural) optimization.
> As I understand the documentation, "fat" LTO objects only make a
> difference if there are parts of the toolchain that are themselves
> unaware of LTO, and so need the GIMPLE bytecode to be present in the
> object files.
> 
> I *guess* that this is the situation that we have in edk2 -- is there
> perhaps something in our toolchain(s) that does not "notice" LTO without
> "fat" LTO objects, and therefore we fail to emit a warning? Because,
> without LTO, we don't notice that an initialization is missing?
> 
> This is too speculative. The commit message should please include more
> details. I'd like to understand what code in edk2 is affected, what the
> specific warning is, what the problematic component in the toolchain is
> (i.e., what tool requires GIMPLE bytecode to be present in the object file).
> 
> Thanks,
> Laszlo
> 
> 
> 
> >
> > diff --git a/BaseTools/Conf/tools_def.template
> b/BaseTools/Conf/tools_def.template
> > index 498696e583..aad5297385 100755
> > --- a/BaseTools/Conf/tools_def.template
> > +++ b/BaseTools/Conf/tools_def.template
> > @@ -2315,10 +2315,10 @@ RELEASE_GCC49_AARCH64_DLINK_XIPFLAGS
> = -z common-page-size=0x20
> >  *_GCC5_IA32_OBJCOPY_FLAGS        =
> >  *_GCC5_IA32_NASM_FLAGS           = -f elf32
> >
> > -  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -flto -Os
> > +  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -ffat-lto-objects -flto -Os
> >    DEBUG_GCC5_IA32_DLINK_FLAGS    =
> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os
> -Wl,-m,elf_i386,--oformat=elf32-i386
> >
> > -RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -flto -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
> > +RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -ffat-lto-objects -flto -Os -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> >  RELEASE_GCC5_IA32_DLINK_FLAGS    =
> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os
> -Wl,-m,elf_i386,--oformat=elf32-i386
> >
> >    NOOPT_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> -O0
> > @@ -2347,10 +2347,10 @@ RELEASE_GCC5_IA32_DLINK_FLAGS    =
> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,
> >  *_GCC5_X64_OBJCOPY_FLAGS         =
> >  *_GCC5_X64_NASM_FLAGS            = -f elf64
> >
> > -  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -flto -DUSING_LTO -Os
> > +  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -ffat-lto-objects -flto -DUSING_LTO -Os
> >    DEBUG_GCC5_X64_DLINK_FLAGS     =
> DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
> >
> > -RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -flto -DUSING_LTO -Os -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> > +RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -ffat-lto-objects -flto -DUSING_LTO -Os -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> >  RELEASE_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS)
> -flto -Os
> >
> >    NOOPT_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> -O0
> > @@ -2382,10 +2382,10 @@ RELEASE_GCC5_X64_DLINK_FLAGS     =
> DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
> >  *_GCC5_ARM_VFRPP_FLAGS           = $(ARCHCC_FLAGS)
> $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
> >  *_GCC5_ARM_CC_XIPFLAGS           =
> DEF(GCC5_ARM_CC_XIPFLAGS)
> >
> > -  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> > +  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -ffat-lto-objects -flto -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> >    DEBUG_GCC5_ARM_DLINK_FLAGS     =
> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os
> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm
> -Wl,-plugin-opt=-pass-through=-llto-arm
> >
> > -RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> > +RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -ffat-lto-objects -flto -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> >  RELEASE_GCC5_ARM_DLINK_FLAGS     =
> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os
> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm
> -Wl,-plugin-opt=-pass-through=-llto-arm
> >
> >    NOOPT_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
> -O0
> > @@ -2416,11 +2416,11 @@ RELEASE_GCC5_ARM_DLINK_FLAGS     =
> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKS
> >  *_GCC5_AARCH64_VFRPP_FLAGS       = $(ARCHCC_FLAGS)
> $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
> >  *_GCC5_AARCH64_CC_XIPFLAGS       =
> DEF(GCC5_AARCH64_CC_XIPFLAGS)
> >
> > -  DEBUG_GCC5_AARCH64_CC_FLAGS    =
> DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> > +  DEBUG_GCC5_AARCH64_CC_FLAGS    =
> DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto
> -Wno-unused-but-set-variable -Wno-unused-const-variable
> >    DEBUG_GCC5_AARCH64_DLINK_FLAGS =
> DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os
> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64
> -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
> >    DEBUG_GCC5_AARCH64_DLINK_XIPFLAGS = -z
> common-page-size=0x20
> >
> > -RELEASE_GCC5_AARCH64_CC_FLAGS    =
> DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable
> -Wno-unused-const-variable
> > +RELEASE_GCC5_AARCH64_CC_FLAGS    =
> DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto
> -Wno-unused-but-set-variable -Wno-unused-const-variable
> >  RELEASE_GCC5_AARCH64_DLINK_FLAGS =
> DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os
> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64
> -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
> >  RELEASE_GCC5_AARCH64_DLINK_XIPFLAGS = -z
> common-page-size=0x20
> >
> >





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Re: 回复: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5 tool chain
Posted by Laszlo Ersek 2 years, 11 months ago 
On 05/20/21 04:37, gaoliming wrote:
> Laszlo:
>   Here is the discussion https://edk2.groups.io/g/devel/message/75299. 
>   Now, some uninitialized warning can't be detected on GCC5 tool chain, but can be detected on GCC49 tool chain.
>   Edk2 CI only covers GCC5 tool chain. So, the merged code may impact GCC49 build. 
>   I add this option to expose such uninitialized warning in GCC5 tool chain and increase GCC5 tool chain coverage. 
>   
>   And, this is gcc issue https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90844
>   
>   Yes. This change will expose some existing issues. I will include more detail in the commit message for this change.  

Great, thanks for the info.

Can you please include the reference

  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90844

in the commit message?

Acked-by: Laszlo Ersek <lersek@redhat.com>

Thanks!
Laszlo

> 
> Thanks
> Liming
>> -----邮件原件-----
>> 发件人: Laszlo Ersek <lersek@redhat.com>
>> 发送时间: 2021年5月19日 15:23
>> 收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
>> 抄送: Sergei Dmitrouk <sergei@posteo.net>; Bob Feng
>> <bob.c.feng@intel.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>
>> 主题: Re: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in
>> GCC5 tool chain
>>
>> Hi Liming,
>>
>> On 05/19/21 04:27, gaoliming wrote:
>>> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3403
>>>
>>> This option can trig the uninitialized warning when lto is enabled.
>>> The image size data is also collected for OVMF. There is no impact.
>>>
>>> Cc: Sergei Dmitrouk <sergei@posteo.net>
>>> Cc: Bob Feng <bob.c.feng@intel.com>
>>> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
>>> Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
>>> ---
>>>  BaseTools/Conf/tools_def.template | 16 ++++++++--------
>>>  1 file changed, 8 insertions(+), 8 deletions(-)
>>
>> I've now read the documentation on "-ffat-lto-objects", and I agree that
>> it should not affect the final module executable sizes.
>>
>> However, I don't understand how this option *helps*. You mention
>> "uninitialized warning". I find nothing related to that in the
>> documentation.
>>
>> According to the documentation, "fat" LTO objects include both object
>> code and intermediate language (GIMPLE) bytecode. Such objects can then
>> be linked with, or without, link-time (= interprocedural) optimization.
>> As I understand the documentation, "fat" LTO objects only make a
>> difference if there are parts of the toolchain that are themselves
>> unaware of LTO, and so need the GIMPLE bytecode to be present in the
>> object files.
>>
>> I *guess* that this is the situation that we have in edk2 -- is there
>> perhaps something in our toolchain(s) that does not "notice" LTO without
>> "fat" LTO objects, and therefore we fail to emit a warning? Because,
>> without LTO, we don't notice that an initialization is missing?
>>
>> This is too speculative. The commit message should please include more
>> details. I'd like to understand what code in edk2 is affected, what the
>> specific warning is, what the problematic component in the toolchain is
>> (i.e., what tool requires GIMPLE bytecode to be present in the object file).
>>
>> Thanks,
>> Laszlo
>>
>>
>>
>>>
>>> diff --git a/BaseTools/Conf/tools_def.template
>> b/BaseTools/Conf/tools_def.template
>>> index 498696e583..aad5297385 100755
>>> --- a/BaseTools/Conf/tools_def.template
>>> +++ b/BaseTools/Conf/tools_def.template
>>> @@ -2315,10 +2315,10 @@ RELEASE_GCC49_AARCH64_DLINK_XIPFLAGS
>> = -z common-page-size=0x20
>>>  *_GCC5_IA32_OBJCOPY_FLAGS        =
>>>  *_GCC5_IA32_NASM_FLAGS           = -f elf32
>>>
>>> -  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
>> -flto -Os
>>> +  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
>> -ffat-lto-objects -flto -Os
>>>    DEBUG_GCC5_IA32_DLINK_FLAGS    =
>> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os
>> -Wl,-m,elf_i386,--oformat=elf32-i386
>>>
>>> -RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
>> -flto -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
>>> +RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
>> -ffat-lto-objects -flto -Os -Wno-unused-but-set-variable
>> -Wno-unused-const-variable
>>>  RELEASE_GCC5_IA32_DLINK_FLAGS    =
>> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os
>> -Wl,-m,elf_i386,--oformat=elf32-i386
>>>
>>>    NOOPT_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
>> -O0
>>> @@ -2347,10 +2347,10 @@ RELEASE_GCC5_IA32_DLINK_FLAGS    =
>> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,
>>>  *_GCC5_X64_OBJCOPY_FLAGS         =
>>>  *_GCC5_X64_NASM_FLAGS            = -f elf64
>>>
>>> -  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
>> -flto -DUSING_LTO -Os
>>> +  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
>> -ffat-lto-objects -flto -DUSING_LTO -Os
>>>    DEBUG_GCC5_X64_DLINK_FLAGS     =
>> DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
>>>
>>> -RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
>> -flto -DUSING_LTO -Os -Wno-unused-but-set-variable
>> -Wno-unused-const-variable
>>> +RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
>> -ffat-lto-objects -flto -DUSING_LTO -Os -Wno-unused-but-set-variable
>> -Wno-unused-const-variable
>>>  RELEASE_GCC5_X64_DLINK_FLAGS     = DEF(GCC5_X64_DLINK_FLAGS)
>> -flto -Os
>>>
>>>    NOOPT_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
>> -O0
>>> @@ -2382,10 +2382,10 @@ RELEASE_GCC5_X64_DLINK_FLAGS     =
>> DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
>>>  *_GCC5_ARM_VFRPP_FLAGS           = $(ARCHCC_FLAGS)
>> $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
>>>  *_GCC5_ARM_CC_XIPFLAGS           =
>> DEF(GCC5_ARM_CC_XIPFLAGS)
>>>
>>> -  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
>> -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>>> +  DEBUG_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
>> -ffat-lto-objects -flto -Wno-unused-but-set-variable
>> -Wno-unused-const-variable
>>>    DEBUG_GCC5_ARM_DLINK_FLAGS     =
>> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os
>> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm
>> -Wl,-plugin-opt=-pass-through=-llto-arm
>>>
>>> -RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
>> -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
>>> +RELEASE_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
>> -ffat-lto-objects -flto -Wno-unused-but-set-variable
>> -Wno-unused-const-variable
>>>  RELEASE_GCC5_ARM_DLINK_FLAGS     =
>> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os
>> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm
>> -Wl,-plugin-opt=-pass-through=-llto-arm
>>>
>>>    NOOPT_GCC5_ARM_CC_FLAGS        = DEF(GCC5_ARM_CC_FLAGS)
>> -O0
>>> @@ -2416,11 +2416,11 @@ RELEASE_GCC5_ARM_DLINK_FLAGS     =
>> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKS
>>>  *_GCC5_AARCH64_VFRPP_FLAGS       = $(ARCHCC_FLAGS)
>> $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
>>>  *_GCC5_AARCH64_CC_XIPFLAGS       =
>> DEF(GCC5_AARCH64_CC_XIPFLAGS)
>>>
>>> -  DEBUG_GCC5_AARCH64_CC_FLAGS    =
>> DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable
>> -Wno-unused-const-variable
>>> +  DEBUG_GCC5_AARCH64_CC_FLAGS    =
>> DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto
>> -Wno-unused-but-set-variable -Wno-unused-const-variable
>>>    DEBUG_GCC5_AARCH64_DLINK_FLAGS =
>> DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os
>> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64
>> -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
>>>    DEBUG_GCC5_AARCH64_DLINK_XIPFLAGS = -z
>> common-page-size=0x20
>>>
>>> -RELEASE_GCC5_AARCH64_CC_FLAGS    =
>> DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable
>> -Wno-unused-const-variable
>>> +RELEASE_GCC5_AARCH64_CC_FLAGS    =
>> DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto
>> -Wno-unused-but-set-variable -Wno-unused-const-variable
>>>  RELEASE_GCC5_AARCH64_DLINK_FLAGS =
>> DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os
>> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64
>> -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
>>>  RELEASE_GCC5_AARCH64_DLINK_XIPFLAGS = -z
>> common-page-size=0x20
>>>
>>>
> 
> 
> 



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回复: 回复: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in GCC5 tool chain
Posted by gaoliming 2 years, 11 months ago 
Laszlo:
  Sure. I will include gcc issue link in the commit message. I will send V2 patch. 

Thanks
Liming
> -----邮件原件-----
> 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Laszlo Ersek
> 发送时间: 2021年5月20日 15:27
> 收件人: gaoliming <gaoliming@byosoft.com.cn>; devel@edk2.groups.io
> 抄送: 'Sergei Dmitrouk' <sergei@posteo.net>; 'Bob Feng'
> <bob.c.feng@intel.com>; 'Ard Biesheuvel' <ardb+tianocore@kernel.org>
> 主题: Re: 回复: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option
> in GCC5 tool chain
> 
> On 05/20/21 04:37, gaoliming wrote:
> > Laszlo:
> >   Here is the discussion https://edk2.groups.io/g/devel/message/75299.
> >   Now, some uninitialized warning can't be detected on GCC5 tool chain,
> but can be detected on GCC49 tool chain.
> >   Edk2 CI only covers GCC5 tool chain. So, the merged code may impact
> GCC49 build.
> >   I add this option to expose such uninitialized warning in GCC5 tool chain
> and increase GCC5 tool chain coverage.
> >
> >   And, this is gcc issue
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90844
> >
> >   Yes. This change will expose some existing issues. I will include more
> detail in the commit message for this change.
> 
> Great, thanks for the info.
> 
> Can you please include the reference
> 
>   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90844
> 
> in the commit message?
> 
> Acked-by: Laszlo Ersek <lersek@redhat.com>
> 
> Thanks!
> Laszlo
> 
> >
> > Thanks
> > Liming
> >> -----邮件原件-----
> >> 发件人: Laszlo Ersek <lersek@redhat.com>
> >> 发送时间: 2021年5月19日 15:23
> >> 收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
> >> 抄送: Sergei Dmitrouk <sergei@posteo.net>; Bob Feng
> >> <bob.c.feng@intel.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>
> >> 主题: Re: [edk2-devel] [PATCH] BaseTools: Add -ffat-lto-objects option in
> >> GCC5 tool chain
> >>
> >> Hi Liming,
> >>
> >> On 05/19/21 04:27, gaoliming wrote:
> >>> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3403
> >>>
> >>> This option can trig the uninitialized warning when lto is enabled.
> >>> The image size data is also collected for OVMF. There is no impact.
> >>>
> >>> Cc: Sergei Dmitrouk <sergei@posteo.net>
> >>> Cc: Bob Feng <bob.c.feng@intel.com>
> >>> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> >>> Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
> >>> ---
> >>>  BaseTools/Conf/tools_def.template | 16 ++++++++--------
> >>>  1 file changed, 8 insertions(+), 8 deletions(-)
> >>
> >> I've now read the documentation on "-ffat-lto-objects", and I agree that
> >> it should not affect the final module executable sizes.
> >>
> >> However, I don't understand how this option *helps*. You mention
> >> "uninitialized warning". I find nothing related to that in the
> >> documentation.
> >>
> >> According to the documentation, "fat" LTO objects include both object
> >> code and intermediate language (GIMPLE) bytecode. Such objects can then
> >> be linked with, or without, link-time (= interprocedural) optimization.
> >> As I understand the documentation, "fat" LTO objects only make a
> >> difference if there are parts of the toolchain that are themselves
> >> unaware of LTO, and so need the GIMPLE bytecode to be present in the
> >> object files.
> >>
> >> I *guess* that this is the situation that we have in edk2 -- is there
> >> perhaps something in our toolchain(s) that does not "notice" LTO without
> >> "fat" LTO objects, and therefore we fail to emit a warning? Because,
> >> without LTO, we don't notice that an initialization is missing?
> >>
> >> This is too speculative. The commit message should please include more
> >> details. I'd like to understand what code in edk2 is affected, what the
> >> specific warning is, what the problematic component in the toolchain is
> >> (i.e., what tool requires GIMPLE bytecode to be present in the object file).
> >>
> >> Thanks,
> >> Laszlo
> >>
> >>
> >>
> >>>
> >>> diff --git a/BaseTools/Conf/tools_def.template
> >> b/BaseTools/Conf/tools_def.template
> >>> index 498696e583..aad5297385 100755
> >>> --- a/BaseTools/Conf/tools_def.template
> >>> +++ b/BaseTools/Conf/tools_def.template
> >>> @@ -2315,10 +2315,10 @@
> RELEASE_GCC49_AARCH64_DLINK_XIPFLAGS
> >> = -z common-page-size=0x20
> >>>  *_GCC5_IA32_OBJCOPY_FLAGS        =
> >>>  *_GCC5_IA32_NASM_FLAGS           = -f elf32
> >>>
> >>> -  DEBUG_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> >> -flto -Os
> >>> +  DEBUG_GCC5_IA32_CC_FLAGS       =
> DEF(GCC5_IA32_CC_FLAGS)
> >> -ffat-lto-objects -flto -Os
> >>>    DEBUG_GCC5_IA32_DLINK_FLAGS    =
> >> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os
> >> -Wl,-m,elf_i386,--oformat=elf32-i386
> >>>
> >>> -RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> >> -flto -Os -Wno-unused-but-set-variable -Wno-unused-const-variable
> >>> +RELEASE_GCC5_IA32_CC_FLAGS       = DEF(GCC5_IA32_CC_FLAGS)
> >> -ffat-lto-objects -flto -Os -Wno-unused-but-set-variable
> >> -Wno-unused-const-variable
> >>>  RELEASE_GCC5_IA32_DLINK_FLAGS    =
> >> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os
> >> -Wl,-m,elf_i386,--oformat=elf32-i386
> >>>
> >>>    NOOPT_GCC5_IA32_CC_FLAGS       =
> DEF(GCC5_IA32_CC_FLAGS)
> >> -O0
> >>> @@ -2347,10 +2347,10 @@ RELEASE_GCC5_IA32_DLINK_FLAGS    =
> >> DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Os -Wl,
> >>>  *_GCC5_X64_OBJCOPY_FLAGS         =
> >>>  *_GCC5_X64_NASM_FLAGS            = -f elf64
> >>>
> >>> -  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> >> -flto -DUSING_LTO -Os
> >>> +  DEBUG_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> >> -ffat-lto-objects -flto -DUSING_LTO -Os
> >>>    DEBUG_GCC5_X64_DLINK_FLAGS     =
> >> DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
> >>>
> >>> -RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> >> -flto -DUSING_LTO -Os -Wno-unused-but-set-variable
> >> -Wno-unused-const-variable
> >>> +RELEASE_GCC5_X64_CC_FLAGS        = DEF(GCC5_X64_CC_FLAGS)
> >> -ffat-lto-objects -flto -DUSING_LTO -Os -Wno-unused-but-set-variable
> >> -Wno-unused-const-variable
> >>>  RELEASE_GCC5_X64_DLINK_FLAGS     =
> DEF(GCC5_X64_DLINK_FLAGS)
> >> -flto -Os
> >>>
> >>>    NOOPT_GCC5_X64_CC_FLAGS        =
> DEF(GCC5_X64_CC_FLAGS)
> >> -O0
> >>> @@ -2382,10 +2382,10 @@ RELEASE_GCC5_X64_DLINK_FLAGS     =
> >> DEF(GCC5_X64_DLINK_FLAGS) -flto -Os
> >>>  *_GCC5_ARM_VFRPP_FLAGS           = $(ARCHCC_FLAGS)
> >> $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
> >>>  *_GCC5_ARM_CC_XIPFLAGS           =
> >> DEF(GCC5_ARM_CC_XIPFLAGS)
> >>>
> >>> -  DEBUG_GCC5_ARM_CC_FLAGS        =
> DEF(GCC5_ARM_CC_FLAGS)
> >> -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> >>> +  DEBUG_GCC5_ARM_CC_FLAGS        =
> DEF(GCC5_ARM_CC_FLAGS)
> >> -ffat-lto-objects -flto -Wno-unused-but-set-variable
> >> -Wno-unused-const-variable
> >>>    DEBUG_GCC5_ARM_DLINK_FLAGS     =
> >> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os
> >> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm
> >> -Wl,-plugin-opt=-pass-through=-llto-arm
> >>>
> >>> -RELEASE_GCC5_ARM_CC_FLAGS        =
> DEF(GCC5_ARM_CC_FLAGS)
> >> -flto -Wno-unused-but-set-variable -Wno-unused-const-variable
> >>> +RELEASE_GCC5_ARM_CC_FLAGS        =
> DEF(GCC5_ARM_CC_FLAGS)
> >> -ffat-lto-objects -flto -Wno-unused-but-set-variable
> >> -Wno-unused-const-variable
> >>>  RELEASE_GCC5_ARM_DLINK_FLAGS     =
> >> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os
> >> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-arm
> >> -Wl,-plugin-opt=-pass-through=-llto-arm
> >>>
> >>>    NOOPT_GCC5_ARM_CC_FLAGS        =
> DEF(GCC5_ARM_CC_FLAGS)
> >> -O0
> >>> @@ -2416,11 +2416,11 @@ RELEASE_GCC5_ARM_DLINK_FLAGS     =
> >> DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKS
> >>>  *_GCC5_AARCH64_VFRPP_FLAGS       = $(ARCHCC_FLAGS)
> >> $(PLATFORM_FLAGS) DEF(GCC_VFRPP_FLAGS)
> >>>  *_GCC5_AARCH64_CC_XIPFLAGS       =
> >> DEF(GCC5_AARCH64_CC_XIPFLAGS)
> >>>
> >>> -  DEBUG_GCC5_AARCH64_CC_FLAGS    =
> >> DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable
> >> -Wno-unused-const-variable
> >>> +  DEBUG_GCC5_AARCH64_CC_FLAGS    =
> >> DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto
> >> -Wno-unused-but-set-variable -Wno-unused-const-variable
> >>>    DEBUG_GCC5_AARCH64_DLINK_FLAGS =
> >> DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os
> >> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64
> >> -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
> >>>    DEBUG_GCC5_AARCH64_DLINK_XIPFLAGS = -z
> >> common-page-size=0x20
> >>>
> >>> -RELEASE_GCC5_AARCH64_CC_FLAGS    =
> >> DEF(GCC5_AARCH64_CC_FLAGS) -flto -Wno-unused-but-set-variable
> >> -Wno-unused-const-variable
> >>> +RELEASE_GCC5_AARCH64_CC_FLAGS    =
> >> DEF(GCC5_AARCH64_CC_FLAGS) -ffat-lto-objects -flto
> >> -Wno-unused-but-set-variable -Wno-unused-const-variable
> >>>  RELEASE_GCC5_AARCH64_DLINK_FLAGS =
> >> DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os
> >> -L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64
> >> -Wl,-plugin-opt=-pass-through=-llto-aarch64 -Wno-lto-type-mismatch
> >>>  RELEASE_GCC5_AARCH64_DLINK_XIPFLAGS = -z
> >> common-page-size=0x20
> >>>
> >>>
> >
> >
> >
> 
> 
> 
> 
> 





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