This import several files from Linux v5.3
 - scripts/Kconfig.include
 - scripts/clang-version.sh
 - scripts/gcc-version.sh
 and several config values from from Linux's init/Kconfig file.

Files are copied into scripts/ directory because that's were the files
are found in Linux tree, and also because we are going to import more
of Kbuild from Linux which is located in scripts/.

CONFIG_GCC_VERSION and CONFIG_CC_IS_CLANG are going to be use in
follow-up patches.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 xen/Kconfig                  | 17 ++++++++++++++++
 xen/Makefile                 |  1 +
 xen/scripts/Kconfig.include  | 39 ++++++++++++++++++++++++++++++++++++
 xen/scripts/clang-version.sh | 19 ++++++++++++++++++
 xen/scripts/gcc-version.sh   | 20 ++++++++++++++++++
 5 files changed, 96 insertions(+)
 create mode 100644 xen/scripts/Kconfig.include
 create mode 100755 xen/scripts/clang-version.sh
 create mode 100755 xen/scripts/gcc-version.sh

diff --git a/xen/Kconfig b/xen/Kconfig
index 01067326b4e7..9f6512d65b08 100644
--- a/xen/Kconfig
+++ b/xen/Kconfig
@@ -4,9 +4,26 @@
 #
 mainmenu "Xen/$(SRCARCH) $(XEN_FULLVERSION) Configuration"
 
+source "scripts/Kconfig.include"
+
 config BROKEN
 	bool
 
+config CC_IS_GCC
+	def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
+
+config GCC_VERSION
+	int
+	default $(shell,$(BASEDIR)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC
+	default 0
+
+config CC_IS_CLANG
+	def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
+
+config CLANG_VERSION
+	int
+	default $(shell,$(BASEDIR)/scripts/clang-version.sh $(CC))
+
 source "arch/$(SRCARCH)/Kconfig"
 
 config DEFCONFIG_LIST
diff --git a/xen/Makefile b/xen/Makefile
index efbe9605e52b..0cf4ded9d9d4 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -267,6 +267,7 @@ $(foreach base,arch/x86/mm/guest_walk_% \
                arch/x86/mm/shadow/guest_%, \
     $(foreach ext,o i s,$(call build-intermediate,$(base).$(ext))))
 
+export CC LD
 kconfig := oldconfig config menuconfig defconfig \
 	nconfig xconfig gconfig savedefconfig listnewconfig olddefconfig \
 	randconfig $(notdir $(wildcard arch/$(SRCARCH)/configs/*_defconfig))
diff --git a/xen/scripts/Kconfig.include b/xen/scripts/Kconfig.include
new file mode 100644
index 000000000000..8221095ca34b
--- /dev/null
+++ b/xen/scripts/Kconfig.include
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Kconfig helper macros
+
+# Convenient variables
+comma       := ,
+quote       := "
+squote      := '
+empty       :=
+space       := $(empty) $(empty)
+dollar      := $
+right_paren := )
+left_paren  := (
+
+# $(if-success,<command>,<then>,<else>)
+# Return <then> if <command> exits with 0, <else> otherwise.
+if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
+
+# $(success,<command>)
+# Return y if <command> exits with 0, n otherwise
+success = $(if-success,$(1),y,n)
+
+# $(failure,<command>)
+# Return n if <command> exits with 0, y otherwise
+failure = $(if-success,$(1),n,y)
+
+# $(cc-option,<flag>)
+# Return y if the compiler supports <flag>, n otherwise
+cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -E -x c /dev/null -o /dev/null)
+
+# $(ld-option,<flag>)
+# Return y if the linker supports <flag>, n otherwise
+ld-option = $(success,$(LD) -v $(1))
+
+# check if $(CC) and $(LD) exist
+$(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
+$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
+
+# gcc version including patch level
+gcc-version := $(shell,$(BASEDIR)/scripts/gcc-version.sh $(CC))
diff --git a/xen/scripts/clang-version.sh b/xen/scripts/clang-version.sh
new file mode 100755
index 000000000000..6fabf0695761
--- /dev/null
+++ b/xen/scripts/clang-version.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# clang-version clang-command
+#
+# Print the compiler version of `clang-command' in a 5 or 6-digit form
+# such as `50001' for clang-5.0.1 etc.
+
+compiler="$*"
+
+if ! ( $compiler --version | grep -q clang) ; then
+	echo 0
+	exit 1
+fi
+
+MAJOR=$(echo __clang_major__ | $compiler -E -x c - | tail -n 1)
+MINOR=$(echo __clang_minor__ | $compiler -E -x c - | tail -n 1)
+PATCHLEVEL=$(echo __clang_patchlevel__ | $compiler -E -x c - | tail -n 1)
+printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
diff --git a/xen/scripts/gcc-version.sh b/xen/scripts/gcc-version.sh
new file mode 100755
index 000000000000..ae353432539b
--- /dev/null
+++ b/xen/scripts/gcc-version.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# gcc-version gcc-command
+#
+# Print the gcc version of `gcc-command' in a 5 or 6-digit form
+# such as `29503' for gcc-2.95.3, `30301' for gcc-3.3.1, etc.
+
+compiler="$*"
+
+if [ ${#compiler} -eq 0 ]; then
+	echo "Error: No compiler specified." >&2
+	printf "Usage:\n\t$0 <gcc-command>\n" >&2
+	exit 1
+fi
+
+MAJOR=$(echo __GNUC__ | $compiler -E -x c - | tail -n 1)
+MINOR=$(echo __GNUC_MINOR__ | $compiler -E -x c - | tail -n 1)
+PATCHLEVEL=$(echo __GNUC_PATCHLEVEL__ | $compiler -E -x c - | tail -n 1)
+printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
-- 
Anthony PERARD


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On 12/12/2019 18:27, Anthony PERARD wrote:
> diff --git a/xen/Makefile b/xen/Makefile
> index efbe9605e52b..0cf4ded9d9d4 100644
> --- a/xen/Makefile
> +++ b/xen/Makefile
> @@ -267,6 +267,7 @@ $(foreach base,arch/x86/mm/guest_walk_% \
>                 arch/x86/mm/shadow/guest_%, \
>      $(foreach ext,o i s,$(call build-intermediate,$(base).$(ext))))
>  
> +export CC LD

This probably wants to be higher up the file, where we export all the
other variables.  Perhaps also include CXX.

Otherwise, Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

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On Thu, Dec 12, 2019 at 06:56:00PM +0000, Andrew Cooper wrote:
> On 12/12/2019 18:27, Anthony PERARD wrote:
> > diff --git a/xen/Makefile b/xen/Makefile
> > index efbe9605e52b..0cf4ded9d9d4 100644
> > --- a/xen/Makefile
> > +++ b/xen/Makefile
> > @@ -267,6 +267,7 @@ $(foreach base,arch/x86/mm/guest_walk_% \
> >                 arch/x86/mm/shadow/guest_%, \
> >      $(foreach ext,o i s,$(call build-intermediate,$(base).$(ext))))
> >  
> > +export CC LD
> 
> This probably wants to be higher up the file, where we export all the
> other variables.  Perhaps also include CXX.

I'll move that to just after "export PYTHON". (Or maybe it should be
after we include Config.mk? But it probably doesn't matter where it is.)

> Otherwise, Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

Thanks,

-- 
Anthony PERARD

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