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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Wei Liu , Jason Andryuk , Andrew Cooper , Stefan Bader , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Ubuntu gcc-9 enables -fcf-protection by default, which conflicts with -mindirect-branch=3Dextern and prevents building the hypervisor with CONFIG_INDIRECT_THUNK: xmalloc.h:81:1: error: =E2=80=98-mindirect-branch=E2=80=99 and =E2=80=98-fc= f-protection=E2=80=99 are not compatible Detect this incompatible combination, and add -fcf-protection=3Dnone to allow the build to succeed. To actually generated the error, the compiled program must include a function. CC: Stefan Bader Signed-off-by: Jason Andryuk --- xen/arch/x86/arch.mk | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/arch.mk b/xen/arch/x86/arch.mk index 2a51553edb..3aa6ce521a 100644 --- a/xen/arch/x86/arch.mk +++ b/xen/arch/x86/arch.mk @@ -63,7 +63,16 @@ CFLAGS +=3D -mno-red-zone -fpic -fno-asynchronous-unwind= -tables CFLAGS +=3D -mno-sse $(call cc-option,$(CC),-mskip-rax-setup) =20 # Compile with thunk-extern, indirect-branch-register if avaiable. -CFLAGS-$(CONFIG_INDIRECT_THUNK) +=3D -mindirect-branch=3Dthunk-extern +# Some versions of gcc error: "=E2=80=98-mindirect-branch=E2=80=99 and =E2= =80=98-fcf-protection=E2=80=99 are +# not compatible". For those, we need to disable cf-protection with +# -fcf-protection=3Dnone +cc-mindirect-branch =3D $(shell if test -n "`echo 'void foo(void) {};' | \ + LANG=3DC $(CC) -mindirect-branch=3Dthunk-extern -S -o /dev/null -x c= - 2>&1 | \ + grep -- '-mindirect-branch.*-fcf-protection.*are not compatible' -`"= ; \ + then echo "-mindirect-branch=3Dthunk-extern -fcf-protection=3Dnone"; \ + else echo "-mindirect-branch=3Dthunk-extern"; fi ;) + +CFLAGS-$(CONFIG_INDIRECT_THUNK) +=3D $(call cc-mindirect-branch) CFLAGS-$(CONFIG_INDIRECT_THUNK) +=3D -mindirect-branch-register CFLAGS-$(CONFIG_INDIRECT_THUNK) +=3D -fno-jump-tables =20 --=20 2.25.1