[Xen-changelog] [xen staging] x86: cover for clang's lack of support of -mpreferred-stack-boundary=<N>

[patchbot@xxxxxxx]

commit 76d8dd2705a091078c871dff2024953749606dd0
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri May 17 17:32:20 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri May 17 17:32:20 2019 +0200

    x86: cover for clang's lack of support of -mpreferred-stack-boundary=<N>
    
    While clang supposedly supports -mstack-alignment=<N> instead, I'm not
    using that alternative here due to being uncertain whether that's indeed
    an exact equivalent of the gcc option. Only make use of the option
    entirely conditional for now.
    
    Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/efi/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/efi/Makefile b/xen/arch/x86/efi/Makefile
index f223ef058e..4bc0a196e9 100644
--- a/xen/arch/x86/efi/Makefile
+++ b/xen/arch/x86/efi/Makefile
@@ -7,7 +7,8 @@ boot.init.o: buildid.o
 
 EFIOBJ := boot.init.o compat.o runtime.o
 
-$(EFIOBJ): CFLAGS-stack-boundary := -mpreferred-stack-boundary=4
+$(call cc-option-add,cflags-stack-boundary,CC,-mpreferred-stack-boundary=4)
+$(EFIOBJ): CFLAGS-stack-boundary := $(cflags-stack-boundary)
 
 obj-y := stub.o
 obj-$(XEN_BUILD_EFI) := $(EFIOBJ) relocs-dummy.o
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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