[xen staging-4.21] xen: add non-executable stack note uniformly

[patchbot@xxxxxxx]

commit a7380f14379ba79eaf43852b5555ed53a35da9e4
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Mar 4 14:48:39 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Mar 4 14:48:39 2026 +0100

    xen: add non-executable stack note uniformly
    
    Currently the -Wa,--noexecstack parameter is only passed to the compiler
    when building assembly files, as the assembler doesn't add such note for
    stack attributes.
    
    However, the default addition of the .note.GNU-stack section is dependent
    on the ELF target used.  Adjust the passing of -Wa,--noexecstack so it's
    added to CFLAGS instead of AFLAGS, and hence such section is also added to
    object files generated from .c sources.  This fixes the complains from the
    linker about missing .note.GNU-stack section when building x86-64 Xen on
    Darwin platforms.
    
    Note we could instead pass `-z noexecstack` to the linker, but that however
    would mask any possible errors or unintended mismatches from previous
    steps.
    
    Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 3dfd77003c28ff3f6bfbf76a75d40a41ccecb33f
    master date: 2026-02-13 16:42:42 +0100
---
 xen/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/Makefile b/xen/Makefile
index 9ed5853020..1a54194a1e 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -415,7 +415,7 @@ endif
 
 AFLAGS += -D__ASSEMBLY__
 
-$(call cc-option-add,AFLAGS,CC,-Wa$$(comma)--noexecstack)
+$(call cc-option-add,CFLAGS,CC,-Wa$$(comma)--noexecstack)
 
 LDFLAGS-$(call ld-option,--warn-rwx-segments) += --no-warn-rwx-segments
 
--
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