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[Xen-devel] [PATCH Makefile v2] asm: handle comments when creating header file

From: Norbert Manthey <nmanthey@xxxxxxxxxx>

In the early steps of compilation, the asm header files are created, such
as include/asm-$(TARGET_ARCH)/asm-offsets.h. These files depend on the
assembly file arch/$(TARGET_ARCH)/asm-offsets.s, which is generated
before. Depending on the used toolchain, there might be comments in the
assembly files. Especially the goto-gcc compiler of the bounded model
checker CBMC adds comments that start with a '#' symbol at the beginning
of the line.

This commit adds handling comments in assembler during the creation of the
asm header files, especially ignoring lines that start with '#', which
indicate comments for both ARM and x86 assembler. The used tool goto-as
produces exactly comments of this kind.

Signed-off-by: Norbert Manthey <nmanthey@xxxxxxxxx>
Signed-off-by: Michael Tautschnig <tautschn@xxxxxxxxxxxx>
 xen/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/Makefile b/xen/Makefile
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -191,7 +191,7 @@ include/asm-$(TARGET_ARCH)/asm-offsets.h: 
          echo "#ifndef __ASM_OFFSETS_H__"; \
          echo "#define __ASM_OFFSETS_H__"; \
          echo ""; \
-         sed -rne "/==>/{s:.*==>(.*)<==.*:\1:; s: [\$$#]: :; p;}"; \
+         sed -rne "/^[^#].*==>/{s:.*==>(.*)<==.*:\1:; s: [\$$#]: :; p;}"; \
          echo ""; \
          echo "#endif") <$< >$@

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