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ANDROID: arm64: vdso32: support user-supplied flags

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This introduces a new environment variable, KCPPFLAGS_COMPAT.

One use-case is to ensure -ffile-prefix-map is passed to the arm32
compiler to normalise compilation directory and make the ELF build ID
reproducible.

Bug: 345452375
Change-Id: I6ae1df58172f4dadeac1dbbee2e3241b704a9256
Signed-off-by: Giuliano Procida <gprocida@google.com>
This commit is contained in:
Giuliano Procida 2024-06-06 13:11:36 +01:00
parent ac9706483e
commit ec795e4eaa
2 changed files with 9 additions and 0 deletions
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5
Documentation/kbuild/kbuild.rst
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@ -32,6 +32,11 @@ Additional options to pass when preprocessing. The preprocessing options
will be used in all cases where kbuild does preprocessing including
building C files and assembler files.
KCPPFLAGS_COMPAT
----------------
Additional options to pass to $(CC_COMPAT) when preprocessing C and assembler
files.
KAFLAGS
-------
Additional options to the assembler (for built-in and modules).

4
arch/arm64/kernel/vdso32/Makefile
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@ -106,6 +106,10 @@ VDSO_LDFLAGS += -z max-page-size=4096 -z common-page-size=4096
VDSO_LDFLAGS += -shared --hash-style=sysv --build-id=sha1
VDSO_LDFLAGS += --orphan-handling=warn
# Add user-supplied KCPPFLAGS_COMPAT as the last assignments
VDSO_CFLAGS += $(KCPPFLAGS_COMPAT)
VDSO_AFLAGS += $(KCPPFLAGS_COMPAT)
# Borrow vdsomunge.c from the arm vDSO
# We have to use a relative path because scripts/Makefile.host prefixes