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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 will be used in all cases where kbuild does preprocessing including
building C files and assembler files. building C files and assembler files.
KCPPFLAGS_COMPAT
----------------
Additional options to pass to $(CC_COMPAT) when preprocessing C and assembler
files.
KAFLAGS KAFLAGS
------- -------
Additional options to the assembler (for built-in and modules). Additional options to the assembler (for built-in and modules).

4
arch/arm64/kernel/vdso32/Makefile
View File

@@ -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 += -shared --hash-style=sysv --build-id=sha1
VDSO_LDFLAGS += --orphan-handling=warn 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 # Borrow vdsomunge.c from the arm vDSO
# We have to use a relative path because scripts/Makefile.host prefixes # We have to use a relative path because scripts/Makefile.host prefixes