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selftests/openat2: fix clang build failures: -static-libasan, LOCAL_HDRS

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When building with clang via:

    make LLVM=1 -C tools/testing/selftests

two distinct failures occur:

1) gcc requires -static-libasan in order to ensure that Address
Sanitizer's library is the first one loaded. However, this leads to
build failures on clang, when building via:

       make LLVM=1 -C tools/testing/selftests

However, clang already does the right thing by default: it statically
links the Address Sanitizer if -fsanitize is specified. Therefore, fix
this by simply omitting -static-libasan for clang builds. And leave
behind a comment, because the whole reason for static linking might not
be obvious.

2) clang won't accept invocations of this form, but gcc will:

    $(CC) file1.c header2.h

Fix this by using selftests/lib.mk facilities for tracking local header
file dependencies: add them to LOCAL_HDRS, leaving only the .c files to
be passed to the compiler.

Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
John Hubbard 2024-05-31 18:45:33 -07:00 committed by Shuah Khan
parent 04e1f99afe
commit 442b15a2d7
1 changed files with 12 additions and 2 deletions
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14
tools/testing/selftests/openat2/Makefile
View file

@ -1,8 +1,18 @@
# SPDX-License-Identifier: GPL-2.0-or-later
CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined -static-libasan
CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined
TEST_GEN_PROGS := openat2_test resolve_test rename_attack_test
# gcc requires -static-libasan in order to ensure that Address Sanitizer's
# library is the first one loaded. However, clang already statically links the
# Address Sanitizer if -fsanitize is specified. Therefore, simply omit
# -static-libasan for clang builds.
ifeq ($(LLVM),)
CFLAGS += -static-libasan
endif
LOCAL_HDRS += helpers.h
include ../lib.mk
$(TEST_GEN_PROGS): helpers.c helpers.h
$(TEST_GEN_PROGS): helpers.c