selftests: arm64: za-fork.c build failed with clang-16 due to below
warnings / errors on Linux next-20230725.
Build failed for:
- selftests: arm64: za-fork
- selftests: arm64: za-ptrace
Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
clang --target=aarch64-linux-gnu -fintegrated-as
-Werror=unknown-warning-option -Werror=ignored-optimization-argument
-Werror=option-ignored -Werror=unused-command-line-argument
--target=aarch64-linux-gnu -fintegrated-as
-fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib \
-include ../../../../include/nolibc/nolibc.h -I../..\
-static -ffreestanding -Wall za-fork.c
/home/tuxbuild/.cache/tuxmake/builds/1/build/kselftest/arm64/fp/za-fork-asm.o
-o /home/tuxbuild/.cache/tuxmake/builds/1/build/kselftest/arm64/fp/za-fork
In file included from <built-in>:1:
In file included from ./../../../../include/nolibc/nolibc.h:97:
In file included from ./../../../../include/nolibc/arch.h:25:
./../../../../include/nolibc/arch-aarch64.h:178:35: warning: unknown
attribute 'optimize' ignored [-Wunknown-attributes]
void __attribute__((weak,noreturn,optimize("omit-frame-pointer")))
__no_stack_protector _start(void)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from za-fork.c:12:
../../kselftest.h:123:2: error: call to undeclared function 'setvbuf';
ISO C99 and later do not support implicit function declarations
[-Wimplicit-function-declaration]
setvbuf(stdout, NULL, _IOLBF, 0);
^
../../kselftest.h:123:24: error: use of undeclared identifier '_IOLBF'
setvbuf(stdout, NULL, _IOLBF, 0);
^
1 warning and 2 errors generated.
make[5]: Leaving directory '/builds/linux/tools/testing/selftests/arm64/fp'
Links:
- https://storage.tuxsuite.com/public/linaro/lkft/builds/2T3676HpK243gMBLYJCp4OXDmWl/build.log
- https://storage.tuxsuite.com/public/linaro/lkft/builds/2T3676HpK243gMBLYJCp4OXDmWl/
steps to reproduce:
---
# tuxmake \
--runtime podman \
--target-arch arm64 \
--toolchain clang-16 \
--kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2T3676HpK243gMBLYJCp4OXDmWl/config
LLVM=1 LLVM_IAS=1 dtbs dtbs-legacy headers kernel kselftest modules
--
Linaro LKFT
https://lkft.linaro.org
