Unconditionally add -fno-stack-protector to KCOV's compiler options, as all supported compilers support the option. This saves a compiler invocation to determine if the option is supported.
Because Clang does not support -fno-conserve-stack, and -fno-stack-protector was wrapped in the same cc-option, we were missing -fno-stack-protector with Clang. Unconditionally adding this option fixes this for Clang. Suggested-by: Nick Desaulniers <[email protected]> Reviewed-by: Nick Desaulniers <[email protected]> Signed-off-by: Marco Elver <[email protected]> --- Split out from series: https://lkml.kernel.org/r/[email protected] as there is no dependency on the preceding patch (which will be dropped). --- kernel/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/Makefile b/kernel/Makefile index f3218bc5ec69..592cb549dcb8 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -35,7 +35,7 @@ KCOV_INSTRUMENT_stacktrace.o := n KCOV_INSTRUMENT_kcov.o := n KASAN_SANITIZE_kcov.o := n KCSAN_SANITIZE_kcov.o := n -CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector) +CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack) -fno-stack-protector # cond_syscall is currently not LTO compatible CFLAGS_sys_ni.o = $(DISABLE_LTO) -- 2.27.0.290.gba653c62da-goog
