From: Tor Vic torvic9@mailbox.org
commit 0236526d76b87c1dc2cbe3eb31ae29be5b0ca151 upstream.
Since LLVM commit fc018eb, the '-warn-stack-size' flag has been dropped [1], leading to the following error message when building with Clang-13 and LLD-13:
ld.lld: error: -plugin-opt=-: ld.lld: Unknown command line argument '-warn-stack-size=2048'. Try: 'ld.lld --help' ld.lld: Did you mean '--asan-stack=2048'?
In the same way as with commit 2398ce80152a ("x86, lto: Pass -stack-alignment only on LLD < 13.0.0") , make '-warn-stack-size' conditional on LLD < 13.0.0.
[1] https://reviews.llvm.org/D103928
Fixes: 24845dcb170e ("Makefile: LTO: have linker check -Wframe-larger-than") Cc: stable@vger.kernel.org Link: https://github.com/ClangBuiltLinux/linux/issues/1377 Signed-off-by: Tor Vic torvic9@mailbox.org Reviewed-by: Nathan Chancellor nathan@kernel.org Reviewed-by: Nick Desaulniers ndesaulniers@google.com Signed-off-by: Kees Cook keescook@chromium.org Link: https://lore.kernel.org/r/7631bab7-a8ab-f884-ab54-f4198976125c@mailbox.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Makefile | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/Makefile +++ b/Makefile @@ -913,11 +913,14 @@ CC_FLAGS_LTO += -fvisibility=hidden # Limit inlining across translation units to reduce binary size KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
-# Check for frame size exceeding threshold during prolog/epilog insertion. +# Check for frame size exceeding threshold during prolog/epilog insertion +# when using lld < 13.0.0. ifneq ($(CONFIG_FRAME_WARN),0) +ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) endif endif +endif
ifdef CONFIG_LTO KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)