From c297aa7d3fb6755890b78b483e82c9cf07370d50 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Mon, 11 Nov 2024 18:32:58 +0000 Subject: [PATCH] kselftest/arm64: Enable build of PAC tests with LLVM=1 Currently we don't build the PAC selftests when building with LLVM=1 since we attempt to test for PAC support in the toolchain before we've set up the build system to point at LLVM in lib.mk, which has to be one of the last things in the Makefile. Since all versions of LLVM supported for use with the kernel have PAC support we can just sidestep the issue by just assuming PAC is there when doing a LLVM=1 build. Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20241111-arm64-selftest-pac-clang-v1-1-08599ceee418@kernel.org Signed-off-by: Catalin Marinas --- tools/testing/selftests/arm64/pauth/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/arm64/pauth/Makefile b/tools/testing/selftests/arm64/pauth/Makefile index 72e290b0b10c1..b5a1c80e0ead6 100644 --- a/tools/testing/selftests/arm64/pauth/Makefile +++ b/tools/testing/selftests/arm64/pauth/Makefile @@ -7,8 +7,14 @@ CC := $(CROSS_COMPILE)gcc endif CFLAGS += -mbranch-protection=pac-ret + +# All supported LLVMs have PAC, test for GCC +ifeq ($(LLVM),1) +pauth_cc_support := 1 +else # check if the compiler supports ARMv8.3 and branch protection with PAuth pauth_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.3-a -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi) +endif ifeq ($(pauth_cc_support),1) TEST_GEN_PROGS := pac -- 2.39.5