Use -ffreestanding to assert the enclave compilation targets a freestanding environment (i.e., without "main" or standard libraries). This fixes clang reporting "undefined reference to `memset'" after erroneously optimizing away the provided memset/memcpy implementations. Still need to instruct the linker from using standard system startup functions, but drop -nostartfiles as it is implied by -nostdlib. Signed-off-by: Jo Van Bulck <jo.vanbulck@xxxxxxxxxxxxxx> Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx> --- tools/testing/selftests/sgx/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/sgx/Makefile b/tools/testing/selftests/sgx/Makefile index dcdd04b322f8..7eb890bdd3f0 100644 --- a/tools/testing/selftests/sgx/Makefile +++ b/tools/testing/selftests/sgx/Makefile @@ -14,7 +14,7 @@ endif INCLUDES := -I$(top_srcdir)/tools/include HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC HOST_LDFLAGS := -z noexecstack -lcrypto -ENCL_CFLAGS += -Wall -Werror -static -nostdlib -nostartfiles -fPIC \ +ENCL_CFLAGS += -Wall -Werror -static -nostdlib -ffreestanding -fPIC \ -fno-stack-protector -mrdrnd $(INCLUDES) ENCL_LDFLAGS := -Wl,-T,test_encl.lds,--build-id=none -- 2.25.1
