Re: [PATCH v3 9/9] selftests/sgx: Specify freestanding environment for enclave compilation

[Jarkko Sakkinen]

On Sat Aug 19, 2023 at 12:43 PM EEST, Jo Van Bulck wrote:
> 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.
>
> Signed-off-by: Jo Van Bulck <jo.vanbulck@xxxxxxxxxxxxxx>
> ---
>  tools/testing/selftests/sgx/Makefile | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/sgx/Makefile b/tools/testing/selftests/sgx/Makefile
> index 2de970f72..19a07e890 100644
> --- a/tools/testing/selftests/sgx/Makefile
> +++ b/tools/testing/selftests/sgx/Makefile
> @@ -14,8 +14,8 @@ endif
>  INCLUDES := -I$(top_srcdir)/tools/include
>  HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC
>  HOST_LDFLAGS := -z noexecstack -lcrypto
> -ENCL_CFLAGS := -Wall -Werror -static-pie -nostdlib -nostartfiles -fPIE \
> -	       -fno-stack-protector -mrdrnd $(INCLUDES)
> +ENCL_CFLAGS := -Wall -Werror -static-pie -nostdlib -ffreestanding -fPIE \
> +		-nostartfiles -fno-stack-protector -mrdrnd $(INCLUDES)
>  ENCL_LDFLAGS := -Wl,-T,test_encl.lds,--build-id=none
>  
>  TEST_CUSTOM_PROGS := $(OUTPUT)/test_sgx
> -- 
> 2.25.1

Do you still need nostdfiles and nostartfiles with freestanding?

BR, Jarkko