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    SubjectRe: [PATCH v4 09/13] selftests/sgx: Specify freestanding environment for enclave compilation
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    On Fri Aug 25, 2023 at 4:32 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.
    >
    > 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@cs.kuleuven.be>
    > ---
    > 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 2de970f7237c..f96667bdf9f2 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 \
    > + -fno-stack-protector -mrdrnd $(INCLUDES)
    > ENCL_LDFLAGS := -Wl,-T,test_encl.lds,--build-id=none
    >
    > TEST_CUSTOM_PROGS := $(OUTPUT)/test_sgx
    > --
    > 2.25.1

    Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>

    BR, Jarkko

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