clang 11rc1 - target aarch64 -mharden-sls warning

Good day.
I am testing a compilation of clang ver. 11rc1 using the
clang-11.0.0rc1 compiler.

CFLAGS and CXXFLAGS I have set "-march=armv8-a -mharden-sls=all -pipe"

When compiling, I get a message:
clang-11: warning: argument unused during compilation: -mharden-sls=all

Is this warning caused by my incorrect settings or there is an error in the code

Best regards

Milan

Hi Milan,

just to be sure:

Are you doing a multi-stage build? On which stage is the warning emitted?
The architecture you are building on itself is ARM or are you doing
cross compilation?

The argument itself is a compatibility-option for GCC, which might be
added after clang-11 was branched?
(https://github.com/llvm/llvm-project/commit/0ee176edc8b4a6f20527e907bfd026b07a27e7ef
seems to have it included though!)

The generic warning message is emitted when that specified option is not
utilized because it does not apply in this instance.
For example, I have seen this when compiling C code with C++-specific
arguments.

So your specific setup would be relevant to know.

Best Regards
Jonas

Hi Jonas

I built Clang in the native aarch64 environment on a Jetson TX2 device.
I didn't use bootstrap.

My procedure:
- compile clang using gcc compiler using
   CFLAGS and CXXFLAGS = "-march = armv8-a -mharden-sls = all -pipe"
   CC=gcc CXX=g ++

- installation of clang into the system

- recompiling clang using the clang compiler using
   CFLAGS and CXXFLAGS = "-march = armv8-a -mharden-sls = all -pipe"
   CC=clang CXX=clang ++

I'm getting an error message during this step.

Build configuration used:

cmake .. -G Ninja \
               -DCMAKE_BUILD_TYPE = Release \
               -DCMAKE_INSTALL_PREFIX = / usr \
               -DCLANG_INCLUDE_TEST = OFF \
               -DCLANG_PLUGIN_SUPPORT = ON \
               -DCLANG_VENDOR = "SAUX Aarch64" \
               -Wno-dev

I'll wait until clang v. 11.0.0 is released.
Then I'll try again.

Best regards
Milan

po 3. 8. 2020 v 12:05 odesílatel Jonas Toth <development@jonas-toth.eu> napsal: