[cfe-users] clang 11rc1 - target aarch64 -mharden-sls warning

[Milan Buška via cfe-users]

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 at jonas-toth.eu> napsal:
>
> 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
>
> Am 01.08.20 um 13:22 schrieb Milan Buška via cfe-users:
> > 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



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