llvm dev - Jan 2018 - CMake warning when compiling Clang/LLVM

Hi,

when I run cmake I get the following warning:

---------------------------------------------------------------------------------------
CMake Warning at cmake/modules/HandleLLVMStdlib.cmake:24 (message):
  Can't specify libc++ with '-stdlib='
Call Stack (most recent call first):
  cmake/config-ix.cmake:15 (include)
  CMakeLists.txt:580 (include)
---------------------------------------------------------------------------------------

I am using GCC 4.8.5 to build on a x86_64 machine with RedHat OS.

Any idea why?

Thanks.
Simone
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On 01/26/2018 12:32 PM, Simone Atzeni via llvm-dev
wrote:
> Hi,
> 
> when I run cmake I get the following warning:
> 
>
---------------------------------------------------------------------------------------
> CMake Warning at cmake/modules/HandleLLVMStdlib.cmake:24 (message):
>   Can't specify libc++ with '-stdlib='
> Call Stack (most recent call first):
>   cmake/config-ix.cmake:15 (include)
>   CMakeLists.txt:580 (include)
>
---------------------------------------------------------------------------------------
> 
> I am using GCC 4.8.5 to build on a x86_64 machine with RedHat OS.
> 
> Any idea why?
What arguments are you passing to CMake and which version of LLVM are you
trying to build?

-Tom
> 
> Thanks.
> Simone
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

Am 2018-01-26 21:36, schrieb Tom Stellard via llvm-dev:
> On 01/26/2018 12:32 PM, Simone Atzeni via llvm-dev wrote:
>> Hi,
>> 
>> when I run cmake I get the following warning:
>> 
>>
---------------------------------------------------------------------------------------
>> CMake Warning at cmake/modules/HandleLLVMStdlib.cmake:24 (message):
>>   Can't specify libc++ with '-stdlib='
>> Call Stack (most recent call first):
>>   cmake/config-ix.cmake:15 (include)
>>   CMakeLists.txt:580 (include)
>>
---------------------------------------------------------------------------------------
>> 
>> I am using GCC 4.8.5 to build on a x86_64 machine with RedHat OS.
>> 
>> Any idea why?
> 
> What arguments are you passing to CMake and which version of LLVM are 
> you
> trying to build?
That's probably -DLLVM_ENABLE_LIBCXX=ON and the warning tells you the 
reason: -stdlib= is only supported if compiling with Clang, you can't 
specify it with GCC.

Cheers,
Jonas

On 26.01.2018 21:32, Simone Atzeni via llvm-dev wrote:
> Hi,
>
> when I run cmake I get the following warning:
>
>
---------------------------------------------------------------------------------------
> CMake Warning at cmake/modules/HandleLLVMStdlib.cmake:24 (message):
>   Can't specify libc++ with '-stdlib='
> Call Stack (most recent call first):
>   cmake/config-ix.cmake:15 (include)
>   CMakeLists.txt:580 (include)
>
---------------------------------------------------------------------------------------
>
>
> I am using GCC 4.8.5 to build on a x86_64 machine with RedHat OS.
>
> Any idea why?
I had problems building the llvm libcxx libraries with gcc 5.3. I then 
used gcc 7 and my problems went away.
That doesn't answer your question, but might be helpful down the road. :)

Ciao
    Nat!

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