[llvm-dev] [llvm-3.8-ec3] cmake-2.8.12 and gcc-4.6: Host compiler appears to require libatomic, but cannot find it.

[Sedat Dilek via llvm-dev]

On 3/2/16, Reid Kleckner <rnk at google.com> wrote:
> Hopefully r262491 improves the situation here. Now we do the GCC 4.7+ check
> earlier.
>

Thanks a lot.

But I am here on llvm.git - do you have the commit subject-line?

Thanks.

- Sedat -

> On Wed, Feb 24, 2016 at 10:17 PM, Sedat Dilek via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hi,
>>
>> when I switch to an unsupported GCC like v4.6.4 to build LLVM v3.8-rc3
>> with cmake I get the following:
>> ...
>> -- Looking for __atomic_fetch_add_4 in atomic
>> -- Looking for __atomic_fetch_add_4 in atomic - not found
>> CMake Error at cmake/modules/CheckAtomic.cmake:36 (message):
>>   Host compiler appears to require libatomic, but cannot find it.
>> Call Stack (most recent call first):
>>   cmake/config-ix.cmake:296 (include)
>>   CMakeLists.txt:407 (include)
>>
>>
>> -- Configuring incomplete, errors occurred!
>> See also
>> "/home/wearefam/src/llvm-toolchain/llvm-build/CMakeFiles/CMakeOutput.log".
>> See also
>> "/home/wearefam/src/llvm-toolchain/llvm-build/CMakeFiles/CMakeError.log".
>>
>> I would like to see something telling me my host-compiler is not
>> supported and I need a minimum version
>> ( My host-system is Ubuntu/precise AMD64. )
>>
>> See also "Host C++ Toolchain, both Compiler and Standard Library"...
>>
>> "For the most popular host toolchains we check for specific minimum
>> versions in our build systems:
>>
>> Clang 3.1
>> GCC 4.7
>> Visual Studio 2013"
>>
>> ...and "Getting a Modern Host C++ Toolchain" in [1].
>>
>> CMakeOutput.log and CMakeError.log are attached.
>>
>> Regards,
>> - Sedat -
>>
>> [1] http://llvm.org/docs/GettingStarted.html
>>
>> _______________________________________________
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>>
>>
>