[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, Sedat Dilek <sedat.dilek at gmail.com> wrote:
> 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?
>

OK, found it.

commit 06ff4ba325c279c737ff9628f88379313b620d7f
"[cmake] Check the compiler version first"

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262491
91177308-0d34-0410-b5e6-96231b3b80d8

- Sedat -

[1] https://github.com/llvm-mirror/llvm/commit/06ff4ba325c279c737ff9628f88379313b620d7f

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