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

[Reid Kleckner via llvm-dev]

Hopefully r262491 improves the situation here. Now we do the GCC 4.7+ check
earlier.

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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> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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