Compiler error on SSE intrinsics with GCC 32-bit

[stgatilov]

Tried to build OpenAL 1.21.1 with gcc 5.4.0 for x86/32-bit, using Linux x86/64-bit.
To be honest, can't say for sure how exactly 32-bit option is set: I pass -s arch=x86 to conan build. If it is important, I can look it up.

I get compile errors due to SSE intrinsics. The errors look pretty weird to me:

In file included from /home/user/tdm/conan_cache/.conan/data/openal/1.21.1/thedarkmod/local/build/582f54fdf8e290e24a7424ad8faa5117ae0c0387/source_subfolder/alc/alcmain.h:22:0,
                 from /home/user/tdm/conan_cache/.conan/data/openal/1.21.1/thedarkmod/local/build/582f54fdf8e290e24a7424ad8faa5117ae0c0387/source_subfolder/alc/alu.cpp:47:
/home/user/tdm/conan_cache/.conan/data/openal/1.21.1/thedarkmod/local/build/582f54fdf8e290e24a7424ad8faa5117ae0c0387/source_subfolder/common/alnumeric.h: In function ‘int float2int(float)’:
/home/user/tdm/conan_cache/.conan/data/openal/1.21.1/thedarkmod/local/build/582f54fdf8e290e24a7424ad8faa5117ae0c0387/source_subfolder/common/alnumeric.h:146:26: warning: SSE vector return without SSE enabled changes the ABI [-Wpsabi]
     return _mm_cvtt_ss2si(_mm_set_ss(f));
                          ^
In file included from /usr/lib/gcc/x86_64-linux-gnu/5/include/x86intrin.h:31:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/32/bits/opt_random.h:33,
                 from /usr/include/c++/5/random:50,
                 from /usr/include/c++/5/bits/stl_algo.h:66,
                 from /usr/include/c++/5/algorithm:62,
                 from /home/user/tdm/conan_cache/.conan/data/openal/1.21.1/thedarkmod/local/build/582f54fdf8e290e24a7424ad8faa5117ae0c0387/source_subfolder/alc/alu.cpp:25:
/usr/lib/gcc/x86_64-linux-gnu/5/include/xmmintrin.h: In function ‘int fastf2i(float)’:
/usr/lib/gcc/x86_64-linux-gnu/5/include/xmmintrin.h:512:1: error: inlining failed in call to always_inline ‘int _mm_cvt_ss2si(__m128)’: target specific option mismatch
 _mm_cvt_ss2si (__m128 __A)
 ^

As far as I understand, it means that SSE intrinsics are compiled without setting -msse compiler flag. For some reason, it is required by GCC. The problem seems to be similar to the old issue.

Here is CMakeCache.txt from the build.

Passing "ALSOFT_REQUIRE_SSE2" to CMake does not help. "ALSOFT_ENABLE_SSE2_CODEGEN" does not help either.

[stgatilov]

Bruteforce approach worked:

self._cmake.definitions["CMAKE_C_FLAGS"] = "-msse2 -mfpmath=sse"
self._cmake.definitions["CMAKE_CXX_FLAGS"] = "-msse2 -mfpmath=sse"

That's equivalent to -DCMAKE_C_FLAGS="-msse2 -mfpmath=sse" -DCMAKE_CXX_FLAGS="-msse2 -mfpmath=sse", I guess

[kcat]

Are you able to show the command line it tried to use when it failed? The _mm_cvtt_ss2si and _mm_cvt_ss2si calls are done under the HAVE_SSE_INTRINSICS macro check, which gets set when

    foreach(flag_var ${SSE_FLAGS})
        set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag_var}")
    endforeach()

    check_c_source_compiles("#include <emmintrin.h>
        int main() {_mm_pause(); return 0;}" HAVE_SSE_INTRINSICS)

succeeds in CMake. The SSE_FLAGS were added to the project's compiler flags, and should include -msse2 -mfpmath=sse if it got to that point with 32-bit GCC.

[stgatilov]

I started putting message commands all over the CMake code, and found out that CMAKE_SIZEOF_VOID_P is 8 =)
I'm pretty sure it is the problem of conan recipe, and not of OpenAL itself.

Sorry for bothering.

[stgatilov]

Here is the conan issue: conan-io/conan-center-index#4889