Fix and improve building with clang-cl#251
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clang-cl does not like it if we try to check values of __GNUC__ without first checking whether it is defined, so fix things up here. clang-cl defines _MSC_VER and __clang__ but not __GNUC__.
clang-cl follows some of the compiler flags that are used for GCC, but not all them, so make sure that we don't try to use the compiler flags that it does not understand. Since the Visual Studio headers and libraries that clang-cl uses supported SSE 4.1 for a very long while, even before the inception of clang-cl, always pass in '-msse4.1' in the cflags when we are building with clang-cl (and it is needed, otherwise the build fails).
We can actually turn off the deprecation warnings from the Visual Studio headers that clang-cl uses, so let's do that.
...for SSE and ARM NEON intrinsics, since the __extension__ stuff is supported on clang-cl. Update the error messages accordingly.
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Hi,
This attempts to fix building with
clang-cl(the clang compiler that attempts to be MSVC compatible), by:graphene-macros.hby checking for the existance of__GNUC__before trying to check its value, sinceclang-cldefines_MSC_VERbut not__GNUC__, unlike clang on *NIX.clang-cl, which follows more the ones used on GCC than Visual Studio, and filter out those that aren't supported. Also, force-msse4.1since that is required for bulding the SSE 4.1 code onclang-cl.clang-clutilizes.clang-clfollow the GCC codepath, since__extension__is supported there as well.With blessings, thank you!