Fix #269: add C99 flag for intel compilers by telamonian · Pull Request #271 · python-cmake-buildsystem/python-cmake-buildsystem · GitHub
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Fix #269: add C99 flag for intel compilers#271

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Fix #269: add C99 flag for intel compilers#271
telamonian wants to merge 1 commit intopython-cmake-buildsystem:masterfrom
telamonian:patch-1

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@telamonian telamonian commented Sep 17, 2020

Fixes #269

The intel C compiler defaults to -std=gnu98, which apparently causes problems with recent cpython source. Judging by the existing code in CMakeLists.txt and this issue on the core cpython repo, somewhere around cpy3.6 cpython moved on to C99.

This PR ensures that if intel compilers are being used on cpy>=3.6 source, the -std=C99 flag will be added

The intel C compiler [defaults to `-std=gnu98`](https://software.intel.com/content/www/us/en/develop/documentation/cpp-compiler-developer-guide-and-reference/top/compiler-reference/compiler-options/compiler-option-details/language-options/std-qstd.html#std-qstd_GUID-338F4C2A-560C-4338-8ACF-C4B022A7C865), which apparently causes problems with recent cpython source. Judging by the existing code in `CMakeLists.txt` and [this issue on the core cpython repo](python/cpython#568), somewhere around cpy3.6 cpython moved on to C99.

This PR ensures that if intel compilers are being used on cpy>=3.6 source, the `-std=C99` flag will be added
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@certik
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certik commented Sep 17, 2020

Thanks, I'll give it a shot soon!

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concatime commented Nov 17, 2020

Why not simply add set(CMAKE_C_STANDARD 99), independently of the compiler used ?

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Fails to compile with icc

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