Message 350645 - Python tracker

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Content 
When using the `has_function` method of a CCompiler object,
the compiler will emit a warning because the main function has no return type specified.

https://github.com/python/cpython/blob/8c9e9b0cd5b24dfbf1424d1f253d02de80e8f5ef/Lib/distutils/ccompiler.py#L784-L786

This warning is emitted:
/tmp/clockq2_azlzj.c:2:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
    2 | main (int argc, char **argv) {
      | ^~~~

This happens under Linux, gcc 9