[jira] [Created] (ARROW-17580) [Doc][C++][Python] Unclear how to influence compilation flags

["Antoine Pitrou (Jira)" <ji...@apache.org>]

Antoine Pitrou created ARROW-17580:
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             Summary: [Doc][C++][Python] Unclear how to influence compilation flags
                 Key: ARROW-17580
                 URL: https://issues.apache.org/jira/browse/ARROW-17580
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, Documentation, Python
            Reporter: Antoine Pitrou


Frequently people need to customize compilation flags for C++ and/or C files.

Unfortunately, both for Arrow C++ and PyArrow, it is very difficult to find out the proper way to do this.

For Arrow C++, it seems {{ARROW_CXXFLAGS}} should be passed to CMake, while the {{CXXFLAGS}} environment variable is ignored (it probably shouldn't?).

For PyArrow, I have not found a way to do it. The {{CXXFLAGS}} environment is ignored, and the {{PYARROW_CXXFLAGS}} has two problems:
* it is only recognized for Cython-generated files, not for PyArrow C++ sources
* it only affects linker calls, while it should actually affect compiler calls




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