[ARROW-17580] [Doc][C++][Python] Unclear how to influence compilation flags

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Not A Problem
• Component/s: C++, Documentation, Python
• External issue URL: https://github.com/apache/arrow/issues/32828
• Assignee: Unassigned
• Reporter: Antoine Pitrou
• Created: 31/Aug/22 13:13
• Updated: 11/Jan/23 11:51
• Resolved: 08/Sep/22 09:54

Description

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 variable is ignored, and -the PYARROW_CXXFLAGS CMake variable 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 (edit: does it?)

Edit: I was wrong, the CXXFLAGS environment variable is not ignored.