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Posted to issues@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2022/11/02 20:38:00 UTC

[jira] [Created] (ARROW-18231) [C++] Cannot override optimization level using CXXFLAGS

Antoine Pitrou created ARROW-18231:
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             Summary: [C++] Cannot override optimization level using CXXFLAGS
                 Key: ARROW-18231
                 URL: https://issues.apache.org/jira/browse/ARROW-18231
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Antoine Pitrou


In release mode, Arrow C++ unconditionally adds {{-O2}} _at the end_ of the compiler flags.
So, if you do something like:
{code:bash}
export CXXFLAGS=-O0
cmake ...
{code}

the final compilation flags will look like {{-O0 -O2}}, meaning the user-provided optimization level is ignored.

One can instead use the {{ARROW_CXXFLAGS}} CMake variable, but it only overrides the flags for Arrow itself, not the bundled dependencies.




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