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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