[ARROW-18039] [C++][CI] Reduce MinGW build times

• Type: Wish
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++, Continuous Integration
• External issue URL: https://github.com/apache/arrow/issues/33242
• Assignee: Kouhei Sutou
• Reporter: Antoine Pitrou
• Created: 13/Oct/22 16:36
• Updated: 11/Jan/23 11:57

Description

The MinGW C++ builds on CI currently build in release mode. This is probably because debug builds on Windows are complicated (you must get all the dependencies also compiled in debug mode, AFAIU).

However, we could probably disable optimizations, so as to reduce compilation times.
The compilation flags are currently as follows:

-- CMAKE_C_FLAGS:  -O2 -DNDEBUG -ftree-vectorize  -Wa,-mbig-obj -Wall -Wno-conversion -Wno-sign-conversion -Wunused-result -fno-semantic-interposition -mxsave -msse4.2 
-- CMAKE_CXX_FLAGS:  -Wno-noexcept-type  -fdiagnostics-color=always -O2 -DNDEBUG -ftree-vectorize  -Wa,-mbig-obj -Wall -Wno-conversion -Wno-sign-conversion -Wunused-result -fno-semantic-interposition -mxsave -msse4.2 

Perhaps we can pass -O0?