https://bugs.kde.org/show_bug.cgi?id=360249
--- Comment #6 from Jan Kundrát <j...@kde.org> --- (In reply to Hohyeis from comment #4) > Surprise: CXXFLAGS does not override all compiler parameters, including the > optimization. > > cmake -DCMAKE_CXX_FLAGS=-O0 ../trojita > make -j1 CXXFLAGS=-O0 VERBOSE=1 I am not sure what is the best way, cmake-wise, but I suspect it is this: 1) start from scratch 2) pass the CXXFLAGS as an env var to cmake, like this: `CXXFLAGS="-march=native -Og" cmake /path/to/source` 3) just run `make` with no additional parameters The end result which you'll get is something like compiler being executed with options such as `g++ -O2 -I/something -isystem /path/to/qt -Og -c foo.cpp -o CMakeFiles/foo.o`. Note that in this compiler's invocation, flags which come later on take precedence, so even though -O2 appears here, it will be built with -Og. > There is a second '-O2' which overrides the '-O0'. Please show us a full, unredacted compiler invocation if you think that there's a bug. It would be interesting to know if you start by `cmake -DCMAKE_CXX_FLAGS=...` or by `CXXFLAGS=... cmake ...`. > Build time for a single process 'make' build was 27 minutes, not including > 'make install', which compiled and linked things for more than 1 minute. Just out of curiosity, what platform and what sort of hardware are you on? If you have multiple CPU cores, there's also the option of using the -j parameter for make. Also, the build can be sped up quite a bit by passing -GNinja to cmake and running `ninja` instead of `make` if it's available on your platform. -- You are receiving this mail because: You are watching all bug changes.
