On Monday, December 07, 2015 15:39:40 Attila Krasznahorkay wrote: > Dear All, > > I'm still debugging the performance problems of our build. But now I bumped > into another surprising thing. > > Our "highest level" packages can depend on a *lot* of low level packages. > The one I'm testing now depends on more than 180 of them. > > This generates >180 -isystem flags for the compilation lines. But I found a > very surprising thing. If I replace all of these -isystem flags with -I > ones by simply modifying the flags.cmake files that CMake generated for me, > the build time of my code is cut to less than half of what it is when using > -isystem. > > So... How do I tell CMake to forget about using -isystem all together, and > take all my include directories with -I? > > Not using SYSTEM in target_include_directories and include_directories > doesn't seem to make a difference. I still get all my out-of-source > directories with -isystem. I even tried setting > CMAKE_INCLUDE_SYSTEM_FLAG_CXX and CMAKE_INCLUDE_SYSTEM_FLAG_C to "-I " > forcefully. But this didn't help either. Neither did explicitly unsetting > these variables.
I would have expected this to work. Maybe set them to -I on the initial cmake run ? Alex
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