Using precompiled headers in my project (clang/llvm, but gcc as well). How to deploy the -include option at make?

Question

I have a quite large project that would enjoy some speedup in compilation. I'm on OSX 10.8 (clang/llvm), but I will port this to gcc as well. I am trying to tinker with .pch files but I noted in the llvm documentation that pch files are only parsed and used if -include is used at the command line. It doesn't automatically do it from the #include directive in the file.

I was wondering how to add automatically -include for the proper include files. I am using CMake to create the makefiles.

score 3 · Answer 1 · answered Apr 12 '14 at 16:10

3

Likely it's enough to add required flags to CMAKE_CXX_FLAGS. Something like

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -include <you-precompiled-header>")

answered Apr 12 '14 at 16:10

user3159253

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yes but I have to do that by hand. I would like to have it automatically. – Stefano Borini Apr 14 '14 at 11:47
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Hmm, create a macro :) Entire CMake is built around that :) – user3159253 Apr 14 '14 at 11:50

Using precompiled headers in my project (clang/llvm, but gcc as well). How to deploy the -include option at make?

1 Answers1