Hello,
I'm trying to understand how my C++ application can be compiled using CMake. Actually, there is an include file (foo.h) which contains this line boost::shared_ptr<imp> _p; but which doesn't contain #include <boost/shared_ptr.hpp>. I can't see any include or source file in my application which includes boost/shared_ptr.hpp, and which could permit boost/shared_ptr.hppto be indirectly included in foo.h. This line is needed In the CMakeLists.txt for the compilation to succeed : ADD_DEFINITIONS(-DUSE_BOOST_REGEX) When I generate the Makefile using this CMakeLists.txt, a DependInfo.cmake file and a flags.make file are also generated. DependInfo.cmake contains (among other things): # Preprocessor definitions for this target. SET(CMAKE_TARGET_DEFINITIONS "DEBUG" "DEBUG_LOG" "USE_BOOST_REGEX" ... ) flags.make contains (among other things): # compile CXX with /usr/bin/c++ CXX_DEFINES = DEBUG -DDEBUG_LOG -DUSE_BOOST_REGEX Thus USE_BOOST_REGEX is a flag used by the preprocessor to enabled the compilation of boost_regex component (if not already done). But I cant' see anything like #ifdefined USE_BOOST_REGEX #include <boost/shared_ptr.hpp> #endif in any of my application include or source files. So, how does this flag work? Is it related to CMake or only with gcc? My knowledge about how CXX_DEFINES works are quite limited. Do all "USE*" preprocessor flags work in the same way? Generally, when do I have to add this kind of preprocessor definitions? Thank in advance for your help. Regards, Camille
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