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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You need to use include_directories to tell cmake where to find headers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">include_directories(${CMAKE_SOURCE_DIR}/src)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://www.cmake.org/cmake/help/v3.0/command/include_directories.html">http://www.cmake.org/cmake/help/v3.0/command/include_directories.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://www.cmake.org/cmake/help/v3.0/variable/CMAKE_SOURCE_DIR.html">http://www.cmake.org/cmake/help/v3.0/variable/CMAKE_SOURCE_DIR.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> CMake [mailto:cmake-bounces@cmake.org]
<b>On Behalf Of </b>Chris Johnson<br>
<b>Sent:</b> Tuesday, December 02, 2014 11:04 AM<br>
<b>To:</b> cmake@cmake.org<br>
<b>Subject:</b> Re: [CMake] How to set path to library header files?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Ah, and I royally typo'd:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">prog.cpp includes the header via:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">#include "mylib/myfunc.h"<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">(not just "myfunc.h")<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, Dec 2, 2014 at 11:01 AM, Chris Johnson <<a href="mailto:cxjohnson@gmail.com" target="_blank">cxjohnson@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Background: I'm converting an existing project from a custom build process which uses BSD Make to CMake. The source for the project is contained in about 600 directories, and has about a dozen libraries
and maybe a hundred executables. The old build system (make) has to continue working until the new CMake-based system is fully operational and tested. For the most part, this has been straight forward and easy, since make is building in source using in-source
Makefiles. I've simply added a CMakeLists.txt file to each directory, and the actual CMake build occurs out-of-source. It's only the edge cases (of course!) which have given me a headache. I've solved some of them. This message is about one I have not
yet been able to solve.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">The basic problem is this: my executables cannot find the header files for some of the libraries, because they are in a subdirectory when installed, but are not in a subdirectory while in source.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Here's a simplified example (SSCCE) which reproduces this problem.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">The file structure:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">|-- bin/<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">|-- include/<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">| `-- mylib/<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">|-- lib/<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">`-- src/<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> |-- CMakeLists.txt<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> |-- mylib/<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> | |-- CMakeLists.txt<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> | |-- myfunc.cpp<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> | `-- myfunc.h<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> `-- prog/<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> |-- CMakeLists.txt<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> `-- prog.cpp<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">The top-level bin, include and lib directories are the install locations, exactly parallel to standard Unix locations. Note that file myfunc.h installs into ./include/mylib. Note also that prog.cpp
includes this header via #include "myfunc.h".<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Here are the current CMakeLists.txt files.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Top level (../src):<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">cmake_minimum_required(VERSION 2.8.4)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">project(src)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">add_subdirectory(mylib)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">add_subdirectory(prog)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">mylib:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">cmake_minimum_required(VERSION 2.8.4)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">project(mylib)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">set(CPP_SOURCE myfunc.cpp)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">set(HEADERS myfunc.h)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">add_library(mylib ${CPP_SOURCE} )<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">target_include_directories(<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mylib PUBLIC<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> # Headers used from source/build location:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>"<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> # Headers used from the installed location:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> "$<INSTALL_INTERFACE:include>"<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">install(TARGETS mylib DESTINATION lib)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">install(FILES ${HEADERS} DESTINATION include/mylib)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">prog:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">cmake_minimum_required(VERSION 2.8.4)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">project(prog)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">set(SOURCE_FILES prog.cpp)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">set(LIBS mylib)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">add_executable(prog ${SOURCE_FILES})<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">target_link_libraries(prog ${LIBS})<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">install(TARGETS prog DESTINATION bin)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">When I build, I get this error:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">src/.build$ make install<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">-- Configuring done<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">-- Generating done<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">-- Build files have been written to: /sandbox/src/.build<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Scanning dependencies of target mylib<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">[ 50%] Building CXX object mylib/CMakeFiles/mylib.dir/myfunc.cpp.o<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Linking CXX static library libmylib.a<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">[ 50%] Built target mylib<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Scanning dependencies of target prog<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">[100%] Building CXX object prog/CMakeFiles/prog.dir/prog.cpp.o<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">/sandbox/src/prog/prog.cpp:1:10: fatal error: 'mylib/myfunc.h'<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> file not found<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">#include "mylib/myfunc.h"<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> ^<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">1 error generated.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">make[2]: *** [prog/CMakeFiles/prog.dir/prog.cpp.o] Error 1<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">make[1]: *** [prog/CMakeFiles/prog.dir/all] Error 2<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">make: *** [all] Error 2<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">How can I create CMake rules that will allow me to work around this? <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">As I mentioned above, the existing make-based build has to continue working, so I cannot change the #include statement to remove the subdirectory path.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New";color:#888888"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New";color:#888888">..chris<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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