On Mon, Apr 24, 2017 at 10:02 AM, Ben Boeckel <ben.boec...@kitware.com> wrote: > On Mon, Apr 24, 2017 at 09:54:18 -0500, Robert Dailey wrote: >> On Fri, Apr 21, 2017 at 4:48 PM, Robert Dailey <rcdailey.li...@gmail.com> >> wrote: >> > I'm running CMake 3.8.0 on Ubuntu 14. I invoke the following: >> > >> > find_package(PNG REQUIRED) >> > >> > Which gives me the output in CMake: >> > >> > Could NOT find PNG (missing: PNG_LIBRARY) (found version "1.2.50") >> > >> > The CMakeCache.txt file has these variables set: >> > >> > PNG_LIBRARY_DEBUG:FILEPATH=PNG_LIBRARY_DEBUG-NOTFOUND >> > PNG_LIBRARY_RELEASE:FILEPATH=PNG_LIBRARY_RELEASE-NOTFOUND >> > PNG_PNG_INCLUDE_DIR:PATH=/usr/include >> > >> > So it found the headers, but not the libs. Why did it not find the >> > libs? Note that my version of Ubuntu is 64-bit, and I've installed the >> > 32-bit libs like so: >> > >> > $ sudo apt-get install libpng12-dev:i386 > > What compiler are you using (what does CMake say it is?)? Does an > `strace` of CMake configuring the project show anything interesting? > `cmake --trace-expand`?
It's using Gcc 4.9 because I told it to via toolchain file: -- The C compiler identification is GNU 4.9.4 -- The CXX compiler identification is GNU 4.9.4 -- Check for working C compiler: /usr/bin/gcc-4.9 -- Check for working C compiler: /usr/bin/gcc-4.9 -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Check for working CXX compiler: /usr/bin/g++-4.9 -- Check for working CXX compiler: /usr/bin/g++-4.9 -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done Via the following toolchain file contents: set( CMAKE_SYSTEM_NAME Linux ) set( CMAKE_SYSTEM_VERSION 1 ) set( CMAKE_SYSTEM_PROCESSOR "i686" ) set( CMAKE_C_COMPILER gcc-4.9 ) set( CMAKE_CXX_COMPILER g++-4.9 ) set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32" ) set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32" ) I'm not sure how to use strace. I tried following instructions I found on the [CMake Performance Tips][1] page, but this isn't working. My generate command has a lot of options, so I use a helper shell script to generate. strace seems to not work well when using a shell script. Trace also doesn't show much useful. Could you give exact command line I can run to get the info you need? Where possible, I install everything via apt-get for the 4.9 toolchain. For libpng this was not an option as far as I could tell, so I'm not sure what implications that has on find_package() behavior. -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake