Re: [Mingw-cross-env-list] MXE, CMake, QT, undefined references

[Matthew Bucknall]

On 25 September 2012 19:15, Mark Brand <address@hidden> wrote:

Matthew Bucknall wrote:

Hi,

I'm currently trying to cross compile a CMake based QT project for Windows using MXE but I'm getting a whole load of undefined references (abbreviated):

...
/home/matt/Documents/Scratch/mxe/usr/lib/gcc/i686-pc-mingw32/4.7.0/../../../../i686-pc-mingw32/lib/libtiff.a(tif_lzma.o): In function `LZMAPreEncode':
/home/matt/Documents/Scratch/mxe/tmp-tiff/tiff-4.0.1/libtiff/tif_lzma.c:265: undefined reference to `lzma_stream_encoder'
/home/matt/Documents/Scratch/mxe/usr/lib/gcc/i686-pc-mingw32/4.7.0/../../../../i686-pc-mingw32/lib/libtiff.a(tif_lzma.o): In function `LZMAPreDecode':
/home/matt/Documents/Scratch/mxe/tmp-tiff/tiff-4.0.1/libtiff/tif_lzma.c:154: undefined reference to `lzma_stream_decoder'
/home/matt/Documents/Scratch/mxe/usr/lib/gcc/i686-pc-mingw32/4.7.0/../../../../i686-pc-mingw32/lib/libtiff.a(tif_lzma.o): In function `TIFFInitLZMA':
/home/matt/Documents/Scratch/mxe/tmp-tiff/tiff-4.0.1/libtiff/tif_lzma.c:460: undefined reference to `lzma_lzma_preset'
...
/home/matt/Documents/Scratch/mxe/usr/lib/gcc/i686-pc-mingw32/4.7.0/../../../../i686-pc-mingw32/lib/libmng.a(libmng_cms.o):libmng_cms.c:(.text+0xaab): undefined reference to `cmsCreateTransform'
/home/matt/Documents/Scratch/mxe/usr/lib/gcc/i686-pc-mingw32/4.7.0/../../../../i686-pc-mingw32/lib/libmng.a(libmng_cms.o):libmng_cms.c:(.text+0xae5): undefined reference to `cmsCreateTransform'
/home/matt/Documents/Scratch/mxe/usr/lib/gcc/i686-pc-mingw32/4.7.0/../../../../i686-pc-mingw32/lib/libmng.a(libmng_cms.o):libmng_cms.c:(.text+0xba1): undefined reference to `cmsDoTransform'
collect2: error: ld returned 1 exit status
make[2]: *** [src/placer/placer.exe] Error 1
make[1]: *** [src/placer/CMakeFiles/placer.dir/all] Error 2
make: *** [all] Error 2

The project builds fine with my native compiler and my CMakeLists.txt files include FIND_PACKAGE(Qt4 REQUIRED) and TARGET_LINK_LIBRARIES(placer ${QT_LIBRARIES}). I'm pretty new to CMake and MXE so I'd be really grateful if someone could suggest what might be wrong.

libtiff has dependencies -ltiff -llzma -ljpeg -lz. You can use pkg-config to list them:

    i686-pc-mingw32-pkg-config --libs libtiff-4

If you can add these libraries to your link command, it should solve the problem.

Mark

Thanks. I was expecting the Qt4 CMake package to ensure all dependencies are set in ${QT_LIBRARIES}, but evidently they are not. This got the build working:

find_package(Qt4 REQUIRED)

find_package(PkgConfig REQUIRED)

pkg_check_modules(DEPS QtCore QtGui)

...

include(${QT_USE_FILE})

add_definitions(${QT_DEFINITIONS})

link_directories(${DEPS_LIBRARY_DIRS})

include_directories(${DEPS_INCLUDE_DIRS})

...

target_link_libraries(placer ${QT_LIBRARIES} ${DEPS_LIBRARIES})

Before trying this, I tried find_package(Qt4 COMPONENTS QtCore QtGui REQUIRED), but that still resulted in loads of undefined references. Is this a bug?

Matt.