Problem using Vc with CMake 3.0 and kf5

Boudewijn Rempt boud at valdyas.org
Sat May 23 09:51:55 UTC 2015


Sorry for the extensive cross-posting in advance, please when replying, do 
a reply-all.

Just so everyone is on the same page: Vc is a template library that makes 
it easy to build vectorized code using a single source file. Krita uses Vc 
to optimize blending colors, creating masks and much more. Krita uses the 
most recent Vc release, 0.7.4: 
http://code.compeng.uni-frankfurt.de/news/27

We're currently porting Krita to Qt5 and KF5 and the way KF5 and Vc handle 
include directories is a big roadblock for us: 
https://git.reviewboard.kde.org/r/123179/ .

In a nutshell: Vc builds many different object files from single cpp file. 
It does this by creating a custom command for each target vectorization 
extension. To do that, it needs to access the contents of 
INCLUDE_DIRECTORIES, like this (in VcMacros.cmake: 
http://code.compeng.uni-frankfurt.de/projects/vc/repository/entry/cmake/VcMacros.cmake?rev=0.7)

    get_directory_property(_inc INCLUDE_DIRECTORIES)
    foreach(_i ${_inc})
       list(APPEND _flags "-I${_i}")
    endforeach()

In the end the command is generated like this:

          add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${_out}
             COMMAND ${CMAKE_CXX_COMPILER} ${_flags} ${_extra_flags}
             -DVC_IMPL=${_impl}
             ${_outfile_flag}${_out} 
${CMAKE_CURRENT_SOURCE_DIR}/${_vc_compile_src}
             MAIN_DEPENDENCY ${CMAKE_CURRENT_SOURCE_DIR}/${_vc_compile_src}
             IMPLICIT_DEPENDS CXX 
${CMAKE_CURRENT_SOURCE_DIR}/${_vc_compile_src}
             COMMENT "Building CXX object ${_out}"
             WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
             VERBATIM
             )
KF5 uses cmake generator expressions to derive the include 
directories from the target_link_libraries lines. This means that when we 
try to build our per-extensions object files we get this:



     [  0%] Building CXX object 
KoOptimizedCompositeOpFactoryPerArch_AVX.cpp.o
     cd /home/boud/kde/build/calligra/libs/pigment && /usr/bin/c++ 
-std=c++0x -fno-exceptions -Wall -Wextra -Wcast-align -Wchar-subscripts 
-Wformat-security -Wno-long-long -Wpointer-arith -Wundef 
-Wnon-virtual-dtor -Woverloaded-virtual -Werror=return-type 
-D__GNUC_UBUNTU_VERSION__=0xf040a -Wabi -fabi-version=0 -ffp-contract=fast 
-mtune=core2 -fPIC -I/home/boud/kde/src/calligra/interfaces 
-I/home/boud/kde/build/calligra -I/home/boud/kde/src/calligra 
-I/home/boud/kde/src/calligra/libs/version 
-I/home/boud/kde/build/calligra/libs/version 
-I/home/boud/kde/src/calligra/libs/koplugin 
-I/home/boud/kde/src/calligra/libs/version 
-I/home/boud/kde/build/calligra/libs/version 
-I/home/boud/kde/src/calligra/libs/pigment 
-I/home/boud/kde/src/calligra/libs/pigment/compositeops 
-I/home/boud/kde/src/calligra/libs/pigment/resources -I/usr/include 
-I/usr/include -I/usr/include/OpenEXR -I/usr/include -mavx -DVC_IMPL=AVX 
-c -oKoOptimizedCompositeOpFactoryPerArch_AVX.cpp.o 
/home/boud/kde/src/calligra/libs/pigment/compositeops/KoOptimizedCompositeOpFactoryPerArch.cpp

/home/boud/kde/src/calligra/libs/pigment/compositeops/KoOptimizedCompositeOpFactoryPerArch.cpp:22:19: 
fatal error: QString: No such file or directory
      #include <QString>
                        ^
     compilation terminated.
     libs/pigment/CMakeFiles/pigmentcms.dir/build.make:72: recipe for 
target 'libs/pigment/KoOptimizedCompositeOpFactoryPerArch_AVX.cpp.o' 
failed

On other words, INCLUDE_DIRECTORIES is empty, there's no Qt5, no Kf5 to be 
found.

If we manually set include directories like this:

if (HAVE_VC)
     message(".>>>>>>>>>>>>" ${KDE4_INCLUDES})
     include_directories(${KDE4_INCLUDES} ${Qt5Core_INCLUDE_DIRS} ${Qt5Gui_INCLUDE_DIRS} ${Qt5Xml_INCLUDE_DIRS} ${PIGMENT_INCLUDES}  ${Boost_INCLUDE_DIR})
endif()

We end up with the entire include line for the contents of KDE4_INCLUDES 
($<TARGET_PROPERTY:KF5::KDELibs4Support,INTERFACE_INCLUDE_DIRECTORIES>) 
expanded to a string with quotes around it:

    [  0%] Building CXX object 
KoOptimizedCompositeOpFactoryPerArch_AVX.cpp.o
     cd /home/boud/kde/build/calligra/libs/pigment && /usr/bin/c++ 
-std=c++0x -fno-exceptions -Wall -Wextra -Wcast-align -Wchar-subscripts 
-Wformat-security -Wno-long-long -Wpointer-arith -Wundef 
-Wnon-virtual-dtor -Woverloaded-virtual -Werror=return-type 
-D__GNUC_UBUNTU_VERSION__=0xf040a -Wabi -fabi-version=0 -ffp-contract=fast 
-mtune=core2 -fPIC -I/home/boud/kde/src/calligra/interfaces 
-I/home/boud/kde/build/calligra -I/home/boud/kde/src/calligra 
-I/home/boud/kde/src/calligra/libs/version 
-I/home/boud/kde/build/calligra/libs/version 
"-I/usr/include/KF5/KDELibs4Support;/usr/include/KF5/KDELibs4Support/KDE;/usr/include/KF5;/usr/include/x86_64-linux-gnu/qt5/;/usr/include/x86_64-linux-gnu/qt5/QtWidgets;/usr/include/x86_64-linux-gnu/qt5/;/usr/include/x86_64-linux-gnu/qt5/QtGui;/usr/include/x86_64-linux-gnu/qt5/;/usr/include/x86_64-linux-gnu/qt5/QtCore;/usr/lib/x86_64-linux-gnu/qt5//mkspecs/linux-g++-64;/usr/include/x86_64-linux-gnu/qt5/;/usr/include/x86_64-linux-gnu/qt5/QtDBus;/usr/include/x86_64-linux-gnu/qt5/;/usr/include/x86_64-linux-gnu/qt5/QtPrintSupport;/usr/include/KF5/KCoreAddons;/usr/include/KF5;/usr/include/KF5/KCrash;/usr/include/KF5;/usr/include/KF5/KWidgetsAddons;/usr/include/KF5;/usr/include/KF5/KConfigCore;/usr/include/KF5;/usr/include/KF5/KConfigWidgets;/usr/include/KF5;/usr/include/KF5/KCodecs;/usr/include/KF5;/usr/include/KF5/KConfigGui;/usr/include/KF5;/usr/include/x86_64-linux-gnu/qt5/;/usr/include/x86_64-linux-gnu/qt5/QtXml;/usr/include/KF5/KAuth;/usr/include/KF5;/usr/include/KF5/KIOCore;
 /usr/include/KF5;/usr/include/KF5/KService;/usr/include/KF5;/usr/include/KF5/KIOFileWidgets;/usr/include/KF5;/usr/include/KF5/KIOWidgets;/usr/include/KF5;/usr/include/KF5/KJobWidgets;/usr/include/KF5;/usr/include/x86_64-linux-gnu/qt5/;/usr/include/x86_64-linux-gnu/qt5/QtNetwork;/usr/include/KF5/KCompletion;/usr/include/KF5;/usr/include/KF5/KBookmarks;/usr/include/KF5;/usr/include/KF5/KItemViews;/usr/include/KF5;/usr/include/KF5/KXmlGui;/usr/include/KF5;/usr/include/KF5/Solid;/usr/include/KF5;/usr/include/KF5/KI18n;/usr/include/KF5;/usr/include/KF5/KNotifications;/usr/include/KF5;/usr/include/KF5/KIconThemes;/usr/include/KF5;/usr/include/KF5/KWindowSystem;/usr/include;/usr/include;/usr/include/KF5;/usr/include/KF5;/usr/include/KF5/KGuiAddons;/usr/include/KF5;/usr/include/KF5/KUnitConversion;/usr/include/KF5;/usr/include/KF5/KTextWidgets;/usr/include/KF5;/usr/include/KF5/SonnetUi;/usr/include/KF5;/usr/include/KF5/KParts;/usr/include/KF5" 
-I/usr/include/x86_64-linux-gnu/qt5 
-I/usr/include/x86_64-linux-gnu/qt5/QtCore 
-I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64 
-I/usr/include/x86_64-linux-gnu/qt5 
-I/usr/include/x86_64-linux-gnu/qt5/QtGui 
-I/usr/include/x86_64-linux-gnu/qt5/QtCore 
-I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64 
-I/usr/include/x86_64-linux-gnu/qt5 
-I/usr/include/x86_64-linux-gnu/qt5/QtXml 
-I/usr/include/x86_64-linux-gnu/qt5/QtCore 
-I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64 
-I/home/boud/kde/src/calligra/libs/koplugin 
-I/home/boud/kde/src/calligra/libs/version 
-I/home/boud/kde/build/calligra/libs/version 
-I/home/boud/kde/src/calligra/libs/pigment 
-I/home/boud/kde/src/calligra/libs/pigment/compositeops 
-I/home/boud/kde/src/calligra/libs/pigment/resources -I/usr/include 
-I/usr/include -I/usr/include/OpenEXR -I/usr/include -mavx -DVC_IMPL=AVX 
-c -oKoOptimizedCompositeOpFactoryPerArch_AVX.cpp.o 
/home/boud/kde/src/calligra/libs/pigment/compositeops/KoOptimizedCompositeOpFactoryPerArch.cpp
     In file included from 
/home/boud/kde/src/calligra/libs/pigment/DebugPigment.h:23:0,
                      from 
/home/boud/kde/src/calligra/libs/pigment/compositeops/KoOptimizedCompositeOpFactoryPerArch.cpp:23:
     /home/boud/kde/src/calligra/libs/pigment/pigment_export.h:24:23: fatal 
error: kdemacros.h: No such file or directory
      #include <kdemacros.h>
                            ^
     compilation terminated.
     libs/pigment/CMakeFiles/pigmentcms.dir/build.make:72: recipe for 
target 'libs/pigment/KoOptimizedCompositeOpFactoryPerArch_AVX.cpp.o' 
failed


And that's where I'm totally stuck. It seems the cmake 3.0/kf5/e-c-m (I 
don't know where this system came from) is incompatible with a key libary 
that I have to use. We can't drop using Vc, we cannot move to a newer 
release of Vc and I can't see a way to replicate the functionality of 
vc_compile_for_all_implementations in our own cmake code either, so please 
help!

Boudewijn





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