[CMake] How pass a -spec parameter to FindQt4.cmake?

[Clinton Stimpson]

On Thursday, July 21, 2011 11:48:04 pm Daniel Näslund wrote:
> On Thu, Jul 21, 2011 at 7:00 PM,  <clinton at elemtech.com> wrote:
> >> Managed to compile and link when I added the following snippet to the
> >> toolchain file:
> >> 
> >>     set(QT_HEADERS_DIR /opt/env/lenny-ppc/usr/lib)
> >>     set(QT_LIBRARY_DIR /opt/env/lenny-ppc/usr/include/qt4)
> >> 
> >>     set(QT_QTCORE_LIBRARY /opt/env/lenny-ppc/usr/lib/libQtCore.so)
> >>     set(QT_QTCORE_LIBRARY_RELEASE
> >>     /opt/env/lenny-ppc/usr/lib/libQtCore.so)
> >>     set(QT_QTCORE_INCLUDE_DIR /opt/env/lenny-ppc/usr/include/qt4)
> >> 
> >>     set(QT_QTDBUS_LIBRARY /opt/env/lenny-ppc/usr/lib/libQtDBus.so)
> >>     set(QT_QTDBUS_LIBRARY_RELEASE
> >>     /opt/env/lenny-ppc/usr/lib/libQtDBus.so)
> >>     set(QT_QTDBUS_INCLUDE_DIR /opt/env/lenny-ppc/usr/include/qt4)
> >> 
> >>     set(QT_QTXML_LIBRARY /opt/env/lenny-ppc/usr/lib/libQtXml.so)
> >>     set(QT_QTXML_LIBRARY_RELEASE
> >>     /opt/env/lenny-ppc/usr/lib/libQtXml.so)
> >>     set(QT_QTXML_INCLUDE_DIR /opt/env/lenny-ppc/usr/include/qt4)
> >> 
> >> Would have been nice if I didn't have to set those paths explicitely.
> >> Will continue the digging.
> > 
> > Does it work if you only specify just this:
> >    set(QT_HEADERS_DIR /opt/env/lenny-ppc/usr/include/qt4)
> >    set(QT_QTCORE_LIBRARY_RELEASE
> >  /opt/env/lenny-ppc/usr/lib/libQtCore.so)
> 
> Unfortunately no. I get:
> 
>     Warning: QT_QMAKE_EXECUTABLE reported QT_INSTALL_LIBS as /usr/lib
>     Warning: But QtCore couldn't be found.  Qt must NOT be installed
>     correctly, or it wasn't found for cross compiling.
>     CMake Error at /usr/share/cmake-2.8/Modules/FindQt4.cmake:642
> (MESSAGE): Could NOT find QtCore.  Check
> /tmp/tmpMm5uhv/CMakeFiles/CMakeError.log for more details.

Ok then perhaps you'll need a newer cmake for it to work.
I looked again and it should actually be as simple as:
set(QT_QTCORE_INCLUDE_DIR /opt/env/lenny-ppc/usr/include/qt4)
set(QT_QTCORE_LIBRARY_RELEASE /opt/env/lenny-ppc/usr/lib/libQtCore.so)
and the others should be found based on that.

> 
> > And I would have thought it can find QtCore if /opt/env/lenny-ppc/usr
> > was given as a find root.  No?
> 
> Adding /opt/env/lenny-ppc/usr causes Pkg-config to choke:
> 
>     -- checking for module 'ecco-sqlite-1.12'
>     /opt/env/lenny-ppc/usr/bin/pkg-config: 1: Syntax error: "(" unexpected
>     --   package 'ecco-sqlite-1.12' not found
>     CMake Error at
> /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake:266 (message):
>       A required package was not found
>     Call Stack (most recent call first):
>       /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake:320
> (_pkg_check_modules_internal)
>       CMakeLists.txt:51 (pkg_check_modules)
> 
> This happens for each of the libraries we're trying to detect with
> PkgConfig.

Ok, then it looks like the PkgConfig stuff needs fixed as well.

> 
> Adding /opt/env/lenny-ppc/usr/share/qt4 to CMAKE_FIND_ROOT_PATH gives:
> 
> -- Found Qt-Version 4.6.3 (using /usr/bin/qmake)
> CMake Error: The following variables are used in this project, but
> they are set to NOTFOUND.
> Please set them or make sure they are set and tested correctly in the
> CMake files:
> QT_QTCORE_INCLUDE_DIR (ADVANCED)
>    used as include directory in directory /home/dannas/bigsister_775
> 
> Trying to prefix the PATH enviroment variable with
> /opt/env/lenny-ppc/usr/share/qt4 gives the same result.

Ok, I think the following will fix that by automatically finding the headers if 
Qt was configured with "-headerdir include/qt4"

--- a/Modules/FindQt4.cmake
+++ b/Modules/FindQt4.cmake
@@ -620,7 +620,7 @@ IF (QT_QMAKE_EXECUTABLE AND QTVERSION)
       SET(QT_QTCORE_INCLUDE_DIR NOTFOUND)
       FIND_PATH(QT_QTCORE_INCLUDE_DIR QtCore
                 HINTS ${qt_headers} ${QT_LIBRARY_DIR}
-                PATH_SUFFIXES QtCore
+                PATH_SUFFIXES QtCore qt4/QtCore
         )

With that patch, and you adding /opt/env/lenny-ppc/usr to 
CMAKE_FIND_ROOT_PATH, then Qt will be found without you helping it (that is if 
the PkgConfig thing gets fixed too).

-- 
Clinton Stimpson
Elemental Technologies, Inc
Computational Simulation Software, LLC
www.csimsoft.com