D29096: Prefix includes and libs dir with QT_SYSROOT

[Erik Schilling]

ablu added a comment.


  The SYSROOT variable should not (directly) impact that. The install directory is configured by ECM_MKSPECS_INSTALL_DIR, which usually will point to /usr/lib/mkspecs/modules/ on Linux. For a cross-compile toolchain it will however be additionally prefixed with separate path. But Qt and qmake will also be configured with that prefix so those know to lookup the mkspecs dir under that prefix. Issuing QT += <module> can then trigger the including of the include and lib paths from the .pri generated by this code. So the case I am trying to fix with this patch is the case where the .pri is found (so ECM_MKSPECS_INSTALL_DIR was specified correctly) but now the libs and include paths are pointing to /usr/{include,lib} and not to <cross-compile-prefix>/usr/{include,lib}. Now since <cross-compile-prefix> can differ depending on the installation dir of the tool chain it may not be possible to know that path during compile / install time. However, we can assume that Qt / qmake will know about the sysroot (which is the prefix essentially). So as long qmake is configured for the cross compile our Qt module now should be too.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D29096

To: ablu
Cc: kossebau, kde-frameworks-devel, kde-buildsystem, LeGast00n, cblack, bencreasy, michaelh, ngraham, bruns
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