Hello Guix, The 'staging' branch has been idle for a while because some Qt packages fail to build (as of commit b60d2bfff95c0859d7814c1fe9d0940c87edc2b4): * qtwayland: https://ci.guix.gnu.org/build/1851111/details * qtgamepad: https://ci.guix.gnu.org/build/1946382/details * qtwebglplugin: https://ci.guix.gnu.org/build/1830705/details Unfortunately none of the above log files show the real issue because of truncation: <https://bugs.gnu.org/37246>. The problem is that for these packages specifically, the Makefile generated by qmake references $out/lib/libQt5Core.so in LIBS (in _addition_ to $qtbase/lib/libQt5Core.so), which in turn breaks the GCC command line because $out/lib/libQt5Core.so obviously does not exist. Prior to Qt 5.12, qmake generated LIBS by adding appropriate -L and -l arguments to GCC such as "-L /gnu/store/abc123-foo/lib -l foo", whereas Qt 5.12 inserts absolute library references, i.e. "/gnu/store/abc123-foo/lib/libfoo.so". The former case worked because GCC gracefully handles duplicate -L and -l arguments as long as at least one of the '-L's are sane. The references comes from the .prl files shipped with qtbase, which contains entries such as: QMAKE_PRL_LIBS = $$[QT_INSTALL_LIBS]/libQt5Gui.so $$[QT_INSTALL_LIBS]/libQt5Core.so -lpthread /gnu/store/hhpkqcz4i8rsv3lk1iv694q0bkg2vij9-mesa-19.2.1/lib/libGL.so QT_INSTALL_LIBS behaves differently in Guix at "configure time" (qmake) and "build time" (when running "make", which creates other Makefiles). At configure time it correctly resolves to the qtbase output (because we patch qt_configure.prf to make it so). At build time, it is repurposed to be the installation prefix (i.e. $out/lib). It's not clear to me why only the three mentioned packages are affected. My current best guess is that they fail to probe for some (transitive?) dependency at "configure time", so no qmake cache entry is created. When these dependencies are resolved at "build time", QT_INSTALL_LIBS points to the wrong location, and the build fails. A workaround for this issue will be submitted shortly.
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