[MacPorts] #50709: port:opencv+qt4 uses Qt5 if both Qt4 and Qt5 are installed

[MacPorts]

#50709: port:opencv+qt4 uses Qt5 if both Qt4 and Qt5 are installed
--------------------------+--------------------------------
  Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:  opencv       |
--------------------------+--------------------------------

Comment (by rjvbertin@…):

 In addition, I'm seeing the following error when building VLC against
 `port:opencv+qt5` :

 {{{
 make[5]: Entering directory `/Volumes/Debian/MP9/var/macports/build
 /_Volumes_Debian_MP9_site-
 ports_multimedia_VLC/VLC/work/vlc-2.2.2/modules/video_filter'
 ../../doltlibtool  --tag=CC   --mode=link /usr/bin/clang
 -I/opt/local/include/opencv -I/opt/local/include   -O3 -march=native -g
 -arch x86_64 -D_INTL_REDIRECT_MACROS
 -I/Volumes/Debian/MP9/var/macports/build/_Volumes_Debian_MP9_site-
 ports_multimedia_VLC/VLC/work/vlc-2.2.2/contrib/include -Wall -Wextra
 -Wsign-compare -Wundef -Wpointer-arith -Wbad-function-cast -Wwrite-strings
 -Wmissing-prototypes -Wvolatile-register-var -Werror-implicit-function-
 declaration -pipe -fvisibility=hidden -O3 -ffast-math -funroll-loops
 -fomit-frame-pointer -avoid-version -module -export-symbols-regex
 ^vlc_entry -shrext .dylib -no-undefined ../../compat/libcompat.la
 ../../src/libvlccore.la  -rpath '/opt/local/lib/vlc/plugins/video_filter'
 -L/opt/local/lib -Wl,-headerpad_max_install_names -L/opt/local/lib/samba3
 -arch x86_64 -Wl,-headerpad_max_install_names
 -L/Volumes/Debian/MP9/var/macports/build/_Volumes_Debian_MP9_site-
 ports_multimedia_VLC/VLC/work/vlc-2.2.2/contrib/lib -o
 libopencv_wrapper_plugin.la  libopencv_wrapper_plugin_la-opencv_wrapper.lo
 -L/opt/local/lib
 -L/opt/local/libexec/qt5/Library/Frameworks/QtCore.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtGui.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtWidgets.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtTest.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtConcurrent.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtOpenGL.framework
 -L/opt/local/lib -L//System/Library/Frameworks -lopencv_shape
 -lopencv_stitching -lopencv_objdetect -lopencv_superres -lopencv_videostab
 -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio
 -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml
 -lopencv_imgproc -lopencv_flann -lopencv_core -lQtCore -lQtGui -lQtWidgets
 -lQtTest -lQtConcurrent -lQtOpenGL -lwebp -lpng -ltiff -ljasper -ljpeg
 -lImath -lIlmImf -lIex -lHalf -lIlmThread -lavcodec-2 -lavformat-2
 -lavutil-2 -lswscale-2 -lavresample-2 -lz -lbz2 -framework
 VideoDecodeAcceleration -framework QTKit -framework QuartzCore -framework
 AppKit -ltbb -ltbbmalloc -lAGL -lOpenGL
 libtool: link: rm -fr  .libs/libopencv_wrapper_plugin.exp
 libtool: link: /opt/local/bin/nm  .libs/libopencv_wrapper_plugin_la-
 opencv_wrapper.o   | sed -n -e 's/^.*[       ]\([BCDEGRST][BCDEGRST]*\)[
 ][      ]*_\([_A-Za-z][_A-Za-z0-9]*\)$/\1 _\2 \2/p' | sed '/ __gnu_lto/d'
 | /opt/local/bin/gsed 's/.* //' | sort | uniq >
 .libs/libopencv_wrapper_plugin.exp
 libtool: link: /usr/bin/grep -E -e "^vlc_entry"
 ".libs/libopencv_wrapper_plugin.exp" >
 ".libs/libopencv_wrapper_plugin.expT"
 libtool: link: mv -f ".libs/libopencv_wrapper_plugin.expT"
 ".libs/libopencv_wrapper_plugin.exp"
 libtool: link: sed -e 's|^|_|' < .libs/libopencv_wrapper_plugin.exp >
 .libs/libopencv_wrapper_plugin-symbols.expsym
 libtool: link: /usr/bin/clang  -o .libs/libopencv_wrapper_plugin.dylib
 -bundle  .libs/libopencv_wrapper_plugin_la-opencv_wrapper.o
 ../../compat/.libs/libcompat.a -L/opt/local/lib -L/opt/local/lib/samba3
 -L/Volumes/Debian/MP9/var/macports/build/_Volumes_Debian_MP9_site-
 ports_multimedia_VLC/VLC/work/vlc-2.2.2/contrib/lib
 ../../src/.libs/libvlccore.dylib -lintl -lidn -liconv -lm -ldbus-1
 -L/opt/local/libexec/qt5/Library/Frameworks/QtCore.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtGui.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtWidgets.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtTest.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtConcurrent.framework
 -L/opt/local/libexec/qt5/Library/Frameworks/QtOpenGL.framework
 -L//System/Library/Frameworks -lopencv_shape -lopencv_stitching
 -lopencv_objdetect -lopencv_superres -lopencv_videostab -lopencv_calib3d
 -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs
 -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann
 -lopencv_core -lQtCore -lQtGui -lQtWidgets -lQtTest -lQtConcurrent
 -lQtOpenGL -lwebp -lpng -ltiff -ljasper -ljpeg -lImath -lIlmImf -lIex
 -lHalf -lIlmThread -lavcodec-2 -lavformat-2 -lavutil-2 -lswscale-2
 -lavresample-2 -lz -lbz2 -framework VideoDecodeAcceleration -framework
 QTKit -framework QuartzCore -framework AppKit -ltbb -ltbbmalloc -lAGL
 -lOpenGL  -O3 -march=native -g -arch x86_64 -O3
 -Wl,-headerpad_max_install_names -arch x86_64
 -Wl,-headerpad_max_install_names   -framework VideoDecodeAcceleration
 -framework QTKit -framework QuartzCore -framework AppKit
 -Wl,-exported_symbols_list,.libs/libopencv_wrapper_plugin-symbols.expsym
 ld: library not found for -lQtCore
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 }}}

 Data like `-L/opt/local/libexec/qt5/Library/Frameworks/QtOpenGL.framework`
 comes from opencv.pc (Libs.private), and is not correct. It should be
 `-framework /opt/local/.../QtFoo.framework` without a subsequent
 `-lQtFoo`. The exact path to Qt's frameworks should be obtained from the
 appropriate Qt PortGroup.

-- 
Ticket URL: <https://trac.macports.org/ticket/50709#comment:1>
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