[MacPorts] #57009: ImageMagick @6.9.9-40_1: inserts -lgomp into pkgconfig files, which breaks build when using clang

[MacPorts]

#57009: ImageMagick @6.9.9-40_1: inserts -lgomp into pkgconfig files, which breaks
build when using clang
--------------------+-------------------------
 Reporter:  kencu   |      Owner:  ryandesign
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  ImageMagick
--------------------+-------------------------
 In the process of trying to upgrade `virtuoso-7` on my SnowLeopard system
 that is configured to LibcxxOnOlderSystems, the rebuild of `virtuoso-7`
 with `clang-3.9` fails due to:
 {{{
   CCLD     im.la
 ld: library not found for -lgomp
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 make[3]: *** [im.la] Error 1
 }}}

 it appears that this build is picking up this library from `ImageMagick`'s
 `pkgconfig` files:
 {{{
 $ pwd
 /opt/local/lib/pkgconfig

 $ ag lgomp .
 ImageMagick++-6.Q16.pc
 13:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 ImageMagick++.pc
 13:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 ImageMagick-6.Q16.pc
 14:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 ImageMagick.pc
 14:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 Magick++-6.Q16.pc
 13:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 Magick++.pc
 13:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 MagickCore-6.Q16.pc
 15:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 MagickCore.pc
 15:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 MagickWand-6.Q16.pc
 15:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 MagickWand.pc
 15:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 Wand-6.Q16.pc
 15:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm

 Wand.pc
 15:Libs.private: -L${libdir} -l${libname}  -L/opt/local/lib -llcms2
 -L/opt/local/lib -lfreetype   -L/opt/local/lib -lfftw3  -L/opt/local/lib
 -lxml2 -L/opt/local/lib -lfontconfig -lfreetype -lXext   -lSM -lICE -lX11
 -lXt -L/opt/local/lib -llzma -lbz2 -L/opt/local/lib -lz -lltdl  -lm -lgomp
 -lm
 }}}

 AFAIK, `lgomp` is only available when using `gcc` and as above, errors out
 when using `clang`. I am not certain why `ImageMagick` is inserting
 `lgomp` into it's recommended link libraries.

-- 
Ticket URL: <https://trac.macports.org/ticket/57009>
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