[Bug 1460490] [NEW] pkg-config not correctly parsing some cflags and libs formats

[Valmiki]

Public bug reported:

Running 'pkg-config --cflags --libs' on the following (and attached)
foo.pc, outputs:

'-I/usr/include/ -I/usr/include/foo -I/usr/include/foo/  -L/usr/lib/
-L/usr/lib/foo -L/usr/lib/foo/ -lfoo'

The contents of foo.pc:
# Begin file

prefix=/usr
exec_prefix=${prefix}

includedir_1=${prefix}/include
includedir_2=${prefix}/include/
includedir_3=${prefix}/include/foo
includedir_4=${prefix}/include/foo/

libdir_1=${exec_prefix}/lib
libdir_2=${exec_prefix}/lib/
libdir_3=${exec_prefix}/lib/foo
libdir_4=${exec_prefix}/lib/foo/

Name: foo
Description: The foo library
Version: 1.0.0
Cflags: -I${includedir_2} -I${includedir_1} -I${includedir_3} -I${includedir_4}
Libs: -L${libdir_2} -L${libdir_1} -L${libdir_3} -L${libdir_4} -lfoo

#End file

Notice that 'includedir_1' and 'libdir_1' are not in the output. A
trailing slash had to be added to to their values to be parsed
correctly. This affects other libraries that use such variable use in
their pc config file, such as x11.pc and opencv.pc.

** Affects: pkg-config (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "foo.pc"
   https://bugs.launchpad.net/bugs/1460490/+attachment/4407762/+files/foo.pc

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https://bugs.launchpad.net/bugs/1460490

Title:
  pkg-config not correctly parsing some cflags and libs formats

Status in pkg-config package in Ubuntu:
  New

Bug description:
  Running 'pkg-config --cflags --libs' on the following (and attached)
  foo.pc, outputs:

  '-I/usr/include/ -I/usr/include/foo -I/usr/include/foo/  -L/usr/lib/
  -L/usr/lib/foo -L/usr/lib/foo/ -lfoo'

  The contents of foo.pc:
  # Begin file

  prefix=/usr
  exec_prefix=${prefix}

  includedir_1=${prefix}/include
  includedir_2=${prefix}/include/
  includedir_3=${prefix}/include/foo
  includedir_4=${prefix}/include/foo/

  libdir_1=${exec_prefix}/lib
  libdir_2=${exec_prefix}/lib/
  libdir_3=${exec_prefix}/lib/foo
  libdir_4=${exec_prefix}/lib/foo/

  Name: foo
  Description: The foo library
  Version: 1.0.0
  Cflags: -I${includedir_2} -I${includedir_1} -I${includedir_3} -I${includedir_4}
  Libs: -L${libdir_2} -L${libdir_1} -L${libdir_3} -L${libdir_4} -lfoo

  #End file

  Notice that 'includedir_1' and 'libdir_1' are not in the output. A
  trailing slash had to be added to to their values to be parsed
  correctly. This affects other libraries that use such variable use in
  their pc config file, such as x11.pc and opencv.pc.

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