W. Felix Handte e668c9b528 Fix pkg-config File Generation Again ...

Revises #1851. Fixes #1900. Replaces #1930.

Thanks to @orbea, @neheb, @Polynomial-C, and particularly @eli-schwartz for
pointing out the problem and suggesting solutions.

Tested with

  ```
  make -C lib clean libzstd.pc
  cat lib/libzstd.pc

  # should fail
  make -C lib clean libzstd.pc     LIBDIR=/foo
  make -C lib clean libzstd.pc INCLUDEDIR=/foo
  make -C lib clean libzstd.pc     LIBDIR=/usr/localfoo
  make -C lib clean libzstd.pc INCLUDEDIR=/usr/localfoo
  make -C lib clean libzstd.pc     LIBDIR=/usr/local/lib     prefix=/foo
  make -C lib clean libzstd.pc INCLUDEDIR=/usr/local/include prefix=/foo

  # should succeed
  make -C lib clean libzstd.pc     LIBDIR=/usr/local/foo
  make -C lib clean libzstd.pc INCLUDEDIR=/usr/local/foo
  make -C lib clean libzstd.pc     LIBDIR=/usr/local/
  make -C lib clean libzstd.pc INCLUDEDIR=/usr/local/
  make -C lib clean libzstd.pc     LIBDIR=/usr/local
  make -C lib clean libzstd.pc INCLUDEDIR=/usr/local
  make -C lib clean libzstd.pc     LIBDIR=/tmp/foo prefix=/tmp
  make -C lib clean libzstd.pc INCLUDEDIR=/tmp/foo prefix=/tmp
  make -C lib clean libzstd.pc     LIBDIR=/tmp/foo prefix=/tmp/foo
  make -C lib clean libzstd.pc INCLUDEDIR=/tmp/foo prefix=/tmp/foo

  # should also succeed
  make -C lib clean libzstd.pc prefix=/foo LIBDIR=/foo/bar INCLUDEDIR=/foo/
  cat lib/libzstd.pc

  mkdir out
  cd out
  cmake ../build/cmake
  make
  cat lib/libzstd.pc
  ```

2020-02-18 12:23:50 -05:00

..

.gitignore

ignore more cmake build artefacts

2017-04-21 10:59:36 -07:00

cmake_uninstall.cmake.in

STYLE: Remove CMake-language block-end command arguments

2018-12-22 19:32:39 -06:00

CMakeLists.txt

Fix pkg-config File Generation Again

2020-02-18 12:23:50 -05:00

config.cmake.in

Make idiomatic cmake install so third party cmake installers work right.

2019-12-06 17:18:54 +00:00

pkgconfig.cmake

STYLE: Convert CMake-language commands to lower case

2018-12-22 19:32:39 -06:00