findpkgconfig.cmake

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# - a pkg-config module for CMake
#
# Usage:
#   pkg_check_modules(<PREFIX> [REQUIRED] <MODULE> [<MODULE>]*)
#     checks for all the given modules
#
#   pkg_search_module(<PREFIX> [REQUIRED] <MODULE> [<MODULE>]*)
#     checks for given modules and uses the first working one
#
# When the 'REQUIRED' argument was set, macros will fail with an error
# when module(s) could not be found
#
# It sets the following variables:
#   PKG_CONFIG_FOUND         ... true if pkg-config works on the system
#   PKG_CONFIG_EXECUTABLE    ... pathname of the pkg-config program
#   <PREFIX>_FOUND           ... set to 1 if module(s) exist
#
# For the following variables two sets of values exist; first one is the
# common one and has the given PREFIX. The second set contains flags
# which are given out when pkgconfig was called with the '--static'
# option.
#   <XPREFIX>_LIBRARIES      ... only the libraries (w/o the '-l')
#   <XPREFIX>_LIBRARY_DIRS   ... the paths of the libraries (w/o the '-L')
#   <XPREFIX>_LDFLAGS        ... all required linker flags
#   <XPREFIX>_LDFLAGS_OTHER  ... all other linker flags
#   <XPREFIX>_INCLUDE_DIRS   ... the '-I' preprocessor flags (w/o the '-I')
#   <XPREFIX>_CFLAGS         ... all required cflags
#   <XPREFIX>_CFLAGS_OTHER   ... the other compiler flags
#
#   <XPREFIX> = <PREFIX>        for common case
#   <XPREFIX> = <PREFIX>_STATIC for static linking
#
# There are some special variables whose prefix depends on the count
# of given modules. When there is only one module, <PREFIX> stays
# unchanged. When there are multiple modules, the prefix will be
# changed to <PREFIX>_<MODNAME>:
#   <XPREFIX>_VERSION    ... version of the module
#   <XPREFIX>_PREFIX     ... prefix-directory of the module
#   <XPREFIX>_INCLUDEDIR ... include-dir of the module
#   <XPREFIX>_LIBDIR     ... lib-dir of the module
#
#   <XPREFIX> = <PREFIX>  when |MODULES| == 1, else
#   <XPREFIX> = <PREFIX>_<MODNAME>
#
# A <MODULE> parameter can have the following formats:
#   {MODNAME}            ... matches any version
#   {MODNAME}>={VERSION} ... at least version <VERSION> is required
#   {MODNAME}={VERSION}  ... exactly version <VERSION> is required
#   {MODNAME}<={VERSION} ... modules must not be newer than <VERSION>
#
# Examples
#   pkg_check_modules (GLIB2   glib-2.0)
#
#   pkg_check_modules (GLIB2   glib-2.0>=2.10)
#     requires at least version 2.10 of glib2 and defines e.g.
#       GLIB2_VERSION=2.10.3
#
#   pkg_check_modules (FOO     glib-2.0>=2.10 gtk+-2.0)
#     requires both glib2 and gtk2, and defines e.g.
#       FOO_glib-2.0_VERSION=2.10.3
#       FOO_gtk+-2.0_VERSION=2.8.20
#
#   pkg_check_modules (XRENDER REQUIRED xrender)
#     defines e.g.:
#       XRENDER_LIBRARIES=Xrender;X11
#       XRENDER_STATIC_LIBRARIES=Xrender;X11;pthread;Xau;Xdmcp
#
#   pkg_search_module (BAR     libxml-2.0 libxml2 libxml>=2)


# Copyright (C) 2006 Enrico Scholz <[e-mail]>
#
# Redistribution and use, with or without modification, are permitted
# provided that the following conditions are met:
# 
#    1. Redistributions must retain the above copyright notice, this
#       list of conditions and the following disclaimer.
#    2. The name of the author may not be used to endorse or promote
#       products derived from this software without specific prior
#       written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


### Common stuff ####
set(PKG_CONFIG_VERSION 1)
set(PKG_CONFIG_FOUND   0)

find_program(PKG_CONFIG_EXECUTABLE NAMES pkg-config DOC "pkg-config executable")
mark_as_advanced(PKG_CONFIG_EXECUTABLE)

if(PKG_CONFIG_EXECUTABLE)
  set(PKG_CONFIG_FOUND 1)
endif(PKG_CONFIG_EXECUTABLE)


# Unsets the given variables
macro(_pkgconfig_unset var)
  set(${var} "" CACHE INTERNAL "")
endmacro(_pkgconfig_unset)

macro(_pkgconfig_set var value)
  set(${var} ${value} CACHE INTERNAL "")
endmacro(_pkgconfig_set)

# Invokes pkgconfig, cleans up the result and sets variables
macro(_pkgconfig_invoke _pkglist _prefix _varname _regexp)
  set(_pkgconfig_invoke_result)

  execute_process(
    COMMAND ${PKG_CONFIG_EXECUTABLE} ${ARGN} ${_pkglist}
    OUTPUT_VARIABLE _pkgconfig_invoke_result
    RESULT_VARIABLE _pkgconfig_failed)

  if (_pkgconfig_failed)
    set(_pkgconfig_${_varname} "")
    _pkgconfig_unset(${_prefix}_${_varname})
  else(_pkgconfig_failed)
    string(REGEX REPLACE "[\r\n]"                  " " _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")
    string(REGEX REPLACE " +$"                     ""  _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")

    if (NOT ${_regexp} STREQUAL "")
      string(REGEX REPLACE "${_regexp}" " " _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")
    endif(NOT ${_regexp} STREQUAL "")

    separate_arguments(_pkgconfig_invoke_result)

    #message(STATUS "  ${_varname} ... ${_pkgconfig_invoke_result}")
    set(_pkgconfig_${_varname} ${_pkgconfig_invoke_result})
    _pkgconfig_set(${_prefix}_${_varname} "${_pkgconfig_invoke_result}")
  endif(_pkgconfig_failed)
endmacro(_pkgconfig_invoke)

# Invokes pkgconfig two times; once without '--static' and once with
# '--static'
macro(_pkgconfig_invoke_dyn _pkglist _prefix _varname cleanup_regexp)
  _pkgconfig_invoke("${_pkglist}" ${_prefix}        ${_varname} "${cleanup_regexp}" ${ARGN})
  _pkgconfig_invoke("${_pkglist}" ${_prefix} STATIC_${_varname} "${cleanup_regexp}" --static  ${ARGN})
endmacro(_pkgconfig_invoke_dyn)

# Splits given arguments into options and a package list
macro(_pkgconfig_parse_options _result _is_req)
  set(${_is_req} 0)
  
  foreach(_pkg ${ARGN})
    if (_pkg STREQUAL "REQUIRED")
      set(${_is_req} 1)
    endif (_pkg STREQUAL "REQUIRED")
  endforeach(_pkg ${ARGN})

  set(${_result} ${ARGN})
  list(REMOVE_ITEM ${_result} "REQUIRED")
endmacro(_pkgconfig_parse_options)

###
macro(_pkg_check_modules_internal _is_required _is_silent _prefix)
  _pkgconfig_unset(${_prefix}_FOUND)
  _pkgconfig_unset(${_prefix}_VERSION)
  _pkgconfig_unset(${_prefix}_PREFIX)
  _pkgconfig_unset(${_prefix}_INCLUDEDIR)
  _pkgconfig_unset(${_prefix}_LIBDIR)
  _pkgconfig_unset(${_prefix}_LIBS)
  _pkgconfig_unset(${_prefix}_LIBS_L)
  _pkgconfig_unset(${_prefix}_LIBS_PATHS)
  _pkgconfig_unset(${_prefix}_LIBS_OTHER)
  _pkgconfig_unset(${_prefix}_CFLAGS)
  _pkgconfig_unset(${_prefix}_CFLAGS_I)
  _pkgconfig_unset(${_prefix}_CFLAGS_OTHER)
  _pkgconfig_unset(${_prefix}_STATIC_LIBDIR)
  _pkgconfig_unset(${_prefix}_STATIC_LIBS)
  _pkgconfig_unset(${_prefix}_STATIC_LIBS_L)