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# - pkg-config module for CMake
#
# Defines the following macros:
#
# PKGCONFIG(package includedir libdir linkflags cflags)
#
# Calling PKGCONFIG will fill the desired information into the 4 given arguments,
# e.g. PKGCONFIG(libart-2.0 LIBART_INCLUDE_DIR LIBART_LINK_DIR LIBART_LINK_FLAGS LIBART_CFLAGS)
# if pkg-config was NOT found or the specified software package doesn't exist, the
# variable will be empty when the function returns, otherwise they will contain the respective information
#
FIND_PROGRAM(PKGCONFIG_EXECUTABLE NAMES pkg-config PATHS /usr/local/bin )
MACRO(PKGCONFIG _package _include_DIR _link_DIR _link_FLAGS _cflags)
# reset the variables at the beginning
SET(${_include_DIR})
SET(${_link_DIR})
SET(${_link_FLAGS})
SET(${_cflags})
IF(MSVC)
SET(_msvc_mode --msvc-syntax)
ELSE(MSVC)
SET(_msvc_mode)
ENDIF(MSVC)
# if pkg-config has been found
IF(PKGCONFIG_EXECUTABLE)
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --exists RETURN_VALUE _return_VALUE OUTPUT_VARIABLE _pkgconfigDevNull )
# and if the package of interest also exists for pkg-config, then get the information
IF(NOT _return_VALUE)
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_msvc_mode} ${_package} --variable=includedir OUTPUT_VARIABLE __include_DIR)
STRING(REPLACE "\n" "" ${_include_DIR} ${__include_DIR})
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_msvc_mode} ${_package} --variable=libdir OUTPUT_VARIABLE __link_DIR)
STRING(REPLACE "\n" "" ${_link_DIR} ${__link_DIR})
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_msvc_mode} ${_package} --libs OUTPUT_VARIABLE __link_FLAGS)
STRING(REPLACE "\n" "" ${_link_FLAGS} ${__link_FLAGS})
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_msvc_mode} ${_package} --cflags OUTPUT_VARIABLE __cflags)
STRING(REPLACE "\n" "" ${_cflags} ${__cflags})
ENDIF(NOT _return_VALUE)
ENDIF(PKGCONFIG_EXECUTABLE)
ENDMACRO(PKGCONFIG _include_DIR _link_DIR _link_FLAGS _cflags)
MARK_AS_ADVANCED(PKGCONFIG_EXECUTABLE)
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