# - pkg-config module for CMake

#

# Defines the following macros:

#

# PKGCONFIG_FOUND(package found)

# PKGCONFIG(package includedir libdir linkflags cflags)

# PKGCONFIG_VERSION(package version)

# PKGCONFIG_DEFINITION(package definition)

# Calling PKGCONFIG_FOUND will fill into the argument the value of the package search's result

# e.g. PKGCONFIG_FOUND(libart-2.0 LIBART_FOUND)

#

# Calling PKGCONFIG_VERSION will fill the desired version into the argument,

# e.g. PKGCONFIG_VERSION(libart-2.0 LIBART_VERSION)

# 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

#

# Calling PKGCONFIG_VERSION will fill the desired version into the argument,

# e.g. PKGCONFIG_VERSION(libart-2.0 LIBART_VERSION)

#

# Calling PKGCONFIG_DEFINITION will fill the definition (e.g -D_REENTRANT) into the argument,

# e.g. PKGCONFIG_DEFINITION(libart-2.0 LIBART_DEFINITION)

find_program(PKGCONFIG_EXECUTABLE NAMES pkg-config PATHS /usr/local/bin )

macro(STRIP_NEWLINES _string_var)

string(REGEX REPLACE "[\n\r]+" "" ${_string_var} ${${_string_var}})

endmacro(STRIP_NEWLINES _string_var)

macro(PKGCONFIG_FOUND _package _found)

# reset the variable at the beginning

set(${_found})

# if pkg-config has been found

if(PKGCONFIG_EXECUTABLE)

exec_program(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --print-errors --exists RETURN_VALUE _return_VALUE OUTPUT_VARIABLE _pkgconfigDevNull )

if(${_pkgconfigDevNull})

message(STATUS "${_pkgconfigDevNull}")

endif(${_pkgconfigDevNull})

if(NOT _return_VALUE)

set(${_found} "TRUE")

endif(NOT _return_VALUE)

endif(PKGCONFIG_EXECUTABLE)

endmacro(PKGCONFIG_FOUND _found)

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 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 ${_package} --variable=includedir OUTPUT_VARIABLE ${_include_DIR} )

exec_program(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --variable=libdir OUTPUT_VARIABLE ${_link_DIR} )

exec_program(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --libs OUTPUT_VARIABLE ${_link_FLAGS} )

exec_program(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --cflags OUTPUT_VARIABLE ${_cflags} )

strip_newlines(${_cflags})

endif(NOT _return_VALUE)

endif(PKGCONFIG_EXECUTABLE)

endmacro(PKGCONFIG _include_DIR _link_DIR _link_FLAGS _cflags)

macro(PKGCONFIG_VERSION _package _version)

# reset the variables at the beginning

set(${_version})

# if pkg-config has been found

if(PKGCONFIG_EXECUTABLE)

exec_program(${PKGCONFIG_EXECUTABLE} ARGS --print-errors ${_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 --print-errors ${_package} --modversion OUTPUT_VARIABLE ${_version} )

endif(NOT _return_VALUE)

endif(PKGCONFIG_EXECUTABLE)

endmacro(PKGCONFIG_VERSION _package _version)

mark_as_advanced(PKGCONFIG_EXECUTABLE)

macro(PKGCONFIG_DEFINITION _package _definition)

# reset the variables at the beginning

set(${_definition})

# if pkg-config has been found

if(PKGCONFIG_EXECUTABLE)

exec_program(${PKGCONFIG_EXECUTABLE} ARGS --print-errors ${_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 --print-errors ${_package} --cflags-only-other OUTPUT_VARIABLE ${_definition} )

endif(NOT _return_VALUE)

endif(PKGCONFIG_EXECUTABLE)

endmacro(PKGCONFIG_DEFINITION _package _definition)

mark_as_advanced(PKGCONFIG_EXECUTABLE)