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# PkgConfigEx.cmake
#
# Extends CMake's PkgConfig module with commands:
#
# pkg_check_modules_for_option(_option_name _option_description _prefix _module0)
#
# which calls `pkg_check_modules(_prefix _module0)` and if <_prefix>_FOUND is False,
# then prints an error with a hint to disaable the _option_name if needed.
#
# pkg_check_exists(_output_name _pkg)
#
# calls pkg-config --exists for _pkg and stores the result to _output_name.
#
# pkg_check_at_least_version(_output_name _pkg _version)
#
# calls pkg-config --at-least-version=_version for _pkg and stores the result to _output_name.
#
# pkg_check_exact_version(_output_name _pkg _version)
#
# calls pkg-config --exact-version=_version for _pkg and stores the result to _output_name.
#
# pkg_check_variable(_output_name _pkg _name)
#
# gets a variable named _name from package _pkg and stores the result into _output_name
find_package(PkgConfig REQUIRED)
macro(pkg_check_modules_for_option _option_name _option_description _prefix _module0)
pkg_check_modules(${_prefix} ${_module0} ${ARGN})
if(NOT ${_prefix}_FOUND)
message(FATAL_ERROR "Necessary libraries not found or not enough version. If you want to disable ${_option_description}, please use -D${_option_name}=OFF argument to cmake command.")
endif(NOT ${_prefix}_FOUND)
endmacro()
macro(pkg_check_exists _output_name _pkg)
execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --exists ${_pkg}
RESULT_VARIABLE ${_output_name})
# Negate the result, because 0 means 'found'
if(${_output_name})
set(${_output_name} OFF)
else(${_output_name})
set(${_output_name} ON)
endif(${_output_name})
endmacro()
macro(pkg_check_at_least_version _output_name _pkg _version)
execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --atleast-version=${_version} ${_pkg}
RESULT_VARIABLE ${_output_name})
# Negate the result, because 0 means 'found'
if(${_output_name})
set(${_output_name} OFF)
else(${_output_name})
set(${_output_name} ON)
endif(${_output_name})
endmacro()
macro(pkg_check_exact_version _output_name _pkg _version)
execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --exact-version=${_version} ${_pkg}
RESULT_VARIABLE ${_output_name})
# Negate the result, because 0 means 'found'
if(${_output_name})
set(${_output_name} OFF)
else(${_output_name})
set(${_output_name} ON)
endif(${_output_name})
endmacro()
function(pkg_check_variable _output_name _pkg _name)
execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --variable=${_name} ${_pkg}
OUTPUT_VARIABLE _pkg_result
OUTPUT_STRIP_TRAILING_WHITESPACE)
set("${_output_name}" "${_pkg_result}" CACHE STRING "pkg-config variable ${_name} of ${_pkg}")
endfunction()
macro(add_pkgconfig_file _input _output)
configure_file(
${CMAKE_CURRENT_SOURCE_DIR}/${_input}
${CMAKE_CURRENT_BINARY_DIR}/${_output}
@ONLY
)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${_output}
DESTINATION ${LIB_INSTALL_DIR}/pkgconfig
)
endmacro()
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