/usr/share/doc/libplplot11/examples/cmake/modules/pkg-config.cmake is in libplplot-dev 5.9.9-2ubuntu2.
This file is owned by root:root, with mode 0o644.
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#
# Copyright (C) 2006 Alan W. Irwin
#
# This file is part of PLplot.
#
# PLplot is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published
# by the Free Software Foundation; version 2 of the License.
#
# PLplot is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with the file PLplot; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# Module for determining pkg-config configuration variables related to the
# install-tree build of the examples.
# Also create useful macros called pkg_check_pkgconfig to emulate the
# pkgconfig macro using the pkg_check_modules macro;
# pkg_config_link_flags to process CMake link flags into
# pkg-config standard form for the configured output *.pc files, and
# cmake_link_flags to process input link flags delivered
# by pkg-config into CMake standard form.
# The following variables are set:
# PKG_CONFIG_EXECUTABLE - name of pkg-config executable, but can also be
# used for logical control with, e.g.,
# if(PKG_CONFIG_EXECUTABLE)
# pkg_config_true - if null string, then example builds done with
# pkg-config method. if "#" then that method is
# commented out.
# pkg_config_false - always "#" to comment out example builds with
# plplot_config method which does not exist for
# cmake build system.
# PKG_CONFIG_DIR - install location for configured PLplot
# pkg-config files.
# PKG_CONFIG_ENV - the string PKG_CONFIG_PATH=${PKG_CONFIG_DIR} which
# is used in example builds.
include(FindPkgConfig)
set(pkg_config_false "#")
if(PKG_CONFIG_EXECUTABLE)
message(STATUS "Looking for pkg-config - found")
set(pkg_config_true "")
set(PKG_CONFIG_DIR ${LIB_DIR}/pkgconfig)
set(PKG_CONFIG_ENV PKG_CONFIG_PATH=${PKG_CONFIG_DIR})
else(PKG_CONFIG_EXECUTABLE)
message(STATUS "Looking for pkg-config - not found")
message(STATUS
"WARNING: Makefile+pkg-config version of examples build in the install tree will be disabled.")
# Turn off pkg-config build. (This means both build methods will be
# commented out.)
set(pkg_config_true "#")
endif(PKG_CONFIG_EXECUTABLE)
macro(pkg_check_pkgconfig _package _include_DIR _link_DIR _link_FLAGS _cflags _version)
# Similar to legacy pkgconfig only these results are derived
# from pkg_check_modules and therefore are returned as lists rather than
# blank-delimited strings. Also, the _link_FLAGS value is converted
# to the preferred CMake form via the cmake_link_flags macro.
# N.B. if using this macro in more than one context, cache clashes will
# occur unless optional trailing prefix argument is specified to distinguish
# different contexts.
set(_prefix ${ARGN})
if(NOT _prefix)
set(_prefix "_PKGCONFIG_TMP")
endif(NOT _prefix)
_pkg_check_modules_internal(0 0 ${_prefix} "${_package}")
if (${_prefix}_FOUND)
set(${_include_DIR} ${${_prefix}_INCLUDE_DIRS})
set(${_link_DIR} ${${_prefix}_LIBRARY_DIRS})
cmake_link_flags(${_link_FLAGS} "${${_prefix}_LDFLAGS}")
set(${_cflags} ${${_prefix}_CFLAGS})
set(${_version} ${${_prefix}_VERSION})
set(_return_VALUE 0)
else(${_prefix}_FOUND)
set(${_include_DIR})
set(${_link_DIR})
set(${_link_FLAGS})
set(${_cflags})
set(${_version})
set(_return_VALUE 1)
endif(${_prefix}_FOUND)
#message("${_prefix}_FOUND = ${${_prefix}_FOUND}")
#message("${_include_DIR} = ${${_include_DIR}}")
#message("${_link_DIR} = ${${_link_DIR}}")
#message("${_link_FLAGS} = ${${_link_FLAGS}}")
#message("${_cflags} = ${${_cflags}}")
endmacro(pkg_check_pkgconfig)
macro(pkg_config_link_flags _link_flags_out _link_flags_in)
# Transform link flags into a form that is suitable to be used for
# output pkg-config (*.pc) files.
# N.B. ${_link_flags_in} must be a string and not a list.
# First strip out optimized / debug options which are not needed
# Currently only FindQt4 seems to need this.
if(CMAKE_BUILD_TYPE MATCHES "Debug")
# Get rid of the optimized keyword and immediately following library as
# well as the debug keyword anywhere such patterns occur in the list.
string(REGEX REPLACE "(^|;)optimized;[^;]*;" "\\1" ${_link_flags_out} "${_link_flags_in}")
string(REGEX REPLACE "(^|;)debug;" "\\1" ${_link_flags_out} "${${_link_flags_out}}")
else(CMAKE_BUILD_TYPE MATCHES "Debug")
# Get rid of the debug keyword and immediately following library as
# well as the optimized keyword anywhere such patterns occur in the list.
string(REGEX REPLACE "(^|;)debug;[^;]*;" "\\1" ${_link_flags_out} "${_link_flags_in}")
string(REGEX REPLACE "(^|;)optimized;" "\\1" ${_link_flags_out} "${${_link_flags_out}}")
endif(CMAKE_BUILD_TYPE MATCHES "Debug")
#message("(original link flags) = ${_link_flags_in}")
# Convert link flags to a blank-delimited string.
string(REGEX REPLACE ";" " " ${_link_flags_out} "${${_link_flags_out}}")
#message("(blanks) ${_link_flags_out} = ${${_link_flags_out}}")
# Replace actual library names with the -LPATHNAME and -lLIBRARYNAME form
# since it appears pkg-config handles that latter form much better (with
# regard to keeping the correct order and eliminating duplicates).
# These REGEX REPLACE's won't actually replace anything on bare windows since
# library names are not of this form on that platform. Something to be
# considered later if we decide to use pkg-config on bare windows.
# This logic will need to be expanded for Unix platforms other than
# Mac OS X and Linux.
if(APPLE)
set(suffix_list ".so" ".a" ".dylib")
else(APPLE)
set(suffix_list ".so" ".a")
endif(APPLE)
foreach(suffix ${suffix_list})
string(
REGEX REPLACE "(/[^ ]*)/lib([^ ]*)\\${suffix}" "-L\\1 -l\\2"
${_link_flags_out}
"${${_link_flags_out}}"
)
#message("(${suffix}) ${_link_flags_out} = ${${_link_flags_out}}")
endforeach(suffix ${suffix_list})
if(APPLE)
# For Mac OS X transform frameworks information into correct form.
string(
REGEX REPLACE
"/System/Library/Frameworks/([^ ]*)\\.framework"
"-framework \\1"
${_link_flags_out}
${${_link_flags_out}}
)
#message("(frameworks) ${_link_flags_out} = ${${_link_flags_out}}")
endif(APPLE)
endmacro(pkg_config_link_flags)
macro(cmake_link_flags _link_flags_out _link_flags_in)
# Transform link flags delivered by pkg-config into the best form
# for CMake.
# N.B. may need revision for windows since the current assumption
# is pkg-config delivers link flags using the -L and -l options which
# may not be the case for windows.
# N.B. ${_link_flags_in} must be a string and not a list.
if("${_link_flags_in}" STREQUAL "")
set(${_link_flags_out})
else("${_link_flags_in}" STREQUAL ""})
#message("(original link flags) = ${_link_flags_in}")
# Convert link flags to a list. Note some link flags are blank-delimited
# (such as "-framework whatever") so preserve those by splitting into
# separate list elements only if the next element starts with a hyphen.
string(REGEX REPLACE " -" ";-" _link_flags_list "${_link_flags_in}")
# Extract list of directories from -L options.
list(LENGTH _link_flags_list _link_flags_length)
math(EXPR _link_flags_length "${_link_flags_length} - 1")
set(_index_list)
set(_link_directory_list)
foreach(_list_index RANGE ${_link_flags_length})
list(GET _link_flags_list ${_list_index} _list_element)
string(REGEX REPLACE "^-L" "" _list_element1 "${_list_element}")
if(_list_element STREQUAL "-L${_list_element1}")
list(APPEND _index_list ${_list_index})
list(APPEND _link_directory_list ${_list_element1})
endif(_list_element STREQUAL "-L${_list_element1}")
endforeach(_list_index RANGE ${_link_flags_length})
#message("_index_list = ${_index_list}")
if("${_index_list}" STREQUAL "")
else("${_index_list}" STREQUAL "")
# Remove -L options from list.
list(REMOVE_AT _link_flags_list ${_index_list})
endif("${_index_list}" STREQUAL "")
#message("_link_directory_list = ${_link_directory_list}")
#message("_link_flags_list (without -L options) = ${_link_flags_list}")
# Derive ${_link_flags_out} from _link_flags_list with -l options
# replaced by complete pathname of library.
list(LENGTH _link_flags_list _link_flags_length)
math(EXPR _link_flags_length "${_link_flags_length} - 1")
set(${_link_flags_out})
foreach(_list_index RANGE ${_link_flags_length})
list(GET _link_flags_list ${_list_index} _list_element)
string(REGEX REPLACE "^-l" "" _list_element1 "${_list_element}")
if(_list_element STREQUAL "-l${_list_element1}")
set(_library_pathname "_library_pathname-NOTFOUND")
find_library(
_library_pathname
${_list_element1}
PATHS ${_link_directory_list}
NO_DEFAULT_PATH
)
# Try second time (without NO_DEFAULT_PATH) just in case pkg-config
# specified some system libraries without corresponding -L options.
find_library(
_library_pathname
${_list_element1}
PATHS ${_link_directory_list}
)
if(NOT _library_pathname)
message(
"Cannot find library corresponding to linker option ${_list_element}"
)
message(
"original link flags delivered by pkg-config = ${_link_flags_in}"
)
message(FATAL_ERROR "FATAL ERROR in cmake_link_flags macro")
endif(NOT _library_pathname)
list(APPEND ${_link_flags_out} ${_library_pathname})
else(_list_element STREQUAL "-L${_list_element1}")
# link options that are not -L or -l passed through in correct order
# in ${_link_flags_out}.
list(APPEND ${_link_flags_out} ${_list_element})
endif(_list_element STREQUAL "-l${_list_element1}")
endforeach(_list_index RANGE ${_link_flags_length})
#message("${_link_flags_out} = ${${_link_flags_out}}")
endif("${_link_flags_in}" STREQUAL "")
endmacro(cmake_link_flags)
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