Merge branch 'pc-full-paths' into 'main'

cmake: use CMAKE_INSTALL_FULL_* in the pc file

See merge request iniparser/iniparser!168

CMakeLists.txt

@@ -6,6 +6,9 @@ include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
 include(CMakeDependentOption)
 
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
+  "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
 option(
   BUILD_SHARED_LIBS
   "Build using shared libraries"
@@ -108,6 +111,9 @@ file(COPY ${FIND_MODULES} DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 # add to CMake registry
 export(PACKAGE ${PROJECT_NAME})
 # generate pc-file
+include(JoinPaths)
+join_paths(libdir_for_pc_file "\${exec_prefix}" "${CMAKE_INSTALL_LIBDIR}")
+join_paths(includedir_for_pc_file "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}" "${PROJECT_NAME}")
 configure_file(
   ${CMAKE_CURRENT_SOURCE_DIR}/cmake/pc.in
   ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc

cmake/JoinPaths.cmake

@@ -0,0 +1,23 @@
+# This module provides function for joining paths
+# known from most languages
+#
+# SPDX-License-Identifier: (MIT OR CC0-1.0)
+# Copyright 2020 Jan Tojnar
+# https://github.com/jtojnar/cmake-snips
+#
+# Modelled after Python’s os.path.join
+# https://docs.python.org/3.7/library/os.path.html#os.path.join
+# Windows not supported
+function(join_paths joined_path first_path_segment)
+    set(temp_path "${first_path_segment}")
+    foreach(current_segment IN LISTS ARGN)
+        if(NOT ("${current_segment}" STREQUAL ""))
+            if(IS_ABSOLUTE "${current_segment}")
+                set(temp_path "${current_segment}")
+            else()
+                set(temp_path "${temp_path}/${current_segment}")
+            endif()
+        endif()
+    endforeach()
+    set(${joined_path} "${temp_path}" PARENT_SCOPE)
+endfunction()

cmake/pc.in

@@ -1,7 +1,7 @@
 prefix=@CMAKE_INSTALL_PREFIX@
-exec_prefix=${prefix}
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@/@PROJECT_NAME@
-libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
+exec_prefix=@CMAKE_INSTALL_PREFIX@
+includedir=@includedir_for_pc_file@
+libdir=@libdir_for_pc_file@
 
 Name: @PROJECT_NAME@
 Description: Simple C library offering ini file parsing services