From c24491c2c916220648802e5e711e923c7685ee9d Mon Sep 17 00:00:00 2001
From: Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
Date: Thu, 26 Mar 2015 15:59:22 +0100
Subject: Use pkg-config to determine GI support

---
 CMakeLists.txt            |  1 +
 cmake/PkgConfigVars.cmake | 30 ++++++++++++++++++++++++++++++
 src/CMakeLists.txt        | 11 ++++++++---
 3 files changed, 39 insertions(+), 3 deletions(-)
 create mode 100644 cmake/PkgConfigVars.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d04287..e4053ec 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -67,6 +67,7 @@ endmacro()
 #}}}
 #{{{ Configure
 include(ConfigurePaths)
+include(PkgConfigVars)
 configure_paths(UCA)
 
 set(UCA_PLUGINDIR "${UCA_LIBDIR}/uca")
diff --git a/cmake/PkgConfigVars.cmake b/cmake/PkgConfigVars.cmake
new file mode 100644
index 0000000..f295457
--- /dev/null
+++ b/cmake/PkgConfigVars.cmake
@@ -0,0 +1,30 @@
+# - determine variables defined in pkg-config files
+#
+# Usage:
+#   pkg_check_variable(<PKG_NAME> <VARIABLE_NAME>)
+#
+# Checks for a variable in the given package and translates to a call such as
+# `pkg-config --variable=<VARIABLE_NAME> <PKG_NAME>`. The output is a cached
+# variable named
+#
+#   <PKG_NAME>_<VARIABLE_NAME>
+#
+# Note that both names are uppercased and any dashes replaced by underscores.
+#
+
+find_package(PkgConfig REQUIRED)
+
+function(pkg_check_variable _pkg _name)
+    string(TOUPPER ${_pkg} _pkg_upper)
+    string(TOUPPER ${_name} _name_upper)
+    string(REPLACE "-" "_" _pkg_upper ${_pkg_upper})
+    string(REPLACE "-" "_" _name_upper ${_name_upper})
+    set(_output_name "${_pkg_upper}_${_name_upper}")
+
+    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()
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 3d94c98..762b308 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -62,10 +62,15 @@ endif ()
 
 #}}}
 #{{{ GObject introspection
-if (INTROSPECTION_SCANNER AND INTROSPECTION_COMPILER)
+pkg_check_modules(GOBJECT_INTROSPECTION gobject-introspection-1.0)
+
+if (GOBJECT_INTROSPECTION_FOUND)
     option(WITH_GIR "Build introspection files" ON)
 
     if (WITH_GIR)
+        pkg_check_variable(gobject-introspection-1.0 g_ir_scanner)
+        pkg_check_variable(gobject-introspection-1.0 g_ir_compiler)
+
         set(GIR_PREFIX "Uca-${UCA_ABI_VERSION}.0")
         set(GIR_XML "${GIR_PREFIX}.gir")
         set(GIR_TYPELIB "${GIR_PREFIX}.typelib")
@@ -79,7 +84,7 @@ if (INTROSPECTION_SCANNER AND INTROSPECTION_COMPILER)
         list(APPEND _gir_input "${CMAKE_CURRENT_BINARY_DIR}/uca-enums.c")
 
         add_custom_command(OUTPUT ${GIR_XML}
-            COMMAND ${INTROSPECTION_SCANNER}
+            COMMAND ${GOBJECT_INTROSPECTION_1.0_G_IR_SCANNER}
                     --namespace=Uca
                     --nsversion=${UCA_ABI_VERSION}
                     --library=uca
@@ -94,7 +99,7 @@ if (INTROSPECTION_SCANNER AND INTROSPECTION_COMPILER)
             WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
 
         add_custom_command(OUTPUT ${GIR_TYPELIB}
-            COMMAND ${INTROSPECTION_COMPILER}
+            COMMAND ${GOBJECT_INTROSPECTION_1.0_G_IR_COMPILER}
                     -o ${GIR_TYPELIB}
                     ${GIR_XML}
             DEPENDS ${GIR_XML}
-- 
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