build-sys: Provide a simple CMake Config setup (similar to pkgconfig)

I'd rather not have to do this, as I don't really see the point in
duplicating what is done in pkgconfig, but this is likely the
easiest way to avoid nasty hacks.

Author: Colin Guthrie

Makefile.am

@@ -51,6 +51,9 @@ pkgconfig_DATA += \
 	 libpulse-mainloop-glib.pc
 endif
 
+cmakedir = $(libdir)/cmake/PulseAudio
+cmake_DATA = PulseAudioConfig.cmake PulseAudioConfigVersion.cmake
+
 homepage: all dist doxygen
 	test -d $$HOME/homepage/private
 	mkdir -p $$HOME/homepage/private/projects/pulseaudio $$HOME/homepage/private/projects/pulseaudio/doxygen

PulseAudioConfig.cmake.in

@@ -0,0 +1,12 @@
+set(PULSEAUDIO_FOUND TRUE)
+
+set(PULSEAUDIO_VERSION_MAJOR @PA_MAJOR@)
+set(PULSEAUDIO_VERSION_MINOR @PA_MINOR@)
+set(PULSEAUDIO_VERSION @PA_MAJOR@.@PA_MINOR@)
+set(PULSEAUDIO_VERSION_STRING "@PA_MAJOR@.@PA_MINOR@")
+
+find_path(PULSEAUDIO_INCLUDE_DIR pulse/pulseaudio.h HINTS "@PA_INCDIR@")
+find_library(PULSEAUDIO_LIBRARY NAMES pulse libpulse HINTS "@PA_LIBDIR@")
+ifelse(@HAVE_GLIB20@, 1, dnl
+find_library(PULSEAUDIO_MAINLOOP_LIBRARY NAMES pulse-mainloop-glib libpulse-mainloop-glib HINTS "@PA_LIBDIR@")
+)dnl

PulseAudioConfigVersion.cmake.in

@@ -0,0 +1,11 @@
+set(PACKAGE_VERSION @PA_MAJOR@.@PA_MINOR@)
+
+if("${PACKAGE_VERSION}" VERSION_LESS "${PACKAGE_FIND_VERSION}" )
+  set(PACKAGE_VERSION_COMPATIBLE FALSE)
+else("${PACKAGE_VERSION}" VERSION_LESS "${PACKAGE_FIND_VERSION}" )
+  set(PACKAGE_VERSION_COMPATIBLE TRUE)
+  if( "${PACKAGE_FIND_VERSION}" STREQUAL "${PACKAGE_VERSION}")
+    set(PACKAGE_VERSION_EXACT TRUE)
+  endif( "${PACKAGE_FIND_VERSION}" STREQUAL "${PACKAGE_VERSION}")
+endif("${PACKAGE_VERSION}" VERSION_LESS "${PACKAGE_FIND_VERSION}" )
+

configure.ac

@@ -779,6 +779,7 @@ AS_IF([test "x$enable_glib2" = "xyes" && test "x$HAVE_GLIB20" = "x0"],
 
 AC_SUBST(GLIB20_CFLAGS)
 AC_SUBST(GLIB20_LIBS)
+AC_SUBST(HAVE_GLIB20)
 AM_CONDITIONAL([HAVE_GLIB20], [test "x$HAVE_GLIB20" = x1])
 AS_IF([test "x$HAVE_GLIB20" = "x1"], AC_DEFINE([HAVE_GLIB], 1, [Have GLIB?]))
 
@@ -1263,6 +1264,16 @@ AC_CONFIG_FILES([src/default.pa:src/daemon/default.pa.in],
 AC_CONFIG_FILES([src/system.pa:src/daemon/system.pa.in],
     [m4 src/system.pa > src/system.pa.gen && mv src/system.pa.gen src/system.pa])
 
+# CMake related ProjectConfig files
+PA_LIBDIR="$libdir"
+AX_DEFINE_DIR(PA_LIBDIR, PA_LIBDIR, [PulseAudio library dir])
+PA_INCDIR="$includedir"
+AX_DEFINE_DIR(PA_INCDIR, PA_INCDIR, [PulseAudio include dir])
+
+AC_CONFIG_FILES([PulseAudioConfig.cmake:PulseAudioConfig.cmake.in],
+    [m4 PulseAudioConfig.cmake > PulseAudioConfig.cmake.gen && mv PulseAudioConfig.cmake.gen PulseAudioConfig.cmake])
+AC_CONFIG_FILES([PulseAudioConfigVersion.cmake])
+
 AC_OUTPUT
 
 # ==========================================================================