From bd63f3d8f2bfc9576e4b42d4cfb1fac5e091fefe Mon Sep 17 00:00:00 2001
From: Roberto Di Remigio <roberto.d.remigio@uit.no>
Date: Thu, 8 Oct 2015 12:23:35 +0200
Subject: [PATCH] Add module for ccache support.

It's based on information retrieved from:
https://www.virag.si/2015/07/use-ccache-with-cmake-for-faster-compilation/
http://petereisentraut.blogspot.no/2011/05/ccache-and-clang.html
---
 modules/ccache.cmake | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 modules/ccache.cmake

diff --git a/modules/ccache.cmake b/modules/ccache.cmake
new file mode 100644
index 0000000..ced3027
--- /dev/null
+++ b/modules/ccache.cmake
@@ -0,0 +1,27 @@
+#.rst:
+#
+# Adds ccache support.
+# The user should export the appropriate environment variables to
+# tweak the program's behaviour, as described in its manpage.
+# Notice that some additional compiler flags might be needed in order
+# to avoid unnecessary warnings.
+#
+# Variables defined::
+#
+#   CCACHE_FOUND
+#
+# autocmake.cfg configuration::
+#
+#   docopt: --ccache=<USE_CCACHE> Toggle use of ccache <ON/OFF> [default: ON].
+#   define: '-DUSE_CCACHE="{0}"'.format(arguments['--ccache'])
+
+if(USE_CCACHE)
+    find_program(CCACHE_FOUND ccache)
+    if(CCACHE_FOUND)
+        set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
+        set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
+        message(STATUS "Compiling with ccache")
+    else()
+        message(STATUS "ccache not available")
+    endif()
+endif()