From e01798d1ed4df147c7eca0bbc16d95d80becc9a8 Mon Sep 17 00:00:00 2001
From: Alessio Morale <alessiomorale@gmail.com>
Date: Fri, 17 Jul 2015 23:21:01 +0200
Subject: [PATCH] LP-41 - Add support for ccache - explicitly define QMAKE_CC &
 CXX as "ccache <compiler>" - use ccache for uavobjectgenerator - Handle
 CCACHE setting with configuration options

To enable ccache you need to configure it like
  make CCACHE=/path/to/ccache config_append
---
 ground/openpilotgcs/openpilotgcs.pri       | 6 ++++++
 ground/uavobjgenerator/uavobjgenerator.pro | 4 ++++
 make/firmware-defs.mk                      | 4 ++--
 make/tools.mk                              | 2 ++
 4 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/ground/openpilotgcs/openpilotgcs.pri b/ground/openpilotgcs/openpilotgcs.pri
index 525b8a63f..caecdbf50 100644
--- a/ground/openpilotgcs/openpilotgcs.pri
+++ b/ground/openpilotgcs/openpilotgcs.pri
@@ -248,3 +248,9 @@ macx {
         QMAKE_CXXFLAGS_WARN_ON += -Wno-gnu-static-float-init
     }
 }
+
+
+# use ccache when available
+QMAKE_CC = $$(CCACHE) $$QMAKE_CC
+QMAKE_CXX = $$(CCACHE) $$QMAKE_CXX
+
diff --git a/ground/uavobjgenerator/uavobjgenerator.pro b/ground/uavobjgenerator/uavobjgenerator.pro
index ae8c9fd25..4a03832df 100644
--- a/ground/uavobjgenerator/uavobjgenerator.pro
+++ b/ground/uavobjgenerator/uavobjgenerator.pro
@@ -8,6 +8,10 @@ QT -= gui
 macx {
     QMAKE_CXXFLAGS  += -fpermissive
 }
+# use ccache when available
+QMAKE_CC = $$(CCACHE) $$QMAKE_CC
+QMAKE_CXX = $$(CCACHE) $$QMAKE_CXX
+
 TARGET = uavobjgenerator
 CONFIG += console
 CONFIG -= app_bundle
diff --git a/make/firmware-defs.mk b/make/firmware-defs.mk
index ee434895d..ec1a0e1a9 100644
--- a/make/firmware-defs.mk
+++ b/make/firmware-defs.mk
@@ -21,8 +21,8 @@ ifndef TOP_LEVEL_MAKEFILE
 endif
 
 # Define toolchain component names.
-CC      = $(ARM_SDK_PREFIX)gcc
-CXX     = $(ARM_SDK_PREFIX)g++
+CC      = $(CCACHE) $(ARM_SDK_PREFIX)gcc
+CXX     = $(CCACHE) $(ARM_SDK_PREFIX)g++
 AR      = $(ARM_SDK_PREFIX)ar
 OBJCOPY = $(ARM_SDK_PREFIX)objcopy
 OBJDUMP = $(ARM_SDK_PREFIX)objdump
diff --git a/make/tools.mk b/make/tools.mk
index aa7f79ab7..6eb15d5fd 100644
--- a/make/tools.mk
+++ b/make/tools.mk
@@ -204,6 +204,8 @@ endif
 # Command to extract version info data from the repository and source tree
 export VERSION_INFO = $(PYTHON) $(ROOT_DIR)/make/scripts/version-info.py --path=$(ROOT_DIR)
 
+export CCACHE
+
 ##############################
 #
 # Misc settings