From a7d83b701f64654d41d5828ce3cd2eb0db68cdd6 Mon Sep 17 00:00:00 2001
From: "Daniel J. Hofmann" <daniel@trvx.org>
Date: Fri, 26 Feb 2016 07:34:18 +0100
Subject: [PATCH] Provides a CMake variable to disable ccache usage

---
 CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 268676fa9..47b7a2ea8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,6 +29,7 @@ if(WIN32 AND MSVC_VERSION LESS 1800)
   message(FATAL_ERROR "Building with Microsoft compiler needs Visual Studio 2013 or later (Express version works too)")
 endif()
 
+option(ENABLE_CCACHE "Speed up incremental rebuilds via ccache" ON)
 option(ENABLE_JSON_LOGGING "Adds additional JSON debug logging to the response" OFF)
 option(BUILD_TOOLS "Build OSRM tools" OFF)
 option(ENABLE_ASSERTIONS OFF)
@@ -421,7 +422,7 @@ COMMENT "Generating API documentation with Doxygen" VERBATIM
 endif()
 
 # prefix compilation with ccache by default if available and on clang or gcc
-if(${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
+if(ENABLE_CCACHE AND (${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU"))
   find_program(CCACHE_FOUND ccache)
   if(CCACHE_FOUND)
     message(STATUS "Using ccache to speed up incremental builds")