build: Add ccache option to CMake config

This is totally optional, but lets people build this repo with ccache to improve rebuild speeds. It also can help a great deal on ccache-enabled CI systems like Travis-CI. We build fixed revisions of glslang a lot on Travis, so this will be a big help with CI machine loading.

build: Add ccache option to CMake config
23770b9a · Karl Schultz · cd57b4ba · 23770b9a
Commit 23770b9a authored Jul 06, 2018 by Karl Schultz
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CMakeLists.txt CMakeLists.txt +8 -0

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--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,6 +35,14 @@ if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT AND WIN32)
    set(CMAKE_INSTALL_PREFIX "install" CACHE STRING "..." FORCE)
 endif()

+option(USE_CCACHE "Use ccache" OFF)
+if(USE_CCACHE)
+    find_program(CCACHE_FOUND ccache)
+    if(CCACHE_FOUND)
+        set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
+    endif(CCACHE_FOUND)
+endif()
+
 project(glslang)
 # make testing optional
 include(CTest)