Also look for clcache for MSVC; only use wrappers for Xcode

1 files changed, 26 insertions, 44 deletions

diff --git a/cmake/Ccache.cmake b/cmake/Ccache.cmake
index 09e81756..7bc59429 100644
--- a/cmake/Ccache.cmake
+++ b/cmake/Ccache.cmake
@@ -1,66 +1,48 @@
 #
-# CMake module to support ccache
-#
-# see https://crascit.com/2016/04/09/using-ccache-with-cmake/
+# CMake module to support ccache (or clcache for MSVC)
 #
+# Copyright (c) 2021, Mike Taves <mwtoews at gmail dot com>
+
+cmake_minimum_required(VERSION 3.4)
 
-find_program(CCACHE_PROGRAM ccache)
-# Note: REQUIRED keyword introduced in CMake 3.18
 
+find_program(CCACHE_PROGRAM NAMES ccache clcache)
 if(CCACHE_PROGRAM)
   message(STATUS "Configuring ccache with ${CCACHE_PROGRAM}")
 
-  set(C_LAUNCHER   "${CCACHE_PROGRAM}")
-  set(CXX_LAUNCHER "${CCACHE_PROGRAM}")
-
-  # Set up wrapper scripts
-  set(CCACHE_LAUNCH_C ${CMAKE_BINARY_DIR}/ccache-launch-c)
-  file(WRITE ${CCACHE_LAUNCH_C} "\
+  if(CMAKE_GENERATOR STREQUAL "Xcode")
+    # see https://crascit.com/2016/04/09/using-ccache-with-cmake/
+    set(C_LAUNCHER   "${CCACHE_PROGRAM}")
+    set(CXX_LAUNCHER "${CCACHE_PROGRAM}")
+    set(CCACHE_LAUNCH_C ${CMAKE_BINARY_DIR}/ccache-c)
+    set(CCACHE_LAUNCH_CXX ${CMAKE_BINARY_DIR}/ccache-cxx)
+    file(WRITE "${CCACHE_LAUNCH_C}" "\
 #!/bin/sh
-
-# Xcode generator doesn't include the compiler as the
-# first argument, Ninja and Makefiles do. Handle both cases.
-if [ \"$1\" = \"${CMAKE_C_COMPILER}\" ] ; then
-    shift
-fi
-
-export CCACHE_CPP2=true
+shift
 exec \"${C_LAUNCHER}\" \"${CMAKE_C_COMPILER}\" \"$@\"
 ")
-
-  set(CCACHE_LAUNCH_CXX ${CMAKE_BINARY_DIR}/ccache-launch-cxx)
-  file(WRITE ${CCACHE_LAUNCH_CXX} "\
+    file(WRITE "${CCACHE_LAUNCH_CXX}" "\
 #!/bin/sh
-
-# Xcode generator doesn't include the compiler as the
-# first argument, Ninja and Makefiles do. Handle both cases.
-if [ \"$1\" = \"${CMAKE_CXX_COMPILER}\" ] ; then
-    shift
-fi
-
-export CCACHE_CPP2=true
+shift
 exec \"${CXX_LAUNCHER}\" \"${CMAKE_CXX_COMPILER}\" \"$@\"
 ")
-
-  # Note: file(CHMOD) introduced in CMake 3.19
-  execute_process(
-    COMMAND chmod a+rx
-      "${CCACHE_LAUNCH_C}"
-      "${CCACHE_LAUNCH_CXX}"
-  )
-
-  if(CMAKE_GENERATOR STREQUAL "Xcode")
+    # Note: file(CHMOD) introduced in CMake 3.19
+    execute_process(
+      COMMAND chmod a+rx
+        "${CCACHE_LAUNCH_C}"
+        "${CCACHE_LAUNCH_CXX}"
+    )
     # Set Xcode project attributes to route compilation and linking
-    # through our scripts
+    # through the wrapper scripts
     set(CMAKE_XCODE_ATTRIBUTE_CC         "${CCACHE_LAUNCH_C}")
     set(CMAKE_XCODE_ATTRIBUTE_CXX        "${CCACHE_LAUNCH_CXX}")
     set(CMAKE_XCODE_ATTRIBUTE_LD         "${CCACHE_LAUNCH_C}")
     set(CMAKE_XCODE_ATTRIBUTE_LDPLUSPLUS "${CCACHE_LAUNCH_CXX}")
   else()
-    # Support Unix Makefiles and Ninja
-    set(CMAKE_C_COMPILER_LAUNCHER   "${CCACHE_LAUNCH_C}")
-    set(CMAKE_CXX_COMPILER_LAUNCHER "${CCACHE_LAUNCH_CXX}")
+    # Most other generators (Unix Makefiles, Ninja, etc.)
+    set(CMAKE_C_COMPILER_LAUNCHER   "${CCACHE_PROGRAM}")
+    set(CMAKE_CXX_COMPILER_LAUNCHER "${CCACHE_PROGRAM}")
   endif()
 else()
-  message(SEND_ERROR "Ccache requested, but ccache was not found")
+  message(WARNING "Ccache was requested, but no program was not found")
 endif()