cmake: Support sccache

Signed-off-by: Zack Cerza <[email protected]>

Author: zmc

CMakeLists.txt

@@ -83,6 +83,21 @@ if(WITH_CCACHE)
   endif()
 endif(WITH_CCACHE)
 
+option(WITH_SCCACHE "Build with sccache.")
+if(WITH_SCCACHE)
+  if(CMAKE_C_COMPILER_LAUNCHER OR CMAKE_CXX_COMPILER_LAUNCHER)
+    message(WARNING "Compiler launcher already set. stop configuring sccache")
+  else()
+    find_program(SCCACHE_EXECUTABLE sccache)
+    if(NOT SCCACHE_EXECUTABLE)
+      message(FATAL_ERROR "Can't find sccache. Is it installed?")
+    endif()
+    message(STATUS "Building with sccache: ${SCCACHE_EXECUTABLE}, SCCACHE_CONF=$ENV{SCCACHE_CONF}")
+    set(CMAKE_C_COMPILER_LAUNCHER ${SCCACHE_EXECUTABLE})
+    set(CMAKE_CXX_COMPILER_LAUNCHER ${SCCACHE_EXECUTABLE})
+  endif()
+endif(WITH_SCCACHE)
+
 option(WITH_MANPAGE "Build man pages." ON)
 if(WITH_MANPAGE)
   find_program(SPHINX_BUILD

do_cmake.sh

@@ -58,7 +58,10 @@ fi
 
 ARGS+=" -DWITH_PYTHON3=${PYBUILD}"
 
-if type ccache > /dev/null 2>&1 ; then
+if type sccache > /dev/null 2>&1 ; then
+    echo "enabling sccache"
+    ARGS+=" -DWITH_SCCACHE=ON"
+elif type ccache > /dev/null 2>&1 ; then
     echo "enabling ccache"
     ARGS+=" -DWITH_CCACHE=ON"
 fi