Use ccache if available

scripts/automator/build/clang-defaults

@@ -1,6 +1,6 @@
 # Tool overrides
-cc="clang${postfix}"
-cxx="clang++${postfix}"
+cc="${ccache}clang${postfix}"
+cxx="${ccache}clang++${postfix}"
 
 # Flag additions
 TYPES+=(debug warnmore profile)

scripts/automator/build/compiler-defaults

@@ -13,3 +13,19 @@ libs=("")
 # Builds for all compilers
 TYPES=(release)
 cflags_release=("${cflags[@]}" -DNDEBUG)
+
+# Use ccache if it's available
+if command -v ccache &> /dev/null; then
+	ccache="ccache "
+	# share the cache results
+	export CCACHE_UMASK="002"
+	# compress cache results
+	if [[ -z "${CCACHE_HARDLINK:-}" ]]; then
+		export CCACHE_COMPRESS=1
+	fi
+	# cache pre-compiled headers
+	export CCACHE_SLOPPINESS="time_macros"
+	cflags+=(-fpch-preprocess)
+else
+	ccache=""
+fi

scripts/automator/build/gcc-defaults

@@ -1,7 +1,7 @@
 # Tool overrides
 ar="gcc-ar${postfix}"
-cc="gcc${postfix}"
-cxx="g++${postfix}"
+cc="${ccache}gcc${postfix}"
+cxx="${ccache}g++${postfix}"
 ld="gcc${postfix}"
 ranlib="gcc-ranlib${postfix}"
 

scripts/automator/build/os-defaults

@@ -8,7 +8,7 @@ dependencies=(ldd "${executable}")
 function pre_build() {
 	cd ../..
 	underline "Environment"
-	echo "[$("${CC}" --version | head -1)]"
+	echo "[$(${CC} --version | head -1)]"
 	for v in "${VARIABLES[@]}"; do
 		vupper=$(upper "${v}")
 		echo "${vupper}=\"$(eval echo \$"${vupper}")\""