Support Mac OS X host.

gnu/dist/toolchain/gcc/config/x-darwin

@@ -0,0 +1,8 @@
+# configuration for Darwin host
+
+# Show we need to use the C version of ALLOCA
+ALLOCA=alloca.o
+
+# Some of the code in GCC makes Darwin's pre-compiled header support
+# croak; disable it.
+X_CFLAGS = -no-cpp-precomp

gnu/dist/toolchain/gcc/configure

@@ -5093,6 +5093,10 @@ for machine in $build $host $target; do
 	romp-*-openbsd*)
 		# Nothing special
 		;;
+	powerpc-*-darwin*)
+		xmake_file=x-darwin
+		xm_file="rs6000/xm-sysv4.h"
+		;;
 	powerpc-*-netbsd*)
 		tmake_file="${tmake_file} rs6000/t-rs6000"
 		xm_file="rs6000/xm-sysv4.h xm-netbsd.h"

gnu/dist/toolchain/gcc/configure.in

@@ -2781,6 +2781,10 @@ changequote([,])dnl
 	romp-*-openbsd*)
 		# Nothing special
 		;;
+	powerpc-*-darwin*)
+		xmake_file=x-darwin
+		xm_file="rs6000/xm-sysv4.h"
+		;;
 	powerpc-*-netbsd*)
 		tmake_file="${tmake_file} rs6000/t-rs6000"
 		xm_file="rs6000/xm-sysv4.h xm-netbsd.h"