Print compiler and linker version with the version command

After years of unsuccessful research I've finally shamelessly stolen other
peoples intellectual properties to present the all-new and world-changing
updated version command:
-
U-Boot>> version

U-Boot 2010.12-00014-g7435056-dirty (Jan 18 2011 - 23:19:38)
MyBoard
gcc (GCC) 0.42 (Distro foobar)
GNU ld (GNU Binutils) 0.314159265
-
May the toolchain bugs rest in peace.

Signed-off-by: Alexander Holler <holler@ahsoftware.de>

Makefile

@@ -416,6 +416,10 @@ $(U_BOOT_ONENAND):	$(ONENAND_IPL) $(obj)u-boot.bin
 $(VERSION_FILE):
 		@( printf '#define U_BOOT_VERSION "U-Boot %s%s"\n' "$(U_BOOT_VERSION)" \
 		 '$(shell $(TOPDIR)/tools/setlocalversion $(TOPDIR))' ) > $@.tmp
+		@( printf '#define CC_VERSION_STRING "%s"\n' \
+		 '$(shell $(CC) --version | head -n 1)' )>>  $@.tmp
+		@( printf '#define LD_VERSION_STRING "%s"\n' \
+		 '$(shell $(LD) -v | head -n 1)' )>>  $@.tmp
 		@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
 
 $(TIMESTAMP_FILE):

common/cmd_version.c

@@ -23,18 +23,25 @@
 
 #include <common.h>
 #include <command.h>
+#include <version.h>
 
 extern char version_string[];
 
 int do_version(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	printf("\n%s\n", version_string);
+#ifdef CC_VERSION_STRING
+	puts(CC_VERSION_STRING "\n");
+#endif
+#ifdef LD_VERSION_STRING
+	puts(LD_VERSION_STRING "\n");
+#endif
 
 	return 0;
 }
 
 U_BOOT_CMD(
 	version,	1,		1,	do_version,
-	"print monitor version",
+	"print monitor, compiler and linker version",
 	""
 );