build c2str.exe with the host compiler; default it to gcc if cross prefix given

Makefile

@@ -256,7 +256,7 @@ endif
 	$S./c2str.exe $< $@
 
 c2str.exe : conftest.c
-	$S$(CC) -DC2STR $< -o $@
+	$S$(HOST_CC) -DC2STR $< -o $@
 
 # target specific object rule
 $(X)%.o : %.c $(LIBTCC_INC)

configure

@@ -58,6 +58,8 @@ build_cross=
 test -n "$CC" && cc="$CC"
 test -n "$AR" && ar="$AR"
 
+host_cc="$CC"
+
 # set default CFLAGS if unset in environment
 test -z "$CFLAGS" && CFLAGS="-Wall -O2"
 
@@ -122,7 +124,7 @@ for opt do
   ;;
   --source-path=*) assign_opt "$opt" source_path
   ;;
-  --cross-prefix=*) assign_opt "$opt" cross_prefix
+  --cross-prefix=*) assign_opt "$opt" cross_prefix; assign_opt "gcc" host_cc
   ;;
   --os-release=*) assign_opt "$opt" os_release
   ;;
@@ -584,6 +586,7 @@ mandir=\$(DESTDIR)$mandir
 infodir=\$(DESTDIR)$infodir
 docdir=\$(DESTDIR)$docdir
 CC=$cc
+HOST_CC=$host_cc
 CC_NAME=$cc_name
 GCC_MAJOR=$gcc_major
 GCC_MINOR=$gcc_minor