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[google/integration] Add -Xclang-only option (issue6047048)

To be submitted to the google/integration branch and merged into

Add -Xclang-only option (which is ignored).

This is used by certain drivers to pass options selectively to clang.  Adding
support to the gcc driver makes it easier to test GCC in the absence of these

Google ref 6302116.

2012-04-17   Ollie Wild  <>

	* gcc/common.opt (Xclang-only): New option.
	* gcc/doc/invoke.texi (Xclang-only): Document new option.
	* gcc/gcc.c (display_help): Print new option.
	(driver_handle_option): Support new option (ignoring args).

diff --git a/gcc/common.opt b/gcc/common.opt
index 4a751a9..39f0843 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -743,6 +743,9 @@ Warn when a vector operation is compiled outside the SIMD
 Driver Separate
+Driver Joined
 Driver Separate
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index d980e9f..1b61e76 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -9560,6 +9560,11 @@ systems using the GNU linker.  On some targets, such as bare-board
 targets without an operating system, the @option{-T} option may be required
 when linking to avoid references to undefined symbols.
+@item -Xclang-only @var{option}
+@opindex Xclang-only
+Ignore @var{option}.  This is used by some custom drivers to pass options
+to Clang but not GCC.
 @item -Xlinker @var{option}
 @opindex Xlinker
 Pass @var{option} as an option to the linker.  You can use this to
diff --git a/gcc/gcc.c b/gcc/gcc.c
index 5f789fd..c6b48a6 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -2983,6 +2983,7 @@ display_help (void)
   fputs (_("  -Xassembler <arg>        Pass <arg> on to the assembler\n"), stdout);
   fputs (_("  -Xpreprocessor <arg>     Pass <arg> on to the preprocessor\n"), stdout);
   fputs (_("  -Xlinker <arg>           Pass <arg> on to the linker\n"), stdout);
+  fputs (_("  -Xclang-only=<arg>       Ignore <arg>\n"), stdout);
   fputs (_("  -save-temps              Do not delete intermediate files\n"), stdout);
   fputs (_("  -save-temps=<arg>        Do not delete intermediate files\n"), stdout);
   fputs (_("\
@@ -3353,6 +3354,11 @@ driver_handle_option (struct gcc_options *opts,
       do_save = false;
+    case OPT_Xclang_only:
+      /* Ignore the argument.  Used by some drivers to selectively pass
+         arguments to clang.  */
+      break;
     case OPT_Xlinker:
       add_infile (arg, "*");
       do_save = false;

This patch is available for review at

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