diagnostic.c (diagnostic_color_init): New.

gcc/ChangeLog:

2014-12-04  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	* diagnostic.c (diagnostic_color_init): New.
	* diagnostic.h: Declare.
	* gcc.c (driver::global_initializations): Use it.
	(driver_handle_option): Handle -fdiagnostics-color_.
	* toplev.c: Do not include diagnostic-color.h.
	(process_options): Do not initialize color diagnostics here.
	* common.opt (fdiagnostics-color=): Add Driver.
	* opts-global.c (init_options_once): Initialize color here.
	* opts.c (common_handle_option): Use diagnostics_color_init.
	* diagnostic-color.h: Fix comment.

From-SVN: r218406

1 files changed, 28 insertions, 0 deletions

diff --git a/gcc/diagnostic.c b/gcc/diagnostic.c
index 0c8fbe5..07ce602 100644
--- a/gcc/diagnostic.c
+++ b/gcc/diagnostic.c
@@ -155,6 +155,34 @@ diagnostic_initialize (diagnostic_context *context, int n_opts)
   context->inhibit_notes_p = false;
 }
 
+/* Maybe initialize the color support. We require clients to do this
+   explicitly, since most clients don't want color.  When called
+   without a VALUE, it initializes with DIAGNOSTICS_COLOR_DEFAULT.  */
+
+void
+diagnostic_color_init (diagnostic_context *context, int value /*= -1 */)
+{
+  /* value == -1 is the default value.  */
+  if (value < 0)
+    {
+      /* If DIAGNOSTICS_COLOR_DEFAULT is -1, default to
+	 -fdiagnostics-color=auto if GCC_COLORS is in the environment,
+	 otherwise default to -fdiagnostics-color=never, for other
+	 values default to that
+	 -fdiagnostics-color={never,auto,always}.  */
+      if (DIAGNOSTICS_COLOR_DEFAULT == -1)
+	{
+	  if (!getenv ("GCC_COLORS"))
+	    return;
+	  value = DIAGNOSTICS_COLOR_AUTO;
+	}
+      else
+	value = DIAGNOSTICS_COLOR_DEFAULT;
+    }
+  pp_show_color (context->printer)
+    = colorize_init ((diagnostic_color_rule_t) value);
+}
+
 /* Do any cleaning up required after the last diagnostic is emitted.  */
 
 void