[PATCH] ctf: Do not warn for CTF not supported for GNU GIMPLE

[Indu Bhagat <indu.bhagat@oracle.com>]

CTF is supported for C only.  Currently, a warning is emitted if the -gctf
command line option is specified for a non-C frontend.  This warning is also
used by the GCC testsuite framework - it skips adding -gctf to the list of
debug flags for automated testing, if CTF is not supported for the frontend.

The following warning, however, is not useful in case of LTO:

"lto1: note: CTF debug info requested, but not supported for ‘GNU GIMPLE’
frontend"

This patch disables the generation of the above warning for GNU GIMPLE.

Bootstrapped and regression tested on x86_64.

gcc/ChangeLog:

	* toplev.c (process_options): Do not warn for GNU GIMPLE.
---
 gcc/toplev.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/gcc/toplev.c b/gcc/toplev.c
index e1688aa..511a343 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -1416,14 +1416,16 @@ process_options (void)
 	debug_info_level = DINFO_LEVEL_NONE;
     }
 
-  /* CTF is supported for only C at this time.
-     Compiling with -flto results in frontend language of GNU GIMPLE.  */
+  /* CTF is supported for only C at this time.  */
   if (!lang_GNU_C ()
       && ctf_debug_info_level > CTFINFO_LEVEL_NONE)
     {
-      inform (UNKNOWN_LOCATION,
-	      "CTF debug info requested, but not supported for %qs frontend",
-	      language_string);
+      /* Compiling with -flto results in frontend language of GNU GIMPLE.  It
+	 is not useful to warn in that case.  */
+      if (!startswith (lang_hooks.name, "GNU GIMPLE"))
+	inform (UNKNOWN_LOCATION,
+		"CTF debug info requested, but not supported for %qs frontend",
+		language_string);
       ctf_debug_info_level = CTFINFO_LEVEL_NONE;
     }
 
-- 
1.8.3.1