ctf: Do not warn for CTF not supported for GNU GIMPLE

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.

gcc/ChangeLog:

	* toplev.c (process_options): Do not warn for GNU GIMPLE.

diff --git a/gcc/toplev.c b/gcc/toplev.c
index ecb2b694970cdb9672c8da63d421495a54129808..1bb1794be964df8468c9993d8d59ab85b27d3bf0 100644 (file)
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -1408,14 +1408,16 @@ process_options (bool no_backend)
        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;
     }