[Bug bootstrap/81033] [8 Regression] Revision r249019 breaks bootstrap on darwin

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81033

--- Comment #10 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The last patch in comment 8 exposes another problem: buf[128] is too small.

The following patch which uses the trick proposed in IRC by Richi to split
assemble_name_raw seems to work

--- ../_clean/gcc/config/darwin.c       2017-01-01 17:39:06.000000000 +0100
+++ gcc/config/darwin.c 2017-07-03 14:21:19.000000000 +0200
@@ -3683,11 +3683,9 @@ default_function_sections:
 void
 darwin_function_switched_text_sections (FILE *fp, tree decl, bool new_is_cold)
 {
-  char buf[128];
-  snprintf (buf, 128, "%s%s",new_is_cold?"__cold_sect_of_":"__hot_sect_of_",
-           IDENTIFIER_POINTER (DECL_NAME (decl)));
   /* Make sure we pick up all the relevant quotes etc.  */
-  assemble_name_raw (fp, (const char *) buf);
+  assemble_name_raw (fp, new_is_cold?"__cold_sect_of_":"__hot_sect_of_");
+  assemble_name_raw (fp, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
   fputs (":\n", fp);
 }