rs6000: Add Rust support to traceback table

Use 0 for the "lang" identifier for Rust, just like we do for all other
source languages without assigned language code (0 means "C").

Tested on powerpc64-linux.  Without this patch there are ICEs galore in
the gm2 testsuite for 64-bit Linux targets, and with the ptch there are
just a few FAILs.

2022-12-17  Segher Boessenkool  <segher@kernel.crashing.org>

	* config/rs6000/rs6000-logue.cc (rs6000_output_function_epilogue):
	Handle GNU Rust for the tbtab lang field.

diff --git a/gcc/config/rs6000/rs6000-logue.cc b/gcc/config/rs6000/rs6000-logue.cc
index 3621cb5..669a258 100644 (file)
--- a/gcc/config/rs6000/rs6000-logue.cc
+++ b/gcc/config/rs6000/rs6000-logue.cc
@@ -5350,6 +5350,7 @@ rs6000_output_function_epilogue (FILE *file)
          || ! strcmp (language_string, "GNU GIMPLE")
          || ! strcmp (language_string, "GNU Go")
          || ! strcmp (language_string, "GNU D")
+         || ! strcmp (language_string, "GNU Rust")
          || ! strcmp (language_string, "libgccjit"))
        i = 0;
       else if (! strcmp (language_string, "GNU F77")