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[PATCH,AIX] Nil check size threshold control for AIX


Description:
 * This patch tells the Go frontend to insert explicit guards (check for nil -> panic) for AIX since relying on a fault does not work on AIX for page 0.

Tests:
 * AIX: Build: SUCCESS
   - build made by means of gmake.

ChangeLog:
  * go-lang.c (go_langhook_init): Handle AIX case for nil_check_size_threshold.


Cordialement,

Tony Reix

ATOS / Bull SAS
ATOS Expert
IBM Coop Architect & Technical Leader

Office : +33 (0) 4 76 29 72 67
1 rue de Provence - 38432 Échirolles - France
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Index: gcc/go/go-lang.c
===================================================================
--- ./gcc/go/go-lang.c	(revision 255466)
+++ ./gcc/go/go-lang.c	(working copy)
@@ -112,7 +112,11 @@ go_langhook_init (void)
   args.check_divide_overflow = go_check_divide_overflow;
   args.compiling_runtime = go_compiling_runtime;
   args.debug_escape_level = go_debug_escape_level;
+#ifdef TARGET_AIX
+  args.nil_check_size_threshold = -1;
+#else
   args.nil_check_size_threshold = 4096;
+#endif
   args.linemap = go_get_linemap();
   args.backend = go_get_backend();
   go_create_gogo (&args);

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