re PR go/64595 (go programs abort when debug info is stripped)

	PR go/64595
	* go-lang.c (go_langhook_init_options_struct): Set default
	debug_info_level.
	(go_langhook_post_options): If debug_info_level is still the
	default, make sure write_symbols is set.
	* gccgo.texi (Invoking gccgo): Document that -g1 is the default.

From-SVN: r220064

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/go/go-lang.c b/gcc/go/go-lang.c
index 2797e99..fe5b583 100644
--- a/gcc/go/go-lang.c
+++ b/gcc/go/go-lang.c
@@ -171,6 +171,12 @@ go_langhook_init_options_struct (struct gcc_options *opts)
   /* Exceptions are used to handle recovering from panics.  */
   opts->x_flag_exceptions = 1;
   opts->x_flag_non_call_exceptions = 1;
+
+  /* Go programs expect runtime.Callers to work, and that uses
+     libbacktrace that uses debug info.  Set the debug info level to 1
+     by default.  In post_options we will set the debug type if the
+     debug info level was not set back to 0 on the command line.  */
+  opts->x_debug_info_level = DINFO_LEVEL_TERSE;
 }
 
 /* Infrastructure for a vector of char * pointers.  */
@@ -289,6 +295,12 @@ go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
   if (!global_options_set.x_flag_optimize_sibling_calls)
     global_options.x_flag_optimize_sibling_calls = 0;
 
+  /* If the debug info level is still 1, as set in init_options, make
+     sure that some debugging type is selected.  */
+  if (global_options.x_debug_info_level == DINFO_LEVEL_TERSE
+      && global_options.x_write_symbols == NO_DEBUG)
+    global_options.x_write_symbols = PREFERRED_DEBUGGING_TYPE;
+
   /* Returning false means that the backend should be used.  */
   return false;
 }