[Bug c++/57897] Target x86_64-w64-mingw32 failed with '-mno-fentry isn't compatible with SEH'

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57897

Kai Tietz <ktietz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-12-06
     Ever confirmed|0                           |1

--- Comment #7 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Issue is that for SEH-target we need to generate dw2 unwind-information so that
-fasynchronous-unwind-tables works proper.

Following patch should fix that:

Index: i386.c
===================================================================
--- i386.c      (Revision 205719)
+++ i386.c      (Arbeitskopie)
@@ -3698,6 +3698,9 @@ ix86_option_override_internal (bool main_args_p,
     {
       if (opts->x_optimize >= 1 && !opts_set->x_flag_omit_frame_pointer)
        opts->x_flag_omit_frame_pointer = !USE_X86_64_FRAME_POINTER;
+      if (opts->x_flag_asynchronous_unwind_tables == 1
+         && TARGET_SEH)
+       opts->x_flag_unwind_tables = 1;
       if (opts->x_flag_asynchronous_unwind_tables == 2)
        opts->x_flag_unwind_tables
          = opts->x_flag_asynchronous_unwind_tables = 1;