[Bug target/47829] New: no .eh_frame_hdr table will be created.

[kargl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47829

           Summary: no .eh_frame_hdr table will be created.
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: kargl@gcc.gnu.org


FreeBSD updated its ancient version of in-system binutils
to 2.17.  In doing so, an assert is firing in ld.  The 
problem was addressed in the in FreeBSD's ancient gcc with 
this commit

--------------------------------------------------------------
laptop:root[211] svn log -r 209294 | more
------------------------------------------------------------------------
r209294 | kib | 2010-06-18 04:09:51 -0700 (Fri, 18 Jun 2010) | 16 lines

Often reported issue with newer ld is:
error in /usr/lib/crtendS.o(.eh_frame); no .eh_frame_hdr table will be created.

The issue is that crtend is compiled with unwind table, and also it
places the special CIE into the .eh_frame indicating the end of section,
that is located before generated unwind table. New ld has assertion that
verifies that closing CIE is indeed the last CIE, causing the crypting
message to be issued, and refusing to generate dwarf unwind.

Add -fno-asynchronous-unwind-tables to disable unwind table generation
for crtbegin/crtend. While there, disable omitting the frame pointer [1].


This patch fixes the issue for GCC trunk on i686-*-freebsd.

laptop:kargl[246] svn diff gcc/config.gcc
Index: gcc/config.gcc
===================================================================
--- gcc/config.gcc      (revision 170344)
+++ gcc/config.gcc      (working copy)
@@ -1210,6 +1210,7 @@ x86_64-*-elf*)
        ;;
 i[34567]86-*-freebsd*)
        tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h
${fbsd_tm_file} i386/freebsd.h"
+       tmake_file="${tmake_file} i386/t-crtstuff"
        ;;
 x86_64-*-freebsd*)
        tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h
${fbsd_tm_file} i386/x86-64.h i386/freebsd.h i386/freebsd64.h"