Re: bootstrap/3867: [djgpp] eh_frame optimization check inconfigure is broken

[Tim Van Holder <tim dot van dot holder at pandora dot be>]

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3867

Patch (well, more of a hack) is attached.

However, I do not know whether .long and .4byte are necessarily
equivalent (I suspect they won't be on 64-bit hosts), so I left
in checks for both .4byte and .long.  Also, I left out the
 ,"aw",@progbits
args for .section, and I'm not sure that this won't affect the tests
on some platforms (it doesn't on Linux, but that's the only non-COFF
platform I have access to).
Additionally, I'm not entirely sure that checking for lit2 and big2
is valid (for all I know the extra padding is exactly the failure
being detected).  Someone with exact knowledge of the issue being
checked here will need to verify it.
In any case, this patch causes configure to consider mingw32, using
binutils 2.13, a non-broken platform when it comes to assembler
eh_frame optimizations.

Note: the use of .4byte in the linker test is safe, as it is only
run if the linker supports PT_GNU_EH_FRAME, and that is currently
only the case if the linker supports elf.

-- 
Tim Van Holder <tim.van.holder@pandora.be>

Attachment: eh_frame.patch
Description: Text document