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

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

The following reply was made to PR bootstrap/3867; it has been noted by GNATS.

From: Tim Van Holder <tim.van.holder@pandora.be>
To: bangerth@dealii.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
	nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: bootstrap/3867: [djgpp] eh_frame optimization check in
	configure is broken
Date: 21 Nov 2002 08:58:15 +0100

 It's not a failure as such - configure merely finds the eh_frame
 optimization bug when it is not present.
 This is still the case in gcc 3.2; configure.in contains a piece
 of assembler code that uses .4byte and multiple arguments for
 .section.  Even when binutils 2.13 is used, those are NOT
 supported for coff targets (djgpp, mingw32), causing as to
 fail, and configure to assume the test failed.
 Using .long instead of .4byte and removing the extra arguments
 to .section results in an assembler file that gives the proper
 results for coff as well as ELF.
 
 The check for the linker's eh_frame header optimization is even
 more broken for those platforms, as it checks 4- and 8-byte
 alignments (using .${gc_WS}byte as pseudo-op); in that test it
 is not possible to simply replace .4byte by .long.
 
 Perhaps this is a binutils issue (perhaps as should treat .4byte
 as a synonym for .long for a COFF target, and silently ignore
 extra arguments for .section), but this has been causing gcc to
 misdetect eh_frame stuff on COFF platforms for quite a while now.
 
 -- 
 Tim Van Holder <tim.van.holder@pandora.be>