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Re: cygwin gcc 3.4 and cygwin
- From: Danny Smith <danny_r_smith_2001 at yahoo dot co dot nz>
- To: Brian Ford <ford at vss dot fsi dot com>, cygwin at cygwin dot com
- Date: Mon, 17 Mar 2003 13:21:06 +1100 (EST)
- Subject: Re: cygwin gcc 3.4 and cygwin
--- Danny Smith <danny_r_smith_2001 at yahoo dot co dot nz> wrote: > Brian Ford wrote:
> > Vanilla gcc 3.2.x is NOT ABI compatible with Cygwin's pre 3.2 gcc, fact.
> > I wanted to know why this was allowed to persist given the simple patch
> > required to fix it, question. I had seen Mr. Faylor make statements
> > before to the effect of: doubles in structures are not that common so who
> > cares, so I advised caution in his use of that compiler for official
> > Cygwin released software.
> Regarding the structure alignment problem:
> Adding -malign-double to compile switches should provide
> The other fix is to rebuild gcc from sources so that -malign-double is the
> default (as it is now on trunk for cygwin).
> Mr. Danny
Before gcc 3.x, struct alignemnt was not controlled by MASK_ALIGN_DOUBLE, but
by another define (BIGGEST_FIELD_ALIGNMENT) which made 64 bit alignment default
for MSVC compat.
That changed on ???.
MASK_ALIGN_DOUBLE was made default on cygwin branch on 2002-07-05
It is _not_ default on 3.2.x FSF branches.
MASK_ALIGN_DOUBLE was made default for cygwin on FSF 3.3 branch and trunk (3.4)
If someone cares to submit patch for gcc 3.2.3 branch, feel free.
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