Date: Sun, 25 Feb 2001 20:50:04 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Peter Wemm <peter@FreeBSD.org> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/conf Makefile.alpha Makefile.i386 Makefile.pc98 Message-ID: <Pine.BSF.4.21.0102252031180.6924-100000@besplex.bde.org> In-Reply-To: <200102250751.f1P7pLd95579@freefall.freebsd.org>
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On Sat, 24 Feb 2001, Peter Wemm wrote:
> peter 2001/02/24 23:51:21 PST
>
> Modified files:
> sys/conf Makefile.alpha Makefile.i386
> Makefile.pc98
> Log:
> genassym.sh does not work with a.out because the sizes are rounded up
> by the compiler. ie: char foo[0] comes out as 4 bytes on a.out, and
> we depended on it coming out as 0 for the script version. :-(
>
> Make double sure that genassym.o is built and nm'ed in elf mode.
Thanks for fixing all this.
I knew about the genassym.sh problem, but ISTR testing genassym.sh for
aout. I think the rounding up is new behaviour. My version of the aout
ld does alignment/padding stuff that is moot with the current behaviour.
Possible fix for genassym.sh: use initialized arrays. This stuff is more
unportable than I first thought. gcc does the right thing with the
following broken code:
char x[0] = {};
char y[0] = { 0 }; /* Excess initializers not reported! */
char z[1] = {};
but Tendra C rejects all of these (0-sized arrays aren't in C90, and
aggregate initializers must be non-empty in C).
Bruce
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