Re: diff 2.8.1 dumps core on HPUX 10.20

[Bob Proulx]

Paul Eggert <address@hidden> [2002-12-29 11:20:51 -0800]:
> > From: Jost Martin <address@hidden>
> > Date: Fri, 29 Nov 2002 11:56:00 +0100
> > 
> > I'm trying to compile diff 2.8.1 on HPUX 10.20 using the HP
> > ANSI-C-Compiler.
> > cc +DAportable -Aa +O2 -D_POSIX_SOURCE -D_HPUX_SOURCE
> > -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED -L/pd/libs/lib/ -o diff
> > analyze.o context.o diff.o dir.o ed.o ifdef.o io.o normal.o side.o
> > util.o version.o ../lib/libdiffutils.a
> > ...
> > /usr/ccs/bin/ld: (Warning) LDW instruction from file io.o(0xf0c)
> > accesses nonaligned data - check alignment options.

> Thanks for your bug report.  This sounds quite strange.  I don't know
> HP-UX, but it vaguely sounds like you are compiling with aggressive
> optimization options that break diffutils, either because of a
> compiler bug, or because the options produce an implementation that is
> too strict about type punning.

Well +O2 is pretty tame.  That is the basic optimization.  So I don't
think it is aggressive optimization.  +O3 and +O4 is where it gets
interesting.  But before that it is pretty safe.

I can't recreate the problem on my hpux 10.20 machine.  I just tried
and diff 2.8.1 works fine for me using the native hpux ansi compiler.
This was incentive for me to upgrade diffutils there.

  what /usr/bin/cc
              LINT A.10.32.10 CXREF  A.10.32.10
        HP92453-01 A.10.32.12 HP C Compiler
         /usr/lib/libc: $Revision: 76.3 $

The diffutils configure and compile fine for me.

  ./configure CC=cc CFLAGS='+O2 +DAportable'

The autotools with diff 2.8.1 know about hpux and -Ae and so no other
options are needed.  The final link line is this.

  cc -Ae +O2 +DAportable -o diff analyze.o context.o diff.o dir.o ed.o ifdef.o 
io.o normal.o side.o util.o version.o ../lib/libdiffutils.a -lintl

And then the resulting diff works fine for me.  I would be happy to
make the files available.  Either a tar.gz of the resulting binaries
or an rpm of them.

Bob