From: nesius <nesius@...>
Date: 2004-09-01T06:06:34+09:00
Subject: Re: Followup on HPUX build issue



On Wed, 1 Sep 2004, nesius wrote:

>
>
> On Tue, 31 Aug 2004 nobu.nokada@softhome.net wrote:
>
> > Hi,
> >
> > At Tue, 31 Aug 2004 11:19:03 +0900,
> > Robert Nesius wrote in [ruby-talk:111049]:
> > > It looks like the problem is that the Makefile for ext/pty defines in
> > > CPP_FLAGS -DHAVE_GLIBC or -DHAVE_OPENPTY (something along those lines -
> > > don't have the build area handy right now), and also includes -lutil in
> > > LIBS.  Looks like this was done unconditionally?  In any case, after
> > > tweaking those lines in the make file the pty extension at least
> > > compiled.  If this wasn't the right list for my question/follow-up,
> > > apologies in advance.
> >
> > It should be done by have_library("util", "openpty") in
> > extconf.rb.  Can't you show the mkmf.log?
>
> Sorry - I did not know about the mkmf.log until you pointed me at it.
> I build Open Source tools all of the time.  The ruby build has always
> been a bit of a mystery to me in terms of how it is architected.
> In any case, upon looking at this log file I was able to root cause
> the failure mode that was causing ruby to think it had access
> to 'util.h' and -lutil.
>
> Basically, the build assumes it is using gcc, and when built
> with HPs ansic compiler it encounters a failure mode that
> leads the build to conclude the test succeeded vs. failed.
>
> The test is:
> $CC -o conftest $CFLAGS -lutil -E conftest.c
>
> -E tells both gcc and ansic to dump the pre-processor output.
> gcc interprets -o as a directive to dump the output into conftest.
> /opt/ansic/bin/cc, when it sees -E, does not understand -o.
> it just dumps the output to stdout.   A better way to do this
> when using ansic is to use the '-P' directive, like so:
> $CC $CFLAGS -P conftest.c.  The preprocessor output will
> be put into conftest.i.
>
> I tried using gcc but ran into another failure mode, and I much
> prefer using HPs ansic compiler on HPUX because it produces
> much much tighter code than gcc does.
>
> On HPUX give me Ruby and Perl compiled with ansic over
> perl/ruby compiled with gcc any day of the week and
> twice on Sunday.
>
> -Rob

To follow up my own post, here's the problem with gcc.
When using gcc, the build sends HP Linker flags into gnu's ld.
When using cc, the build uses HPs linker and sends in HP Linker flags.

If you need examples let me know and I'll reproduce and
dump logs.   I'm not 100% savvy about how this build is
architected so if there are specific logs you want let me know.

-Rob