From: nesius <nesius@...>
Date: 2004-09-01T05:55:10+09:00
Subject: Re: Followup on HPUX build issue



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