Re: CC can be a program name *with arguments*

[Gary V. Vaughan]

Hallo Ralf!

Ralf Wildenhues wrote:
>>>You guys ever encountered a system with compilers named
>>>  gcc-3.4.1
>>>  gcc-3.4.2
>>>  icc-8.1
>>>  ...
>>
>>Yep, but you would need to build a different libtool for each compiler.
>>Relying on the compiler checks performed on one working for another is
>>likely to cause trouble.
> 
> 
> Sure.  But we are talking about m4/libtool.m4, right?
> This happens at configure time.
> 
> I want, in a libtoolized project,
>   ../configure CC='pgcc-78.9 -foo-option'
> to succeed in choosing Portland compiler options.  No multiple compilers
> involved here.

Ah yes.  Thinko.  Currently we should recommend:

  ../configure CC='/opt/pgcc-78.9/bin/pgcc -foo-option'

But, I agree that supporting multiple compilers in users' PATH is also
a nice feature.  Like you said, "let's do both!" :-)  We'll need an
entry in sh.test to spot switches missing the '*' inside 'case $cc_basename'
to save us forgetting in the future as part of the patch too.

> Well, yes.  Maybe it could be worth doing s#-.*## to kill version
> appendices.  But that would be more limiting than necessary IMVHO
> (nobody specified version appendices had to look like this).

Agreed.

>>  cc_basename=`$echo X"$compiler" | $Xsed -e 's%^[    ]*\([^  ]*\).*$%\1%'`
> 
> 
> Why?  People writing
>   CC=' gcc'
> by accident are people that get run over by accident.  :->

Be liberal in what input you accept... besides, plenty of our concatenation
loops leave a leading space, so it won't hurt to get into the habit of
taking leading whitespace into account.

I forgot the path stripping too, gah!  Let me try again:

  cc_basename=`$echo X"$compiler" \
          | $Xsed -e 's%.*/%%;s%^[      ]*\([^  ]*\).*$%\1%'`


Cheers,
        Gary.
-- 
Gary V. Vaughan      ())_.  address@hidden,gnu.org}
Research Scientist   ( '/   http://tkd.kicks-ass.net
GNU Hacker           / )=   http://www.gnu.org/software/libtool
Technical Author   `(_~)_   http://sources.redhat.com/autobook

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