RE: AC_OBJEXT again

[Bernard Dautrevaux]

> -----Original Message-----
> From: Earnie Boyd [mailto:address@hidden
> Sent: Thursday, November 30, 2000 5:22 PM
> To: Akim Demaille
> Cc: Lars J. Aas; address@hidden; APatche
> Subject: Re: AC_OBJEXT again
> 
> 
> --- Akim Demaille <address@hidden> wrote:
> > >>>>> "Earnie" == Earnie Boyd <address@hidden> writes:
> > 
> > Earnie> HTH,
> > 
> > It does, thanks.  But then, you are referring to EXEEXT as a *build*
> > feature, not a host feature.
> > 
> > Frankly, I think we will never end having problems until we 
> introduce
> > the two sets.  I can't see why EXEEXT and OBJEXT should be both
> > relevant for the build process, and for when the program is 
> run on its
> > host.
> 
> AISI, OBJEXT is only a build feature while EXEEXT is both a 
> build feature and a
> host feature.
> 

Even more precisely:

OBJEXT is a feature of the host-compiler running on the build-system
EXEEXT is a host-system feature

The whole problem with the AC_EXEEXT macro is that when build==host==cygwin,
the compiler GENERATES a conftest.exe file, but "ls conftest" or "test -f
conftest" will find "conftest.exe" (and ls will report "conftest.exe"'s name
as "conftest") but, as Earnie said, "rm conftest" will FAIL...

Perhaps in fact we can write the test as:
 
      for ac_file in `ls conftest conftest.exe conftest.* 2>/dev/null`; do
        case $ac_file in
          *.$ac_ext | *.o | *.obj | *.xcoff | *.tds) ;;
          conftest)
           if rm conftest; then
             ac_cv_exeext=
             break
           fi
           ;;
          *) ac_cv_exeext=`expr "$ac_file" : 'conftest\(.*\)'`
             break;;
        esac
      done

Sure it looks UGLY, and we should document why ls could return conftest and
rm not be able to remove it, but it should work around cygwin magic :-)

Regards,

        Bernard

--------------------------------------------
Bernard Dautrevaux
Microprocess Ingenierie
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92400 COURBEVOIE
FRANCE
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e-mail: address@hidden
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