Re: warning from AC_LANG_PROGRAM(Fortran 77)

[Allan Clark]

John W. Eaton wrote:

> I'm using Autoconf 2.59:
>
> devzero:450> autoconf --version
> autoconf (GNU Autoconf) 2.59
> Written by David J. MacKenzie and Akim Demaille.
>
> Copyright (C) 2003 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> Given the following input file
>
> AC_INIT
> AC_PREREQ(2.50)
> AC_LANG_PUSH(Fortran 77)
> AC_TRY_LINK([],[],[])
> AC_LANG_POP(Fortran 77)
>
> Autoconf emits the following warning:
>
> devzero:449> autoconf foo.in > foo.out
> foo.in:4: warning: AC_LANG_PROGRAM(Fortran): ignoring PROLOGUE: []
> autoconf/lang.m4:224: AC_LANG_SOURCE is expanded from...
> autoconf/lang.m4:234: AC_LANG_PROGRAM is expanded from...
> autoconf/general.m4:2215: AC_LINK_IFELSE is expanded from...
> autoconf/general.m4:2223: AC_TRY_LINK is expanded from...
> foo.in:4: the top level
>
> The INCLUDES argument ($1) of AC_TRY_LINK is empty, so I don't think I
> should see a warning about ignoring that as there is nothing to
> ignore.  Is there any way to avoid this warning?
try:

...
AC_LANG_PUSH([Fortran 77])
...
AC_LANG_POP([Fortran 77])

I don't use Fortran, nor do I claim to know the right parameters, I'm just 
interested to see if it acts differently with brackets.


Allan