Re: [Boost-users] BGL autoconf macros

From: Fred Labrosse (ffl_at_[hidden])
Date: 2006-04-20 03:46:32

On Wednesday 19 Apr 2006 21:37, Johan Oudinet wrote:
> On 4/19/06, Fred Labrosse <ffl_at_[hidden]> wrote:
> > All,
> >
> > Anybody knows of autoconf macros that would test for the presence of
> > graph
>
> autoconf means the tool in autotools ?

Yes, sorry.

>
> > related stuff?  I could not find any in boost itself and the ones on the
> > Web are not specific to BGL.
>
> If I understand your question, try this :
>    AC_CHECK_HEADER([boost/graph/adjacency_list.hpp], [],
>                    [AC_MSG_FAILURE([Boost headers missing.])])
>
> and repeat for each boost header used in your project.

I tried that and it came up with loads of errors because autotools now try to 
compile a program including the file and the compilation failed because, I 
think, it did it with gcc rather than g++.

I have this in configure.ac:

AC_CHECK_HEADER([boost/graph/adjacency_list.hpp],
   [],
   AC_MSG_ERROR([Boost Graph Library (BGL) is needed]))

and config.log contains:

configure:6013: checking boost/graph/adjacency_list.hpp usability
configure:6025: gcc -c -g -O2  -Wall -I/home/ffl/local/include 
-I/usr/include/libpng12 -I/usr/local/include/player-2.0   conftest.c >&5
In file included from /usr/include/boost/config.hpp:40,
                 from /usr/include/boost/graph/adjacency_list.hpp:14,
                 from conftest.c:58:
/usr/include/boost/config/select_stdlib_config.hpp:20:19: utility: No such 
file or directory
In file included from /usr/include/boost/config.hpp:53,
                 from /usr/include/boost/graph/adjacency_list.hpp:14,
                 from conftest.c:58:
/usr/include/boost/config/platform/linux.hpp:14:19: cstdlib: No such file or 
directory

and so on...

But while writing this, I just discovered:

AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_CHECK_HEADER([boost/graph/adjacency_list.hpp],
   [],
   AC_MSG_ERROR([Boost Graph Library (BGL) is needed]))
AC_LANG_RESTORE

which does it.

Thanks, and sorry for wasting time.  I just hope this will be useful to 
somebody.

Cheers,

Fred