Re: how to use AC_CHECK_LIB without LDFLAGS?

[Braden McDaniel]

Harald Dunkel wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Braden McDaniel wrote:
> | Harald Dunkel wrote:
> |
> |> -----BEGIN PGP SIGNED MESSAGE-----
> |> Hash: SHA1
> |>
> |> Braden McDaniel wrote:
> |> |
> |> | I don't fully understand the problem you're describing; but perhaps 
> you
> |> | want to do something like this:
> |> |
> |> | save_LDFLAGS="$LDFLAGS"
> |> | LDFLAGS="$LDFLAGS -Lwhatever"
> |> | AC_CHECK_LIB(...)
> |> | LDFLAGS="$save_LDFLAGS"
> |> |
> |>
> |> No, what I want to do is something like
> |>
> |> AC_CHECK_LIB([my], [anysym], ["-static -L/mylibs -L/plibs"], [], [])
> |>
> |> but this doesn't seem to be in the interface.
> |
> |
> | It looks to me like you could accomplish the same thing with the
> | solution I gave you. What's wrong with it?
> |
>
> Sorry, but it is error-prone, and it is pretty painfull
> to copy-n-paste all these lines for each library test. I
> thought the goal of autoconf is to make maintaining a
> build system easier?
>
> No offense.

The macros included by autoconf are building blocks. The requirements of 
different projects vary so much that it's simply unrealistic to expect 
there already to exist a macro for whatever you might need. Doing 
nontrivial things with autoconf pretty much requires that you learn the 
basics of writing your own macros. That said, it's a good idea to look 
here first to see if someone's already solved the problem and made the 
solution available:

  <http://www.gnu.org/software/ac-archive/>

> My suggestion would be to put your wrapper into an
> additional macro AC_CHECK_LIB_XTD. Give me some time
> to learn m4 and I could post it here, but I guess it
> would be pretty easy.
>
> Would this be possible?

I doubt you'll find much support for adding such a macro to autoconf. 
(Your requirements aren't as common as you might think; in fact, I'm 
inclined to suspect there's a better and completely different solution 
to the problem you're trying to solve. But I don't have enough 
information about the problem parameters to make a concrete suggestion.) 
But there's nothing stopping you from writing your own.

AC_DEFUN([YOUR_CHECK_LIB],
[save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS $3"
AC_CHECK_LIB([$1], [$2], [$4], [$5])
LDFLAGS="$save_LDFLAGS"
])

Braden