[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: How to use cache variables
From: |
Lars Hecking |
Subject: |
Re: How to use cache variables |
Date: |
Tue, 5 Feb 2002 17:26:10 +0000 |
User-agent: |
Mutt/1.5.0i |
John D. Burger writes:
> I have what I think is a style question:
>
> If I want to do something with the results of autoconf tests in my
> configure script, what's the best way to check these results? For
> instance, say I'd like to do this:
>
> AC_CHECK_LIB(norman, snStackPush)
> AC_CHECK_HEADERS([norman.h])
>
> # Gripe if neither the library nor the header is around
>
> if test $SOME_VAR = no && test $SOME_OTHER_VAR = no; then
> AC_MSG_WARN([$PACKAGE requires libnorman])
> fi
>
> My question is, are SOME_VAR and SOME_OTHER_VAR things I should set
> myself in the optional arguments to the AC_CHECK macros, or should I use
> cache variables? I'm uneasy about using the latter, because I've had
> trouble predicting the names of some macros' cache vars, and having to
> slog through the generated configure
> script makes me think I'm doing something wrong.
The names are fairly obvious, and there's a section in the autoconf manual
that explains them (Results of Tests->Caching Results->Cache Variable Names).
But you don't need to do it this way.
If you check the documentation for AC_CHECK_LIB() and AC_CHECK_HEADERS(),
you'll find that they can be used to execute stuff if your particular
header/lib is not found. E.g.
AC_CHECK_LIB(norman, snStackPush,
AC_CHECK_HEADERS(norman.h,,AC_MSG_WARN(norman.h not found)),
AC_MSG_WARN(snStackPush not found in libnorman)
)
You can do more in the ACTION-IF-FOUND/ACTION-IF-NOT-FOUND parts,
but then you should enclose these parts in [], resp.
- How to use cache variables, John D. Burger, 2002/02/05
- Re: How to use cache variables,
Lars Hecking <=
- Re: How to use cache variables, Thomas Dickey, 2002/02/05
- Re: How to use cache variables, Akim Demaille, 2002/02/06
- Re: How to use cache variables, John D. Burger, 2002/02/06
- Re: How to use cache variables, Akim Demaille, 2002/02/07
- Re: How to use cache variables, Thomas E. Dickey, 2002/02/07
- Re: How to use cache variables, Akim Demaille, 2002/02/07
- Re: How to use cache variables, Thomas Dickey, 2002/02/07
- Re: How to use cache variables, akim, 2002/02/07