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Re: Finding library procedures in /usr/local/lib/
From: |
Ralf Wildenhues |
Subject: |
Re: Finding library procedures in /usr/local/lib/ |
Date: |
Fri, 3 Apr 2009 20:29:36 +0200 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
Hello Gerald,
* Gerald I. Evenden wrote on Fri, Apr 03, 2009 at 08:11:22PM CEST:
> One added note, that bothers me a little.
>
> If the system checks for an entry being present in a particular iibrary by
> compiling/linking a test program using the function *and* linking to the
> specified library,----> what if the library under test heavily references
> another library such as -lm?? IF -lm is not in the test run would the test
> not fail??????? Thus the entry under test fails also.
I haven't read the thread in full, but this is probably the issue
bothering you:
AC_CHECK_LIB and AC_SEARCH_LIBS both have an optional 5th argument where
one can supply additional needed libraries. So of libfoo needs libm,
then a check for libfoo could look like
AC_SEARCH_LIBS([function_from_libfoo], [foo], [], [], [-lm])
and after this macro, $LIBS would contain -lfoo if the test was
successful. Of course, you can check for both in sequence,
AC_SEARCH_LIBS([cos], [m])
AC_SEARCH_LIBS([function_from_libfoo], [foo])
and in this case you don't need to specify -lm in the second macro,
because the first macro will have added that to $LIBS (and $LIBS is used
for linking).
And yes, library linking order *always* matters. The bugs are just more
obscure with GNU/Linux and shared linking than they are under other
circumstances.
Cheers,
Ralf
- Troubles with proc*C and automake version 1.10, acprdoer, 2009/04/01
- Re: Troubles with proc*C and automake version 1.10, Ralf Wildenhues, 2009/04/01
- Re: Troubles with proc*C and automake version 1.10, acprdoer, 2009/04/02
- Finding library procedures in /usr/local/lib/, Gerald I. Evenden, 2009/04/02
- Re: Finding library procedures in /usr/local/lib/, Peter Johansson, 2009/04/02
- Re: Finding library procedures in /usr/local/lib/, Gerald I. Evenden, 2009/04/03
- Re: Finding library procedures in /usr/local/lib/, John Calcote, 2009/04/03
- Re: Finding library procedures in /usr/local/lib/, Gerald I. Evenden, 2009/04/03
- Re: Finding library procedures in /usr/local/lib/, Gerald I. Evenden, 2009/04/03
- Re: Finding library procedures in /usr/local/lib/,
Ralf Wildenhues <=
- Re: Finding library procedures in /usr/local/lib/, John Calcote, 2009/04/03
- Re: Finding library procedures in /usr/local/lib/, Peter Johansson, 2009/04/03
- Re: Finding library procedures in /usr/local/lib/, Gerald I. Evenden, 2009/04/03
Re: Finding library procedures in /usr/local/lib/, John Calcote, 2009/04/02
Re: Finding library procedures in /usr/local/lib/, John Calcote, 2009/04/02
Re: Finding library procedures in /usr/local/lib/, Jan Engelhardt, 2009/04/03