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Checking libraries in multiple places -- frusturated by the cache

From: Robert A. Knop Jr.
Subject: Checking libraries in multiple places -- frusturated by the cache
Date: Sun, 25 Feb 2001 11:09:09 -0800 (PST)

I'm fairly new to autoconf, so this may be a clueless question.

What I'm trying to do is check a few standard places for a library
and then set a variable (*not* LIBS, but my own) based on where this
library was found.  To this end, I have the following code in

  for i in '' -L$prefix/lib -L$prefix/pgsql/lib; do
    AC_MSG_RESULT("Looking for Postgres library in $i")
    AC_CHECK_LIB(pq, PQconnectdb, found=1, found='', $i)
    if test $found; then
  if test $found; then
    AC_MSG_RESULT("Postgres library found: $pgsql_lib")
    AC_MSG_ERROR("Postgres library not found!")

The problem I'm having is that after the first test fails, the generated
configure script never really tests the other places I'm looking for the
library-- because the failure of the first test is cached, so it thinks it
doesn't need to do the test again!

Is there some way I can tell configure to throw out the previous cached
value of this test before tryiing the AC_CHECK_LIB test again?  I haven't
found anything in the documentation which would indicate how one does

I don't want to include the result of the test in LIBS, I want to set a
different value; this is why I don't just use AC_SEARCH_LIBS.  (In any
event, AC_SEARCH_LIBS says it sets -lsomething, not -Lsomething.)

Thanks for any help anyone can provide,


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