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Avoiding to write test programs

From: Magnus Fromreide
Subject: Avoiding to write test programs
Date: Tue, 22 May 2012 08:04:58 +0200

Sometimes I wish to perform multiple runs of AC_*_IFELSE using the same
source but different compiler options.

When doing that I have noticed that it seems as if only the first call
to AC_*_IFELSE needs the INPUT argument but on the other hand this seems
to be completely undocumented.

Is this a feature or a bug?


# Check for pthreads
    address@hidden:@include <pthread.h>]],
    [[pthread_create(0, 0, 0, 0);]])], [],
   CFLAGS="$CFLAGS -pthread"
   AC_LINK_IFELSE([], [],
      LIBS="-lpthread $LIBS"
      AC_LINK_IFELSE([], [],
        [AC_MSG_ERROR([pthreads are required but was not found])])])])

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