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