(autocf21.info.gz) Multiple Cases
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5.7 Multiple Cases
==================
Some operations are accomplished in several possible ways, depending on
the UNIX variant. Checking for them essentially requires a "case
statement". Autoconf does not directly provide one; however, it is
easy to simulate by using a shell variable to keep track of whether a
way to perform the operation has been found yet.
Here is an example that uses the shell variable `fstype' to keep
track of whether the remaining cases need to be checked.
AC_MSG_CHECKING(how to get filesystem type)
fstype=no
# The order of these tests is important.
AC_TRY_CPP([#include <sys/statvfs.h>
#include <sys/fstyp.h>], AC_DEFINE(FSTYPE_STATVFS) fstype=SVR4)
if test $fstype = no; then
AC_TRY_CPP([#include <sys/statfs.h>
#include <sys/fstyp.h>], AC_DEFINE(FSTYPE_USG_STATFS) fstype=SVR3)
fi
if test $fstype = no; then
AC_TRY_CPP([#include <sys/statfs.h>
#include <sys/vmount.h>], AC_DEFINE(FSTYPE_AIX_STATFS) fstype=AIX)
fi
# (more cases omitted here)
AC_MSG_RESULT($fstype)
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