+
+# This script UU/usethreads.cbu will get 'called-back' by Configure
+# after it has prompted the user for whether to use threads.
+cat > UU/usethreads.cbu <<'EOCBU'
+case "$usethreads" in
+$define|true|[yY]*)
+ lc_r=`/sbin/ldconfig -r|grep ':-lc_r'|awk '{print $NF}'|sed -n '$p'`
+ case "$osvers" in
+ 0*|1*|2.0*|2.1*) cat <<EOM >&4
+I did not know that FreeBSD $osvers supports POSIX threads.
+
+Feel free to tell perlbug@perl.org otherwise.
+EOM
+ exit 1
+ ;;
+
+ 2.2.[0-7]*)
+ cat <<EOM >&4
+POSIX threads are not supported well by FreeBSD $osvers.
+
+Please consider upgrading to at least FreeBSD 2.2.8,
+or preferably to the most recent -RELEASE or -STABLE
+version (see http://www.freebsd.org/releases/).
+
+(While 2.2.7 does have pthreads, it has some problems
+ with the combination of threads and pipes and therefore
+ many Perl tests will either hang or fail.)
+EOM
+ exit 1
+ ;;
+
+ [3-5].*)
+ if [ ! -r "$lc_r" ]; then
+ cat <<EOM >&4
+POSIX threads should be supported by FreeBSD $osvers --
+but your system is missing the shared libc_r.
+(/sbin/ldconfig -r doesn't find any).
+
+Consider using the latest STABLE release.
+EOM
+ exit 1
+ fi
+ # 500016 is the first osreldate in which one could
+ # just link against libc_r without disposing of libc
+ # at the same time. 500016 ... up to whatever it was
+ # on the 31st of August 2003 can still be used with -pthread,
+ # but it is not necessary.
+
+ # Anton Berezin says that post 500something we're wrong to be
+ # to be using -lc_r, and should just be using -pthread on the
+ # linker line.
+ # So presumably really we should be checking that $osver is 5.*)
+ # and that `/sbin/sysctl -n kern.osreldate` -ge 500016
+ # or -lt 500something and only in that range not doing this:
+ ldflags="-pthread $ldflags"
+
+ # Both in 4.x and 5.x gethostbyaddr_r exists but
+ # it is "Temporary function, not threadsafe"...
+ # Presumably earlier it didn't even exist.
+ d_gethostbyaddr_r="undef"
+ d_gethostbyaddr_r_proto="0"
+ ;;
+
+ *)
+ # 7.x doesn't install libc_r by default, and Configure
+ # would fail in the code following
+ #
+ # gethostbyaddr_r() appears to have been implemented in 6.x+
+ ldflags="-pthread $ldflags"
+ ;;
+
+ esac
+
+ case "$osvers" in
+ [1-4]*)
+ set `echo X "$libswanted "| sed -e 's/ c / c_r /'`
+ shift
+ libswanted="$*"
+ ;;
+ *)
+ set `echo X "$libswanted "| sed -e 's/ c //'`
+ shift
+ libswanted="$*"
+ ;;
+ esac
+
+ # Configure will probably pick the wrong libc to use for nm scan.
+ # The safest quick-fix is just to not use nm at all...
+ usenm=false
+
+ case "$osvers" in
+ 2.2.8*)
+ # ... but this does not apply for 2.2.8 - we know it's safe
+ libc="$lc_r"
+ usenm=true
+ ;;
+ esac
+
+ unset lc_r
+
+ # Even with the malloc mutexes the Perl malloc does not
+ # seem to be threadsafe in FreeBSD?
+ case "$usemymalloc" in
+ '') usemymalloc=n ;;
+ esac
+esac
+EOCBU
+
+# malloc wrap works
+case "$usemallocwrap" in
+'') usemallocwrap='define' ;;
+esac
+
+# XXX Under FreeBSD 6.0 (and probably most other similar versions)
+# Perl_die(NULL) generates a warning:
+# pp_sys.c:491: warning: null format string
+# Configure supposedely tests for this, but apparently the test doesn't
+# work. Volunteers with FreeBSD are needed to improving the Configure test.
+# Meanwhile, the following workaround should be safe on all versions
+# of FreeBSD.
+d_printf_format_null='undef'