configure.in: Handle OpenBSD with and without threads.

        * configure.in: Handle OpenBSD with and without threads.
        * config/openbsd.ml: New file.
        * config/openbsd.mt: New file.

From-SVN: r25291

libstdc++/ChangeLog

+Thu Feb 18 19:53:17 1999  Marc Espie <espie@cvs.openbsd.org>
+
+	* configure.in: Handle OpenBSD with and without threads.
+	* config/openbsd.ml: New file.
+	* config/openbsd.mt: New file.
+
 1999-01-28  Baron Roberts  <baron@sgi.com>
 
 	* string: Uncomment wstring declaration.

libstdc++/config/openbsd.ml

+# Base shared lib for OpenBSD i386
+
+LIBS    = $(ARLIB) $(SHLIB) $(SHLINK) mshlink
+SHFLAGS = -nostdlib -Wl,-Bshareable,-Bforcearchive
+SHDEPS  = -lm
+DEPLIBS = ../$(SHLIB)
+

libstdc++/config/openbsd.mt

+# tell we want the mt-safe version
+MT_CFLAGS = -D_IO_MTSAFE_IO -D_PTHREADS
+

libstdc++/configure.in

@@ -63,6 +63,7 @@ if [ "${shared}" = "yes" ]; then
     *-*-irix[56]*)	frags="${frags} irix5.ml" ;;
     *-*-linux*aout*)	;;
     *-*-linux*)		frags="${frags} linux.ml" ;;
+    *-*-openbsd*)		frags="${frags} openbsd.ml" ;;
     *-*-sysv[45]*|*-*-udk*)	frags="${frags} elf.ml" ;;
     *-*-solaris*)	frags="${frags} sol2shm.ml" ;;
     *-*-sunos4*)	frags="${frags} sunos4.ml" ;;
@@ -76,6 +77,10 @@ case "${target}" in
   alpha*-*-linux-gnulibc1)	frags="${frags} linux.mt" ;;
   powerpc*-*-linux-gnulibc1)	frags="${frags} linux.mt" ;;
   *-*-linux-gnu)		frags="${frags} linux.mt" ;;
+  *-*-openbsd*)		
+  	case "x${enable_threads}" in
+		xyes|xposix)	frags="${frags} openbsd.mt" ;;
+	esac;;
   m68k-motorola-sysv)		frags="${frags} delta.mt" ;;
   *-*-solaris*)
     case "x${enable_threads}" in