configure.in: Check whether it is necessary to link against libm to use ldexp.

	* configure.in: Check whether it is necessary to link against
	libm to use ldexp.
	* configure: Regenerate.
	* Makefile.in: Add LDEXP_LIB substitution variable.
	* java/Make-lang.in: Link jcf-dump against $(LDEXP_LIB).

From-SVN: r64749

gcc/Makefile.in

@@ -695,6 +695,9 @@ LIBS =	$(INTLLIBS) @LIBS@ $(LIBIBERTY)
 # Any system libraries needed just for GNAT.
 SYSLIBS = @GNAT_LIBEXC@
 
+# Libs needed (at present) just for jcf-dump.
+LDEXP_LIB = @LDEXP_LIB@
+
 # Likewise, for use in the tools that must run on this machine
 # even if we are cross-building GCC.
 BUILD_LIBS = $(BUILD_LIBIBERTY)

gcc/configure.in

@@ -752,6 +752,15 @@ GNAT_LIBEXC="$LIBS"
 LIBS="$save_LIBS"
 AC_SUBST(GNAT_LIBEXC)
 
+# Some systems put ldexp and frexp in libm instead of libc; assume
+# they're both in the same place.  jcf-dump needs them.
+save_LIBS="$LIBS"
+LIBS=
+AC_SEARCH_LIBS(ldexp, m)
+LDEXP_LIB="$LIBS"
+LIBS="$save_LIBS"
+AC_SUBST(LDEXP_LIB)
+
 # See if the stage1 system preprocessor understands the ANSI C
 # preprocessor stringification operator.  (Used by symcat.h.)
 AC_C_STRINGIZE

gcc/java/Make-lang.in

@@ -142,7 +142,8 @@ jv-scan$(exeext): $(JVSCAN_OBJS) $(LIBDEPS)
 
 jcf-dump$(exeext): $(JCFDUMP_OBJS) $(LIBDEPS)
 	rm -f $@
-	$(CC) $(ALL_CFLAGS) $(LDFLAGS) -o $@ $(JCFDUMP_OBJS) $(ZLIB) $(LIBS)
+	$(CC) $(ALL_CFLAGS) $(LDFLAGS) -o $@ $(JCFDUMP_OBJS) \
+		$(ZLIB) $(LDEXP_LIB) $(LIBS)
 
 jvgenmain$(exeext): $(JVGENMAIN_OBJS) $(LIBDEPS)
 	rm -f $@