Add rules for incremental relinking on Unix to partially fix bug 23724.

The static libraries on Win32 are still broken. r=mccabe

js/src/Makefile.ref

@@ -18,6 +18,8 @@
 # Rights Reserved.
 #
 # Contributor(s): 
+#	Michael Ang <mang@subcarrier.org>
+#	
 #
 # Alternatively, the contents of this file may be used under the
 # terms of the GNU Public License (the "GPL"), in which case the
@@ -213,6 +215,22 @@ JS_CFILES =		\
 	$(NULL)
 
 PREDIRS   += fdlibm
+ifdef USE_MSVC
+FDLIBM_LIBRARY = fdlibm/$(OBJDIR)/fdlibm.lib
+else
+FDLIBM_LIBRARY = fdlibm/$(OBJDIR)/libfdm.a
+endif
+JSMATH_PRELINK	= $(OBJDIR)/jsmathtemp.o
+# Flag for incremental linking
+DASH_R		= -r
+
+ifeq ($(OS_ARCH),QNX)
+ifneq ($(OS_TARGET),NTO)
+# Don't use wildcard here, because we only want this resolved at link time.
+OBJS		+= fdlibm/*.o
+endif
+endif
+
 ifdef JS_LIVECONNECT
 DIRS      += liveconnect
 endif
@@ -240,12 +258,6 @@ SHARED_LIBRARY = $(OBJDIR)/libjs.$(SO_SUFFIX)
 PROGRAM = $(OBJDIR)/js
 endif
 
-ifdef USE_MSVC
-FDLIBM_LIBRARY = fdlibm.lib
-else
-FDLIBM_LIBRARY = libfdm.a
-endif
-
 include rules.mk
 
 MOZ_DEPTH = ../..
@@ -254,10 +266,10 @@ include jsconfig.mk
 nsinstall-target:
 	cd ../../config; $(MAKE) OBJDIR=$(OBJDIR) OBJDIR_NAME=$(OBJDIR)
 ifdef USE_MSVC
-$(PROGRAM): $(PROG_OBJS) $(LIBRARY) fdlibm/$(OBJDIR)/$(FDLIBM_LIBRARY)
+$(PROGRAM): $(PROG_OBJS) $(LIBRARY) $(FDLIBM_LIBRARY)
 	link.exe -out:"$@" $(EXE_LINK_FLAGS) $^
 else
-$(PROGRAM): $(PROG_OBJS) $(LIBRARY) fdlibm/$(OBJDIR)/$(FDLIBM_LIBRARY)
+$(PROGRAM): $(PROG_OBJS) $(LIBRARY) $(FDLIBM_LIBRARY)
 	$(CC) -o $@ $(CFLAGS) $(PROG_OBJS) $(LIBRARY) $(LDFLAGS) $(OTHER_LIBS) \
 	    $(PROG_LIBS)
 endif
@@ -284,6 +296,31 @@ INCLUDES   += -I$(OBJDIR)
 TARGETS += $(OBJDIR)/jsautocfg.h $(OBJDIR)/jscpucfg $(OBJDIR)/jscpucfg.o
 endif
 
+
+# special rule for jsmath.o since we want to incrementally link
+# against fdlibm to pull in only what is needed
+$(OBJDIR)/jsmath.o: $(FDLIBM_LIBRARY) $(JSMATH_PRELINK)
+ifeq ($(OS_ARCH),QNX)
+ifneq ($(OS_TARGET),NTO)
+	@cp $(JSMATH_PRELINK) $@
+else	
+	$(LD) $(DASH_R) -o $@ $(JSMATH_PRELINK) $(FDLIBM_LIBRARY)
+endif
+else
+ifdef USE_MSVC
+	@echo Warning: to use $(LIBRARY) must also link against $(FDLIBM_LIBRARY)
+	@cp $(JSMATH_PRELINK) $@
+endif
+	$(LD) $(DASH_R) -o $@ $(JSMATH_PRELINK) $(FDLIBM_LIBRARY)
+endif
+
+$(JSMATH_PRELINK): jsmath.c
+ifneq (,$(filter OS2 WINNT,$(OS_ARCH)))
+	$(CC) -Fo$@ -c $(CFLAGS) $<
+else
+	$(CC) -o $@ -c $(CFLAGS) $<
+endif
+
 #
 # Hardwire dependencies on jsopcode.tbl
 #