Possible build problem

Hi all,

I discovered a problem in the current release candidate with the build system 
for Linux.

Steps to reproduce:
We want to build a robot with the name foo with exactly one source file: 
foo.cpp.
Make a directory src/drivers/foo and src/drivers/foo/compile. Put foo.cpp in 
src/drivers/foo and the Makefile which should compile it in 
src/drivers/foo/compile. The SOURCES variable in that Makefile is 
thus ../foo.cpp. Go to src/drivers/foo/compile and try to compile it. You see 
the robot is compiled correctly.

Expected result:
The robot also is linked correctly

Actual result:
A linking error occures: can't find file ../foo.o

Problem:
foo.cpp is compiled, but the object is in src/drivers/foo/compile/foo.o, and 
during linking it expects it to be in src/drivers/foo/foo.o.

Possible solution:
Make sure gcc puts the object in the right place by adding a -o $@ option to 
gcc. A patch doing this is attached.

Actual occurence:
Although this problem looks very theoretical, it can occur if the robot 
developer would use the same code for more then one robot. It then uses 
src/drivers/foo to place the code and src/drivers/foo/foo_trb1 and 
src/drivers/foo/foo_trb2 to produce the robots. This way, it is not 
neccesairy to compile everything twice: only linking have to be done twice.

Regards,

Mart

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Index: Make-default.mk
===================================================================
RCS file: /cvsroot/torcs/torcs/torcs/Make-default.mk,v
retrieving revision 1.33
diff -u -r1.33 Make-default.mk
--- Make-default.mk	7 Sep 2003 08:13:56 -0000	1.33
+++ Make-default.mk	16 Dec 2008 10:00:18 -0000
@@ -237,12 +237,12 @@
 .SUFFIXES: .cpp
 
 .cpp.o:
-	${CXX} $(INCFLAGS) $(CXXFLAGS) $(COMPILFLAGS) -c $<
+	${CXX} $(INCFLAGS) $(CXXFLAGS) $(COMPILFLAGS) -c $< -o $@
 
 .SUFFIXES: .c
 
 .c.o:
-	${CXX} $(INCFLAGS) $(CXXFLAGS) $(COMPILFLAGS) -c $<
+	${CXX} $(INCFLAGS) $(CXXFLAGS) $(COMPILFLAGS) -c $< -o $@
 
 
 #	${CC} $(INCFLAGS) $(CFLAGS) $(COMPILFLAGS) -c $<