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Meaty Skeleton - No rule to make target
Posted: Fri May 27, 2016 4:46 am
by bilsch01
I'm adding a GAS assembler file named kb1.S in Meaty Skeleton that gets keyboard input. There is already a GAS file in the build named boot.S and the only rule for that one is:
Code: Select all
%.o: %.S
$(CC) -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
When I run Make I get the message: No rule to make target (ARCHDIR)/kb1.o.
Why isn't the existing rule sufficient for the added GAS file kb1.S ? What can I do?
A variable in an included makefile (make.config) has the object files from both GAS files:
Code: Select all
KERNEL_ARCH_OBJS:=\
$(ARCHDIR)/boot.o \
$(ARCHDIR)/tty.o \
(ARCHDIR)/kb1.o \
Re: Meaty Skeleton - No rule to make target
Posted: Fri May 27, 2016 5:59 am
by Combuster
Have you looked carefully? What's the letter-by-letter difference between the boot.o line and the kb1.o line in your make.config?
Re: Meaty Skeleton - No rule to make target
Posted: Fri May 27, 2016 12:44 pm
by bilsch01
Combuster wrote:Have you looked carefully? What's the letter-by-letter difference between the boot.o line and the kb1.o line in your make.config?
Okay. Got it. Thanks. Bill S.
Re: Meaty Skeleton - No rule to make target
Posted: Fri May 27, 2016 1:44 pm
by glauxosdever
Hi,
bilsch01 wrote:There is already a GAS file in the build named boot.S and the only rule for that one is:
Code: Select all
%.o: %.S
$(CC) -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
This seems suspiciously wrong. Are you really trying to assemble an assembly file with GCC?
Hint: $(CC) stands for C Compiler, what you want is $(AS).
Regards,
glauxosdever
Re: Meaty Skeleton - No rule to make target
Posted: Fri May 27, 2016 2:41 pm
by mikegonta
glauxosdever wrote:bilsch01 wrote:There is already a GAS file in the build named boot.S and the only rule for that one is:
Code: Select all
%.o: %.S
$(CC) -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
This seems suspiciously wrong. Are you really trying to assemble an assembly file with GCC?
Hint: $(CC) stands for C Compiler, what you want is $(AS).
GCC will be more then happy to
assemble the
.S file to an object file (
.o).
In fact it will first pass it to
cpp the C preprocessor and then pass it along to
AS.
PS. Bill has been keeping us entertained
here and
here.
Re: Meaty Skeleton - No rule to make target
Posted: Fri May 27, 2016 2:58 pm
by glauxosdever
Hi,
mikegonta wrote:GCC will be more then happy to assemble the .S file to an object file (.o).
In fact it will first pass it to cpp the C preprocessor and then pass it along to AS.
I'm not sure it is a portable solution. You can't assume every C compiler will actually assemble assembly code.
mikegonta wrote:PS. Bill has been keeping us entertained
here and
here.
I don't see the point of this statement.
Regards,
glauxosdever
Re: Meaty Skeleton - No rule to make target
Posted: Tue May 31, 2016 3:31 am
by Solar
glauxosdever wrote:I'm not sure it is a portable solution. You can't assume every C compiler will actually assemble assembly code.
Err... can you assumbe that any two
assemblers would actually assemble your source code?
Anyway,
GNU make implicit rules actually use $(CC) to turn .s into object code if you link directly (i.e. omit the -c), so it's not as if using $(CC) for assembly is something the OP came up with... but yes, on the other hand GNU make uses $(AS) for implicitly turning .s to intermediate .o, so both of you have a point.