OSDev.org

Posted: **Wed Nov 12, 2014 4:07 pm**

Hello World!
I hate to begin my account on this forum asking for help, but here goes anyway.

I've been following along the beginners tutorials. First came the barebones which I compiled and modified without a hitch. Now I'm on the Meaty Skeleton tutorial and I'm having some trouble with building the provided tutorial. Unless I'm mistaken, the code provided in the tutorial should be enough to compile and display a short message on the screen. I'm running into some trouble with regards to building libc.a. When I run build.sh I eventually run into the following error:

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blah blah compiling...
make: *** No rule to make target '\', needed by 'libc.a'.  Stop.
make: Leaving directory '/home/daniel/documents/Programming/OSDev/dosdos/libc'

A full dump is available here: http://pastebin.com/vVMzDWDq

At first, I thought the issue was an accidental typo on my part in libc's Makefile, but I've checked and rechecked and copy-pasted from the wiki.

Then I thought that maybe a file was in the wrong place. At the bottom of this post is a layout of my project's directories and files. As far as I can tell, they are identically laid out to those in the tutorial (With the exception of the GPL Licensing folder I've added).

If it makes any difference, I'm running 64 bit Arch Linux with GNU Make version 4.1

Could anyone help me with this?

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.
├── build.sh
├── clean.sh
├── config.sh
├── default-host.sh
├── headers.sh
├── iso.sh
├── kernel
│   ├── arch
│   │   └── i386
│   │       ├── boot.S
│   │       ├── crti.S
│   │       ├── ctrn.S
│   │       ├── linker.ld
│   │       ├── make.config
│   │       └── tty.c
│   ├── include
│   │   └── kernel
│   │       ├── tty.h
│   │       └── vga.h
│   ├── kernel
│   │   └── kernel.c
│   └── Makefile
├── libc
│   ├── arch
│   │   └── i386
│   │       └── make.config
│   ├── include
│   │   ├── stdio.h
│   │   ├── stdlib.h
│   │   ├── string.h
│   │   └── sys
│   │       └── cdefs.h
│   ├── Makefile
│   ├── stdio
│   │   ├── printf.c
│   │   ├── putchar.c
│   │   └── puts.c
│   ├── stdlib
│   │   └── abort.c
│   └── string
│       ├── memcmp.c
│       ├── memcpy.c
│       ├── memmove.c
│       ├── memset.c
│       └── strlen.c
├── license
│   ├── COPYING.txt
│   └── GPL Header.txt
├── qemu.sh
└── target-triplet-to-arch.sh

15 Directories, 35 Files

Posted: **Wed Nov 12, 2014 6:11 pm**

You have a backslash ("\") in the error message, which is uncharacteristic for a Linux separator.

Posted: **Wed Nov 12, 2014 7:00 pm**

I did notice that. It's what prompted me to check the file stricture as well as the makefiles.

Here is my libc makefile http://pastebin.com/k6dnQKHL. I've taken it directly from the tutorial. I have absolutely no clue what could be causing it.

Thanks to eryjus I removed the two \'s in libc's make.config which allowed me to compile libc.

UPDATE

Now I'm faced with a somewhat similar issue with the kernel's makefile. I get the error:

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make: *** No rule to make target 'arch/i386/crtn.o', needed by 'myos.kernel'.  Stop.

Of course, looking at the kernel's make.config doesn't suggest that the same solution would work.

make.config

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KERNEL_ARCH_CFLAGS:=
KERNEL_ARCH_CPPFLAGS:=
KERNEL_ARCH_LDFLAGS:=
KERNEL_ARCH_LIBS:=
 
KERNEL_ARCH_OBJS:= \
$(ARCHDIR)/boot.o \
$(ARCHDIR)/tty.o \

Pertinent excerpt from the kernel's makefile:

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OBJS:= \
$(KERNEL_ARCH_OBJS) \
kernel/kernel.o \

CRTI_OBJ:=$(ARCHDIR)/crti.o 
CRTBEGIN_OBJ:=$(shell $(CC) $(CFLAGS) $(LDFLAGS) -print-file-name=crtbegin.o) 
CRTEND_OBJ:=$(shell $(CC) $(CFLAGS) $(LDFLAGS) -print-file-name=crtend.o) 
CRTN_OBJ:=$(ARCHDIR)/crtn.o 

ALL_OUR_OBJS:= \
$(CRTI_OBJ) \
$(OBJS) \
$(CRTN_OBJ) \

OBJ_LINK_LIST:= \
$(CRTI_OBJ) \
$(CRTBEGIN_OBJ) \
$(OBJS) \
$(CRTEND_OBJ) \
$(CRTN_OBJ) \

all: myos.kernel

.PHONY: all clean install install-headers install-kernel

myos.kernel: $(OBJ_LINK_LIST) $(ARCHDIR)/linker.ld
	$(CC) -T $(ARCHDIR)/linker.ld -o $@ $(CFLAGS) $(OBJ_LINK_LIST) $(LDFLAGS) $(LIBS)

Posted: **Wed Nov 12, 2014 8:41 pm**

You have whitespace issues.The wiki markup can be silly. Use the view source feature to get the real version. The backslash characters must be the last on their lines.

Posted: **Thu Nov 13, 2014 9:57 am**

The whitespace errors have been fixed, but now I'm getting:

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i686-elf-gcc: error:  kernel/kernel.o: No such file or directory
Makefile:55: recipe for target 'myos.kernel' failed
make: *** [myos.kernel] Error 1

It's strange, because the file is there in the proper directory and make does indeed build kernel/kernel.o out of kernel/kernel.c. If it weren't, I'd be getting an error saying: "there is no rule for 'PATH_TO_NONEXISTENT_FILE' ", right? I've tried looking up the error both online and in the GNU Make manual, but I can't really find any explanation as to what it means. Does it mean that make can't find where it's supposed to put kernel.o?

Posted: **Thu Nov 13, 2014 11:06 am**

Did you put the kernel.c file at kernel/kernel.c or kernel/kernel/kernel.c? What is the current directory? Attach a copy of tree(1)'s output again also.

Compare also with https://gitorious.org/sortie/myos/, a little example OS on which I based meaty skeleton.

Posted: **Thu Nov 13, 2014 12:19 pm**

Thanks for the link to your code. After looking over your initial commits, I found that there were indeed minute whitespace errors in a few different files.

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