Strange linker errors

[AUsername]

So recently I had to switch computers and setup my GCC again so I could compile the terminal for my OS. Well compiling used to work but now it's a mess.

I get the following errors:

C:\Users\Owner\DOCUME~1\MYDROP~1\Firefly\programs\HELLOW~1>compile
Compiling...
Linking...
..\entry.o(.text+0x1): undefined reference to `main'
compile\main.o(.text+0x21):main.c: undefined reference to `__alloca'
compile\main.o(.text+0x26):main.c: undefined reference to `___main'
Copying...
The system cannot find the file specified.

C:\Users\Owner\DOCUME~1\MYDROP~1\Firefly\programs\HELLOW~1>

What's strange is if I change "main" to "_main" this turns into:

C:\Users\Owner\DOCUME~1\MYDROP~1\Firefly\programs\HELLOW~1>compile
Compiling...
Linking...
..\entry.o(.text+0x1): undefined reference to `main'
Copying...
The system cannot find the file specified.

C:\Users\Owner\DOCUME~1\MYDROP~1\Firefly\programs\HELLOW~1>

So somehow __alloca and ___main (triple underscore?) both disappear. But a reference to main is still missing?
Plus in the original it should be able to call main.

compile.bat:

@echo off
@echo Compiling...
gcc -o compile\main.o -c main.c -I..\include\ -Wextra -fno-builtin -nostdlib -nostartfiles -nodefaultlibs -fno-leading-underscores
@echo Linking...
ld-elf -L..\libraries\ -T compile\linker.ld -o hello.prg ..\entry.o compile\main.o -lstdio -lstdlib -l_sysapi -lstring

@echo Copying...
copy hello.prg A:\programs\hello.prg

entry.s:

Code: Select all

global entrypoint
extern main

section .text
align 4

entrypoint:
	jmp		main

section .bss
align 4

I honestly have no idea what's wrong.

[Combuster]

GCC Cross-Compiler

[AUsername]

GCC Cross-Compiler

Somehow, I knew I was going to get this reply.
Now, perhaps some people may not have attempted to set up GCC properly, however I have on at least 4 different machines, running 4 different OSs. Both Windows and Linux.

The problem was in not how I set GCC up because I'm using ld-elf, which would have fixed that. The problem was with the copy of GCC I had.

For some reason it ignored -fno-leading-underscores, so it compiled the objects with leading underscores, resulting in those errors.

I switched what flavor of GCC I was using and now it works.

But please stop posting "Setting up GCC" as your first response, it gets really annoying to see that as the first thing that comes out of your mouth, assuming that people haven't tried, or that is the problem.

By the way, it works now so don't worry about it.

[Grunt]

Actually, his advice was correct.

I know I had similar problems when trying MinGW and Cygwin. A cross-compiler helps not only for this kind of problems, but it is also a starting point to porting a C library, and eventually build a whole toolchain.

[Combuster]

You are contradicting yourself by saying that you don't know the solution, and yet you claim you knew in advance that you'll get the crosscompiler link as reply (and thus either did not read or bother to try, i.e. broke forum rules, or already knew the answer)

I could have told you to STFWiki instead, would that help you?

[Wolf9466]

You are contradicting yourself by saying that you don't know the solution, and yet you claim you knew in advance that you'll get the crosscompiler link as reply (and thus either did not read or bother to try, i.e. broke forum rules, or already knew the answer)

I could have told you to STFWiki instead, would that help you?

Hello? He obviously didn't know the solution, and you seemingly ALWAYS post a link to the wiki, like people haven't already read it. Which means that he didn't know the answer, but anticipated you being a prick.

[quok]

By the way, it works now so don't worry about it.

Great, glad to know that you got your problem fixed. Perhaps you could tell us more about what you ended up doing to fix the problem though, so it could be added to the wiki?
Thanks in advance!

[AUsername]

By the way, it works now so don't worry about it.

Great, glad to know that you got your problem fixed. Perhaps you could tell us more about what you ended up doing to fix the problem though, so it could be added to the wiki?
Thanks in advance!

The version of GCC I was using didn't support "-fno-leading-underscores" for some reason and didn't report that it didn't.
I switched what version I was using and it worked!
(not sure what the previous version was)