4 replies to this topic

[DarkLordofthePenguins]

I've only been able to assemble a program into an object file. What is the option to convert an object file into an executable?

This is the command I use:

nasm -f elf file.s

This creates an object file called file.o. I already tried using the -o option. It still creates an object file, but with a different filename.

I tried converting the object file to an executable like this:

nasm -f elf file.o -o prog

It produces this error message:

first.o:1: error: label or instruction expected at start of line

This is the error message when I try to run the object file:

bash: ./first: cannot execute binary file

I hope this is enough information.

[dargueta]

nasm -felf -o mycode.o mycode.asm
gcc -o myexe mycode.o

That's the most basic form. If you have to link to any other libraries you have to specify them yourself.

[RhetoricalRuvim]

Isn't there also an LD syntax?

[DarkLordofthePenguins]

The code I was trying to assemble uses external C libraries. That's why I got an error when I tried linking the object file with gcc. Unfortunately, I don't know the names of the libraries storing the C Standard Library code, or the path to glibc, if all the Standard Library functions are defined there.

[mebob]

Using GCC automatically links the standard C libraries into the program. It should, at least. It has always worked for me.