Add a file content to a compiled binary to read at runtime.

add_file_content.log

$ cat myasmfile.S
.global MyAwesomeBinary, MyAwesomeBinaryEnd

.data
.align 8
MyAwesomeBinary:
    .incbin "file.txt"
MyAwesomeBinaryEnd:
    .zero 1
    
$ cat file.txt
Hello, world!
// myprogram.c
#include <stdio.h>

extern char MyAwesomeBinary, MyAwesomeBinaryEnd;

int main() {
    puts(&MyAwesomeBinary);
    printf("Binary length: %i\n", &MyAwesomeBinaryEnd - &MyAwesomeBinary);
}

$ gcc myprogram.c myasmfile.S -o myprogram

$ ./myprogram
Hello, world!
Binary length: 13