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/*
@TODO:
- compile as well as link
- disable "warning: relocation XXX not in a data/text section" for .rel.eh_frame
- these warnings are being generated in two places. do they need to be?
- make executables more tiny (overlap sections, etc.)
- generate a warning/error on position-independent object files
- static libraries
*/
extern crate clap;
use std::env;
use clap::Parser;
#[cfg(target_endian = "big")]
compile_error! {"WHY do you have a big endian machine???? it's the 21st century, buddy. this program won't work fuck you"}
mod elf;
pub mod linker;
#[derive(Parser, Debug)]
struct Args {
/// Input files: object files (.o) and shared libraries (.so) are supported.
inputs: Vec<String>,
/// If set, the program will not be linked against libc.
///
/// This makes the executable smaller.
#[arg(long = "no-stdlib", default_value_t = false)]
no_std_lib: bool,
/// If set, the program will be linked against libstdc++.
///
/// This is needed when using the standard template library.
#[arg(long = "stdc++", default_value_t = false)]
std_cpp: bool,
/// Output executable path.
#[arg(short = 'o', long = "output", default_value = "a.out")]
output: String,
/// The name of the function which will be used as the entry point.
#[arg(short = 'e', long = "entry", default_value = "entry")]
entry: String,
/// :3
#[arg(long = "nya")]
nya: bool,
/// C compiler
///
/// First this is checked, then the `CC` environment variable,
/// then if both aren't set, (/usr/bin/)cc is used.
#[arg(long = "cc", default_value = "auto")]
cc: String,
/// C compiler flags
///
/// The C compiler is invoked using `(cc) (cflags) (C file) -o (object file)`
#[arg(long = "cflags", default_values = linker::Linker::DEFAULT_CFLAGS)]
cflags: Vec<String>,
}
impl Args {
fn get_c_compiler(&self) -> String {
if self.cc != "auto" {
self.cc.clone()
} else if let Ok(env_cc) = env::var("CC") {
env_cc
} else {
"cc".into()
}
}
}
fn main_() -> Result<(), String> {
let args = Args::parse();
if args.nya {
println!("hai uwu ^_^");
return Ok(());
}
let inputs = &args.inputs;
let mut linker = linker::Linker::new();
linker.set_cc(&args.get_c_compiler());
let warning_handler = |w| {
// termcolor is a goddamn nightmare to use
// I DONT FUCKING CARE IF WRITING TO STDOUT FAILS
// DONT MAKE ME UNWRAP EVERYTHING
eprintln!("\x1b[93mwarning:\x1b[0m {w}");
};
linker.set_warning_handler(warning_handler);
if inputs.is_empty() {
if cfg!(debug_assertions) {
// ease of use when debugging
linker.add_input("test.o")?;
} else {
return Err("no inputs provided.".into());
}
}
if !args.no_std_lib {
linker.add_input("libc.so.6")?;
}
if args.std_cpp {
linker.add_input("libstdc++.so.6")?;
}
for input in inputs.iter() {
linker.add_input(input)?;
}
linker.link_to_file(&args.output, &args.entry)
}
fn main() {
if let Err(e) = main_() {
eprintln!("\x1b[91merror:\x1b[0m {e}");
}
}
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