And I enjoy using the C preprocessor also.
Trying out Rust.
But I must have those "tables", and the Rust macros are not good, so I must have the C preprocessor.
Cargo.toml:
[build-dependencies]
cc = "1.0"
build.rs:
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::Path;
extern crate cc;
fn main() {
let out_dir = env::var("OUT_DIR").unwrap();
let dest_path = Path::new(&out_dir).join("wasm_instructions.rs");
let mut f = File::create(&dest_path).unwrap();
let c = &mut cc::Build::new();
c.flag("-I.").file("src/wasm_instructions.h");
// Preprocess w/o line numbers
// -EP for Visual C++
// -E -P for gcc
//
// TODO Compiler detection.
//
// Nothing works, so remove line directives ourselves.
for s in String::from_utf8(c.expand()).unwrap().lines() {
let bytes = s.as_bytes();
if bytes.len() > 0 && bytes [0] != b'#' {
f.write(bytes).unwrap();
f.write(b"\n").unwrap();
}
}
}
The .h file looks like this:
#ifdef FOO FOO(...) FOO(...) #else #undef FOO #define FOO(...) #include __FILE__ #undef FOO #define FOO(...) #include __FILE__ #endif
