secp256k1-sys 0.4.2

FFI for Pieter Wuille's `libsecp256k1` library.
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// Bitcoin secp256k1 bindings
// Written in 2015 by
//   Andrew Poelstra
//
// To the extent possible under law, the author(s) have dedicated all
// copyright and related and neighboring rights to this software to
// the public domain worldwide. This software is distributed without
// any warranty.
//
// You should have received a copy of the CC0 Public Domain Dedication
// along with this software.
// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
//

//! # Build script

// Coding conventions
#![deny(non_upper_case_globals)]
#![deny(non_camel_case_types)]
#![deny(non_snake_case)]
#![deny(unused_mut)]
#![warn(missing_docs)]

extern crate cc;

use std::env;

fn main() {
    // Actual build
    let mut base_config = cc::Build::new();
    base_config.include("depend/secp256k1/")
               .include("depend/secp256k1/include")
               .include("depend/secp256k1/src")
               .flag_if_supported("-Wno-unused-function") // some ecmult stuff is defined but not used upstream
               .define("SECP256K1_API", Some(""))
               .define("ENABLE_MODULE_ECDH", Some("1"))
               .define("ENABLE_MODULE_SCHNORRSIG", Some("1"))
               .define("ENABLE_MODULE_EXTRAKEYS", Some("1"))
               // TODO these three should be changed to use libgmp, at least until secp PR 290 is merged
               .define("USE_NUM_NONE", Some("1"))
               .define("USE_FIELD_INV_BUILTIN", Some("1"))
               .define("USE_SCALAR_INV_BUILTIN", Some("1"));

    if cfg!(feature = "lowmemory") {
        base_config.define("ECMULT_WINDOW_SIZE", Some("4")); // A low-enough value to consume negligible memory
        base_config.define("ECMULT_GEN_PREC_BITS", Some("2"));
    } else {
        base_config.define("ECMULT_GEN_PREC_BITS", Some("4"));
        base_config.define("ECMULT_WINDOW_SIZE", Some("15")); // This is the default in the configure file (`auto`)
    }
    base_config.define("USE_EXTERNAL_DEFAULT_CALLBACKS", Some("1"));
    #[cfg(feature = "recovery")]
    base_config.define("ENABLE_MODULE_RECOVERY", Some("1"));

    // Header files. WASM only.
    if env::var("CARGO_CFG_TARGET_ARCH").unwrap() == "wasm32" {
        base_config.include("wasm-sysroot");
    }

    // secp256k1
    base_config.file("depend/secp256k1/contrib/lax_der_parsing.c")
               .file("depend/secp256k1/src/secp256k1.c")
               .compile("libsecp256k1.a");
}