rust-secp256k1-unsafe-fast/secp256k1-sys/build.rs

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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)]
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extern crate cc;
use std::env;
fn main() {
// Check whether we can use 64-bit compilation
let use_64bit_compilation = if env::var("CARGO_CFG_TARGET_POINTER_WIDTH").unwrap() == "64" {
let check = cc::Build::new().file("depend/check_uint128_t.c")
.cargo_metadata(false)
.try_compile("check_uint128_t")
.is_ok();
if !check {
println!("cargo:warning=Compiling in 32-bit mode on a 64-bit architecture due to lack of uint128_t support.");
}
check
} else {
false
};
// Actual build
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let mut base_config = cc::Build::new();
base_config.include("depend/secp256k1/")
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.include("depend/secp256k1/include")
.include("depend/secp256k1/src")
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.flag_if_supported("-Wno-unused-function") // some ecmult stuff is defined but not used upstream
.define("SECP256K1_BUILD", 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"))
.define("ENABLE_MODULE_ECDH", Some("1"));
if cfg!(feature = "lowmemory") {
base_config.define("ECMULT_WINDOW_SIZE", Some("4")); // A low-enough value to consume neglible memory
} else {
base_config.define("ECMULT_WINDOW_SIZE", Some("15")); // This is the default in the configure file (`auto`)
}
#[cfg(not(feature = "dont_replace_c_symbols"))]
base_config.define("USE_EXTERNAL_DEFAULT_CALLBACKS", Some("1"));
#[cfg(feature = "endomorphism")]
base_config.define("USE_ENDOMORPHISM", Some("1"));
#[cfg(feature = "recovery")]
base_config.define("ENABLE_MODULE_RECOVERY", Some("1"));
if let Ok(target_endian) = env::var("CARGO_CFG_TARGET_ENDIAN") {
if target_endian == "big" {
base_config.define("WORDS_BIGENDIAN", Some("1"));
}
}
if use_64bit_compilation {
base_config.define("USE_FIELD_5X52", Some("1"))
.define("USE_SCALAR_4X64", Some("1"))
.define("HAVE___INT128", Some("1"));
} else {
base_config.define("USE_FIELD_10X26", Some("1"))
.define("USE_SCALAR_8X32", Some("1"));
}
// secp256k1
base_config.file("depend/secp256k1/contrib/lax_der_parsing.c")
.file("depend/secp256k1/src/secp256k1.c")
.compile("libsecp256k1.a");
}