rug 0.8.0

Arbitrary-precision integers, rational, floating-point and complex numbers based on GMP, MPFR and MPC
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

// Copyright © 2017 University of Malta

// This program is free software: you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// this program. If not, see <http://www.gnu.org/licenses/>.

use std::env;

fn main() {
    if env::var_os("CARGO_FEATURE_GMP_MPFR_SYS").is_some() {
        let bits = env::var_os("DEP_GMP_LIMB_BITS")
            .expect("DEP_GMP_LIMB_BITS not set by gmp-mfpr-sys");
        let bits = bits.to_str()
            .expect("DEP_GMP_LIMB_BITS contains unexpected characters");
        if bits != "32" && bits != "64" {
            panic!("Limb bits not 32 or 64: \"{}\"", bits);
        }
        println!("cargo:rustc-cfg=gmp_limb_bits_{}", bits);
    }
}