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use std::env;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rustc-check-cfg=cfg(fast_arithmetic, values(\"32\", \"64\"))");
// Decide ideal limb width for arithmetic in the float parser and string
// parser.
let target_arch = env::var_os("CARGO_CFG_TARGET_ARCH").unwrap();
let target_pointer_width = env::var_os("CARGO_CFG_TARGET_POINTER_WIDTH").unwrap();
if target_arch == "aarch64"
|| target_arch == "loongarch64"
|| target_arch == "mips64"
|| target_arch == "powerpc64"
|| target_arch == "wasm32"
|| target_arch == "x86_64"
|| target_pointer_width == "64"
{
// The above list of architectures are ones that have native support for
// 64-bit arithmetic, but which have some targets using a smaller
// pointer width. Examples include aarch64-unknown-linux-gnu_ilp32 and
// x86_64-unknown-linux-gnux32. So our choice of limb width is not
// equivalent to using usize everywhere.
println!("cargo:rustc-cfg=fast_arithmetic=\"64\"");
} else {
println!("cargo:rustc-cfg=fast_arithmetic=\"32\"");
}
}
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