diff options
Diffstat (limited to 'vendor/num-traits/build.rs')
| -rw-r--r-- | vendor/num-traits/build.rs | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/vendor/num-traits/build.rs b/vendor/num-traits/build.rs index 891fa09b1..c7bf364f1 100644 --- a/vendor/num-traits/build.rs +++ b/vendor/num-traits/build.rs @@ -4,15 +4,26 @@ use std::env; fn main() { let ac = autocfg::new(); - if ac.probe_type("i128") { - println!("cargo:rustc-cfg=has_i128"); - } else if env::var_os("CARGO_FEATURE_I128").is_some() { - panic!("i128 support was not detected!"); + + // If the "i128" feature is explicity requested, don't bother probing for it. + // It will still cause a build error if that was set improperly. + if env::var_os("CARGO_FEATURE_I128").is_some() || ac.probe_type("i128") { + autocfg::emit("has_i128"); } + ac.emit_expression_cfg( "unsafe { 1f64.to_int_unchecked::<i32>() }", "has_to_int_unchecked", ); + ac.emit_expression_cfg("1u32.reverse_bits()", "has_reverse_bits"); + ac.emit_expression_cfg("1u32.trailing_ones()", "has_leading_trailing_ones"); + ac.emit_expression_cfg("{ let mut x = 1; x += &2; }", "has_int_assignop_ref"); + ac.emit_expression_cfg("1u32.div_euclid(1u32)", "has_div_euclid"); + + if env::var_os("CARGO_FEATURE_STD").is_some() { + ac.emit_expression_cfg("1f64.copysign(-1f64)", "has_copysign"); + } + autocfg::rerun_path("build.rs"); } |