30 lines
949 B
Rust
30 lines
949 B
Rust
extern crate autocfg;
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use std::env;
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fn main() {
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let ac = autocfg::new();
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// If the "i128" feature is explicity requested, don't bother probing for it.
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// It will still cause a build error if that was set improperly.
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if env::var_os("CARGO_FEATURE_I128").is_some() || ac.probe_type("i128") {
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autocfg::emit("has_i128");
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}
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ac.emit_expression_cfg(
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"unsafe { 1f64.to_int_unchecked::<i32>() }",
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"has_to_int_unchecked",
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);
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ac.emit_expression_cfg("1u32.reverse_bits()", "has_reverse_bits");
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ac.emit_expression_cfg("1u32.trailing_ones()", "has_leading_trailing_ones");
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ac.emit_expression_cfg("{ let mut x = 1; x += &2; }", "has_int_assignop_ref");
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ac.emit_expression_cfg("1u32.div_euclid(1u32)", "has_div_euclid");
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if env::var_os("CARGO_FEATURE_STD").is_some() {
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ac.emit_expression_cfg("1f64.copysign(-1f64)", "has_copysign");
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}
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autocfg::rerun_path("build.rs");
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}
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