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use std ::env ;
use std ::process ::Command ;
use std ::str ;
fn main ( ) {
println! ( " cargo:rerun-if-changed=build.rs " ) ;
let compiler = match rustc_minor_version ( ) {
Some ( compiler ) = > compiler ,
None = > return ,
} ;
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if compiler > = 80 {
println! ( " cargo:rustc-check-cfg=cfg(doc_cfg) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(no_alloc_crate) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(no_const_vec_new) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(no_exhaustive_int_match) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(no_non_exhaustive) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(no_nonzero_bitscan) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(no_str_strip_prefix) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(no_track_caller) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(no_unsafe_op_in_unsafe_fn_lint) " ) ;
println! ( " cargo:rustc-check-cfg=cfg(test_node_semver) " ) ;
}
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if compiler < 33 {
// Exhaustive integer patterns. On older compilers, a final `_` arm is
// required even if every possible integer value is otherwise covered.
// https://github.com/rust-lang/rust/issues/50907
println! ( " cargo:rustc-cfg=no_exhaustive_int_match " ) ;
}
if compiler < 36 {
// extern crate alloc.
// https://blog.rust-lang.org/2019/07/04/Rust-1.36.0.html#the-alloc-crate-is-stable
println! ( " cargo:rustc-cfg=no_alloc_crate " ) ;
}
if compiler < 39 {
// const Vec::new.
// https://doc.rust-lang.org/std/vec/struct.Vec.html#method.new
println! ( " cargo:rustc-cfg=no_const_vec_new " ) ;
}
if compiler < 40 {
// #[non_exhaustive].
// https://blog.rust-lang.org/2019/12/19/Rust-1.40.0.html#non_exhaustive-structs-enums-and-variants
println! ( " cargo:rustc-cfg=no_non_exhaustive " ) ;
}
if compiler < 45 {
// String::strip_prefix.
// https://doc.rust-lang.org/std/primitive.str.html#method.strip_prefix
println! ( " cargo:rustc-cfg=no_str_strip_prefix " ) ;
}
if compiler < 46 {
// #[track_caller].
// https://blog.rust-lang.org/2020/08/27/Rust-1.46.0.html#track_caller
println! ( " cargo:rustc-cfg=no_track_caller " ) ;
}
if compiler < 52 {
// #![deny(unsafe_op_in_unsafe_fn)].
// https://github.com/rust-lang/rust/issues/71668
println! ( " cargo:rustc-cfg=no_unsafe_op_in_unsafe_fn_lint " ) ;
}
if compiler < 53 {
// Efficient intrinsics for count-leading-zeros and count-trailing-zeros
// on NonZero integers stabilized in 1.53.0. On many architectures these
// are more efficient than counting zeros on ordinary zeroable integers.
// https://doc.rust-lang.org/std/num/struct.NonZeroU64.html#method.leading_zeros
// https://doc.rust-lang.org/std/num/struct.NonZeroU64.html#method.trailing_zeros
println! ( " cargo:rustc-cfg=no_nonzero_bitscan " ) ;
}
}
fn rustc_minor_version ( ) -> Option < u32 > {
let rustc = env ::var_os ( " RUSTC " ) ? ;
let output = Command ::new ( rustc ) . arg ( " --version " ) . output ( ) . ok ( ) ? ;
let version = str ::from_utf8 ( & output . stdout ) . ok ( ) ? ;
let mut pieces = version . split ( '.' ) ;
if pieces . next ( ) ! = Some ( " rustc 1 " ) {
return None ;
}
pieces . next ( ) ? . parse ( ) . ok ( )
}