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Invert all build.rs cfgs

Browse Source 
This allows non-Cargo builds to generally not get involved in cfgs. As
long as one is using a reasonably recent toolchain, no cfgs need to be
set and you'll get a fully-featured build.
This commit is contained in:
David Tolnay
2022-01-01 20:37:51 -08:00
parent 7af97c66b8
commit 55a7cedd73
8 changed files with 104 additions and 99 deletions
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serde/build.rs
+44 -43
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@@ -17,37 +17,38 @@ fn main() {
// std::collections::Bound was stabilized in Rust 1.17
// but it was moved to core::ops later in Rust 1.26:
// https://doc.rust-lang.org/core/ops/enum.Bound.html
if minor >= 26 {
println!("cargo:rustc-cfg=ops_bound");
} else if minor >= 17 && cfg!(feature = "std") {
println!("cargo:rustc-cfg=collections_bound");
if minor < 26 {
println!("cargo:rustc-cfg=no_ops_bound");
if minor < 17 {
println!("cargo:rustc-cfg=no_collections_bound");
}
}
// core::cmp::Reverse stabilized in Rust 1.19:
// https://doc.rust-lang.org/stable/core/cmp/struct.Reverse.html
if minor >= 19 {
println!("cargo:rustc-cfg=core_reverse");
if minor < 19 {
println!("cargo:rustc-cfg=no_core_reverse");
}
// CString::into_boxed_c_str and PathBuf::into_boxed_path stabilized in Rust 1.20:
// https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
// https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.into_boxed_path
if minor >= 20 {
println!("cargo:rustc-cfg=de_boxed_c_str");
println!("cargo:rustc-cfg=de_boxed_path");
if minor < 20 {
println!("cargo:rustc-cfg=no_de_boxed_c_str");
println!("cargo:rustc-cfg=no_de_boxed_path");
}
// From<Box<T>> for Rc<T> / Arc<T> stabilized in Rust 1.21:
// https://doc.rust-lang.org/std/rc/struct.Rc.html#impl-From<Box<T>>
// https://doc.rust-lang.org/std/sync/struct.Arc.html#impl-From<Box<T>>
if minor >= 21 {
println!("cargo:rustc-cfg=de_rc_dst");
if minor < 21 {
println!("cargo:rustc-cfg=no_de_rc_dst");
}
// Duration available in core since Rust 1.25:
// https://blog.rust-lang.org/2018/03/29/Rust-1.25.html#library-stabilizations
if minor >= 25 {
println!("cargo:rustc-cfg=core_duration");
if minor < 25 {
println!("cargo:rustc-cfg=no_core_duration");
}
// 128-bit integers stabilized in Rust 1.26:
@@ -56,56 +57,56 @@ fn main() {
// Disabled on Emscripten targets before Rust 1.40 since
// Emscripten did not support 128-bit integers until Rust 1.40
// (https://github.com/rust-lang/rust/pull/65251)
if minor >= 26 && (!emscripten || minor >= 40) {
println!("cargo:rustc-cfg=integer128");
if minor < 26 || emscripten && minor < 40 {
println!("cargo:rustc-cfg=no_integer128");
}
// Inclusive ranges methods stabilized in Rust 1.27:
// https://github.com/rust-lang/rust/pull/50758
// Also Iterator::try_for_each:
// https://blog.rust-lang.org/2018/06/21/Rust-1.27.html#library-stabilizations
if minor >= 27 {
println!("cargo:rustc-cfg=range_inclusive");
println!("cargo:rustc-cfg=iterator_try_fold");
if minor < 27 {
println!("cargo:rustc-cfg=no_range_inclusive");
println!("cargo:rustc-cfg=no_iterator_try_fold");
}
// Non-zero integers stabilized in Rust 1.28:
// https://blog.rust-lang.org/2018/08/02/Rust-1.28.html#library-stabilizations
if minor >= 28 {
println!("cargo:rustc-cfg=num_nonzero");
if minor < 28 {
println!("cargo:rustc-cfg=no_num_nonzero");
}
// Current minimum supported version of serde_derive crate is Rust 1.31.
if minor >= 31 {
println!("cargo:rustc-cfg=serde_derive");
if minor < 31 {
println!("cargo:rustc-cfg=no_serde_derive");
}
// TryFrom, Atomic types, non-zero signed integers, and SystemTime::checked_add
// stabilized in Rust 1.34:
// https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#tryfrom-and-tryinto
// https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#library-stabilizations
if minor >= 34 {
println!("cargo:rustc-cfg=core_try_from");
println!("cargo:rustc-cfg=num_nonzero_signed");
println!("cargo:rustc-cfg=systemtime_checked_add");
if minor < 34 {
println!("cargo:rustc-cfg=no_core_try_from");
println!("cargo:rustc-cfg=no_num_nonzero_signed");
println!("cargo:rustc-cfg=no_systemtime_checked_add");
}
// Whitelist of archs that support std::sync::atomic module. Ideally we
// would use #[cfg(target_has_atomic = "...")] but it is not stable yet.
// Instead this is based on rustc's compiler/rustc_target/src/spec/*.rs.
let has_atomic64 = target.starts_with("x86_64")
|| target.starts_with("i686")
|| target.starts_with("aarch64")
|| target.starts_with("powerpc64")
|| target.starts_with("sparc64")
|| target.starts_with("mips64el")
|| target.starts_with("riscv64");
let has_atomic32 = has_atomic64 || emscripten;
if has_atomic64 {
println!("cargo:rustc-cfg=std_atomic64");
}
if has_atomic32 {
println!("cargo:rustc-cfg=std_atomic");
}
// Whitelist of archs that support std::sync::atomic module. Ideally we
// would use #[cfg(target_has_atomic = "...")] but it is not stable yet.
// Instead this is based on rustc's compiler/rustc_target/src/spec/*.rs.
let has_atomic64 = target.starts_with("x86_64")
|| target.starts_with("i686")
|| target.starts_with("aarch64")
|| target.starts_with("powerpc64")
|| target.starts_with("sparc64")
|| target.starts_with("mips64el")
|| target.starts_with("riscv64");
let has_atomic32 = has_atomic64 || emscripten;
if minor < 34 || !has_atomic64 {
println!("cargo:rustc-cfg=no_std_atomic64");
}
if minor < 34 || !has_atomic32 {
println!("cargo:rustc-cfg=no_std_atomic");
}
}