diff options
Diffstat (limited to 'build.rs')
| -rw-r--r-- | build.rs | 34 |
1 files changed, 15 insertions, 19 deletions
@@ -41,7 +41,6 @@ // 1.57+. use std::env; -use std::iter; use std::process::{self, Command}; use std::str; @@ -85,6 +84,10 @@ fn main() { println!("cargo:rustc-cfg=no_hygiene"); } + if version.minor < 47 { + println!("cargo:rustc-cfg=no_ident_new_raw"); + } + if version.minor < 54 { println!("cargo:rustc-cfg=no_literal_from_str"); } @@ -108,7 +111,10 @@ fn main() { println!("cargo:rustc-cfg=wrap_proc_macro"); } - if version.nightly && feature_allowed("proc_macro_span") { + if version.nightly + && feature_allowed("proc_macro_span") + && feature_allowed("proc_macro_span_shrink") + { println!("cargo:rustc-cfg=proc_macro_span"); } @@ -154,23 +160,13 @@ fn feature_allowed(feature: &str) -> bool { let flags_var; let flags_var_string; - let mut flags_var_split; - let mut flags_none; - let flags: &mut dyn Iterator<Item = &str> = - if let Some(encoded_rustflags) = env::var_os("CARGO_ENCODED_RUSTFLAGS") { - flags_var = encoded_rustflags; - flags_var_string = flags_var.to_string_lossy(); - flags_var_split = flags_var_string.split('\x1f'); - &mut flags_var_split - } else if let Some(rustflags) = env::var_os("RUSTFLAGS") { - flags_var = rustflags; - flags_var_string = flags_var.to_string_lossy(); - flags_var_split = flags_var_string.split(' '); - &mut flags_var_split - } else { - flags_none = iter::empty(); - &mut flags_none - }; + let flags = if let Some(encoded_rustflags) = env::var_os("CARGO_ENCODED_RUSTFLAGS") { + flags_var = encoded_rustflags; + flags_var_string = flags_var.to_string_lossy(); + flags_var_string.split('\x1f') + } else { + return true; + }; for mut flag in flags { if flag.starts_with("-Z") { |