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Diffstat (limited to 'vendor/proc-macro2/build.rs')
-rw-r--r-- | vendor/proc-macro2/build.rs | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/vendor/proc-macro2/build.rs b/vendor/proc-macro2/build.rs new file mode 100644 index 000000000..38404967d --- /dev/null +++ b/vendor/proc-macro2/build.rs @@ -0,0 +1,180 @@ +// rustc-cfg emitted by the build script: +// +// "use_proc_macro" +// Link to extern crate proc_macro. Available on any compiler and any target +// except wasm32. Requires "proc-macro" Cargo cfg to be enabled (default is +// enabled). On wasm32 we never link to proc_macro even if "proc-macro" cfg +// is enabled. +// +// "wrap_proc_macro" +// Wrap types from libproc_macro rather than polyfilling the whole API. +// Enabled on rustc 1.29+ as long as procmacro2_semver_exempt is not set, +// because we can't emulate the unstable API without emulating everything +// else. Also enabled unconditionally on nightly, in which case the +// procmacro2_semver_exempt surface area is implemented by using the +// nightly-only proc_macro API. +// +// "hygiene" +// Enable Span::mixed_site() and non-dummy behavior of Span::resolved_at +// and Span::located_at. Enabled on Rust 1.45+. +// +// "proc_macro_span" +// Enable non-dummy behavior of Span::start and Span::end methods which +// requires an unstable compiler feature. Enabled when building with +// nightly, unless `-Z allow-feature` in RUSTFLAGS disallows unstable +// features. +// +// "super_unstable" +// Implement the semver exempt API in terms of the nightly-only proc_macro +// API. Enabled when using procmacro2_semver_exempt on a nightly compiler. +// +// "span_locations" +// Provide methods Span::start and Span::end which give the line/column +// location of a token. Enabled by procmacro2_semver_exempt or the +// "span-locations" Cargo cfg. This is behind a cfg because tracking +// location inside spans is a performance hit. +// +// "is_available" +// Use proc_macro::is_available() to detect if the proc macro API is +// available or needs to be polyfilled instead of trying to use the proc +// macro API and catching a panic if it isn't available. Enabled on Rust +// 1.57+. + +use std::env; +use std::process::{self, Command}; +use std::str; + +fn main() { + println!("cargo:rerun-if-changed=build.rs"); + + let version = match rustc_version() { + Some(version) => version, + None => return, + }; + + if version.minor < 31 { + eprintln!("Minimum supported rustc version is 1.31"); + process::exit(1); + } + + let docs_rs = env::var_os("DOCS_RS").is_some(); + let semver_exempt = cfg!(procmacro2_semver_exempt) || docs_rs; + if semver_exempt { + // https://github.com/dtolnay/proc-macro2/issues/147 + println!("cargo:rustc-cfg=procmacro2_semver_exempt"); + } + + if semver_exempt || cfg!(feature = "span-locations") { + println!("cargo:rustc-cfg=span_locations"); + } + + if version.minor < 32 { + println!("cargo:rustc-cfg=no_libprocmacro_unwind_safe"); + } + + if version.minor < 39 { + println!("cargo:rustc-cfg=no_bind_by_move_pattern_guard"); + } + + if version.minor < 44 { + println!("cargo:rustc-cfg=no_lexerror_display"); + } + + if version.minor < 45 { + 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"); + } + + if version.minor < 55 { + println!("cargo:rustc-cfg=no_group_open_close"); + } + + if version.minor < 57 { + println!("cargo:rustc-cfg=no_is_available"); + } + + let target = env::var("TARGET").unwrap(); + if !enable_use_proc_macro(&target) { + return; + } + + println!("cargo:rustc-cfg=use_proc_macro"); + + if version.nightly || !semver_exempt { + println!("cargo:rustc-cfg=wrap_proc_macro"); + } + + if version.nightly && feature_allowed("proc_macro_span") { + println!("cargo:rustc-cfg=proc_macro_span"); + } + + if semver_exempt && version.nightly { + println!("cargo:rustc-cfg=super_unstable"); + } +} + +fn enable_use_proc_macro(target: &str) -> bool { + // wasm targets don't have the `proc_macro` crate, disable this feature. + if target.contains("wasm32") { + return false; + } + + // Otherwise, only enable it if our feature is actually enabled. + cfg!(feature = "proc-macro") +} + +struct RustcVersion { + minor: u32, + nightly: bool, +} + +fn rustc_version() -> Option<RustcVersion> { + let rustc = env::var_os("RUSTC")?; + let output = Command::new(rustc).arg("--version").output().ok()?; + let version = str::from_utf8(&output.stdout).ok()?; + let nightly = version.contains("nightly") || version.contains("dev"); + let mut pieces = version.split('.'); + if pieces.next() != Some("rustc 1") { + return None; + } + let minor = pieces.next()?.parse().ok()?; + Some(RustcVersion { minor, nightly }) +} + +fn feature_allowed(feature: &str) -> bool { + // Recognized formats: + // + // -Z allow-features=feature1,feature2 + // + // -Zallow-features=feature1,feature2 + + let flags_var; + let flags_var_string; + 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") { + flag = &flag["-Z".len()..]; + } + if flag.starts_with("allow-features=") { + flag = &flag["allow-features=".len()..]; + return flag.split(',').any(|allowed| allowed == feature); + } + } + + // No allow-features= flag, allowed by default. + true +} |