1 files changed, 0 insertions, 129 deletions
diff --git a/proc-macro2/build.rs b/proc-macro2/build.rs
deleted file mode 100644
index deb9b92..0000000
--- a/proc-macro2/build.rs
+++ /dev/null
@@ -1,129 +0,0 @@
-// 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.
-//
-// "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.
-
-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 semver_exempt = cfg!(procmacro2_semver_exempt);
-    if semver_exempt {
-        // https://github.com/alexcrichton/proc-macro2/issues/147
-        println!("cargo:rustc-cfg=procmacro2_semver_exempt");
-    }
-
-    if semver_exempt || cfg!(feature = "span-locations") {
-        println!("cargo:rustc-cfg=span_locations");
-    }
-
-    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
-
-    if let Some(rustflags) = env::var_os("RUSTFLAGS") {
-        for mut flag in rustflags.to_string_lossy().split(' ') {
-            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
-}