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authorRobin Krahl <robin.krahl@ireas.org>2020-01-07 11:18:04 +0000
committerDaniel Mueller <deso@posteo.net>2020-01-08 09:20:25 -0800
commit5e20a29b4fdc8a2d442d1093681b396dcb4b816b (patch)
tree55ab083fa8999d2ccbb5e921c1ffe52560dca152 /proc-macro2/build.rs
parent203e691f46d591a2cc8acdfd850fa9f5b0fb8a98 (diff)
downloadnitrocli-5e20a29b4fdc8a2d442d1093681b396dcb4b816b.tar.gz
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Add structopt dependency in version 0.3.7
This patch series replaces argparse with structopt in the argument handling code. As a first step, we need structopt as a dependency. Import subrepo structopt/:structopt at efbdda4753592e27bc430fb01f7b9650b2f3174d Import subrepo bitflags/:bitflags at 30668016aca6bd3b02c766e8347e0b4080d4c296 Import subrepo clap/:clap at 784524f7eb193e35f81082cc69454c8c21b948f7 Import subrepo heck/:heck at 093d56fbf001e1506e56dbfa38631d99b1066df1 Import subrepo proc-macro-error/:proc-macro-error at 6c4cfe79a622c5de8ae68557993542be46eacae2 Import subrepo proc-macro2/:proc-macro2 at d5d48eddca4566e5438e8a2cbed4a74e049544de Import subrepo quote/:quote at 727436c6c137b20f0f34dde5d8fda2679b9747ad Import subrepo rustversion/:rustversion at 0c5663313516263059ce9059ef81fc7a1cf655ca Import subrepo syn-mid/:syn-mid at 5d3d85414a9e6674e1857ec22a87b96e04a6851a Import subrepo syn/:syn at e87c27e87f6f4ef8919d0372bdb056d53ef0d8f3 Import subrepo textwrap/:textwrap at abcd618beae3f74841032aa5b53c1086b0a57ca2 Import subrepo unicode-segmentation/:unicode-segmentation at 637c9874c4fe0c205ff27787faf150a40295c6c3 Import subrepo unicode-width/:unicode-width at 3033826f8bf05e82724140a981d5941e48fce393 Import subrepo unicode-xid/:unicode-xid at 4baae9fffb156ba229665b972a9cd5991787ceb7
Diffstat (limited to 'proc-macro2/build.rs')
-rw-r--r--proc-macro2/build.rs129
1 files changed, 129 insertions, 0 deletions
diff --git a/proc-macro2/build.rs b/proc-macro2/build.rs
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+// 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
+}