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author | Chih-Hung Hsieh <chh@google.com> | 2020-03-17 13:21:42 -0700 |
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committer | Chih-Hung Hsieh <chh@google.com> | 2020-03-19 11:32:03 -0700 |
commit | 04bf40bbb86733c28bc3470599898d75f299312d (patch) | |
tree | e46117a598c2cfff81968d79e3a7eab7865a1b47 /build.rs | |
parent | 63ebae0e99c74e1c9170a005b561f0994bb0a906 (diff) | |
download | syn-04bf40bbb86733c28bc3470599898d75f299312d.tar.gz |
Remove old 0.15.42; used only by old crosvm.
* 1.0.7 becomes the default
Test: make
Bug: 151628085
Change-Id: Iad2f9c69b43d0bbf66fadce54078b11e98cc582e
Diffstat (limited to 'build.rs')
-rw-r--r-- | build.rs | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/build.rs b/build.rs new file mode 100644 index 00000000..c0f9ed34 --- /dev/null +++ b/build.rs @@ -0,0 +1,63 @@ +use std::env; +use std::process::Command; +use std::str::{self, FromStr}; + +// The rustc-cfg strings below are *not* public API. Please let us know by +// opening a GitHub issue if your build environment requires some way to enable +// these cfgs other than by executing our build script. +fn main() { + let compiler = match rustc_version() { + Some(compiler) => compiler, + None => return, + }; + + if compiler.minor < 36 { + println!("cargo:rustc-cfg=syn_omit_await_from_token_macro"); + } + + if !compiler.nightly { + println!("cargo:rustc-cfg=syn_disable_nightly_tests"); + } +} + +struct Compiler { + minor: u32, + nightly: bool, +} + +fn rustc_version() -> Option<Compiler> { + let rustc = match env::var_os("RUSTC") { + Some(rustc) => rustc, + None => return None, + }; + + let output = match Command::new(rustc).arg("--version").output() { + Ok(output) => output, + Err(_) => return None, + }; + + let version = match str::from_utf8(&output.stdout) { + Ok(version) => version, + Err(_) => return None, + }; + + let mut pieces = version.split('.'); + if pieces.next() != Some("rustc 1") { + return None; + } + + let next = match pieces.next() { + Some(next) => next, + None => return None, + }; + + let minor = match u32::from_str(next) { + Ok(minor) => minor, + Err(_) => return None, + }; + + Some(Compiler { + minor: minor, + nightly: version.contains("nightly"), + }) +} |