upstream/mercurial-mirror Files · rust/hg-core/build.rs

rust-matchers: use the `regex` crate...

rust-matchers: use the `regex` crate Instead of falling back to Python when a code path with "ignore" functionality is reached and `Re2` is not installed, the default compilation (i.e. without the `with-re2` feature) will use the `regex` crate for all regular expressions business. As with the introduction of `Re2` in a previous series, this yields a big performance boost compared to the Python + C code in `status`, `diff`, `commit`, `update`, and maybe others. For now `Re2` looks to be faster at compiling the DFA (1.5ms vs 5ms for Netbeans' `.hgignore`) and a bit faster in actual use: (123ms vs 137ms for the parallel traversal of Netbeans' clean repo). I am in talks with the author of `regex` to see whether that performance difference is a bug, a "won't fix", or a tuning issue. The `regex` crate is already one of our dependencies and using this code does not require any additional work from the end-user than to use the Rust extensions. Differential Revision: https://phab.mercurial-scm.org/D8323

Raphaël Gomès - - Load All Authors

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             build.rs
        
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                | application/rls-services+xml
            
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             / rust / hg-core / build.rs
          
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      // build.rs

      //

      // Copyright 2020 Raphaël Gomès <rgomes@octobus.net>

      //

      // This software may be used and distributed according to the terms of the

      // GNU General Public License version 2 or any later version.

      #[cfg(feature = "with-re2")]

      use cc;

      #[cfg(feature = "with-re2")]

      fn compile_re2() {

          cc::Build::new()

              .cpp(true)

              .flag("-std=c++11")

              .file("src/re2/rust_re2.cpp")

              .compile("librustre.a");

          println!("cargo:rustc-link-lib=re2");

      }

      fn main() {

          #[cfg(feature = "with-re2")]

          compile_re2();

      }

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				// build.rs
				//
				// Copyright 2020 Raphaël Gomès <rgomes@octobus.net>
				//
				// This software may be used and distributed according to the terms of the
				// GNU General Public License version 2 or any later version.

				#[cfg(feature = "with-re2")]
				use cc;

				#[cfg(feature = "with-re2")]
				fn compile_re2() {
				cc::Build::new()
				.cpp(true)
				.flag("-std=c++11")
				.file("src/re2/rust_re2.cpp")
				.compile("librustre.a");

				println!("cargo:rustc-link-lib=re2");
				}

				fn main() {
				#[cfg(feature = "with-re2")]
				compile_re2();
				}