e7f8bf125c
Introduce libgit-sys, a Rust wrapper crate that allows Rust code to call functions in libgit.a. This initial patch defines build rules and an interface that exposes user agent string getter functions as a proof of concept. This library can be tested with `cargo test`. In later commits, a higher-level library containing a more Rust-friendly interface will be added at `contrib/libgit-rs`. Symbols in libgit can collide with symbols from other libraries such as libgit2. We avoid this by first exposing library symbols in public_symbol_export.[ch]. These symbols are prepended with "libgit_" to avoid collisions and set to visible using a visibility pragma. In build.rs, Rust builds contrib/libgit-rs/libgit-sys/libgitpub.a, which also contains libgit.a and other dependent libraries, with -fvisibility=hidden to hide all symbols within those libraries that haven't been exposed with a visibility pragma. Co-authored-by: Kyle Lippincott <spectral@google.com> Co-authored-by: Calvin Wan <calvinwan@google.com> Signed-off-by: Calvin Wan <calvinwan@google.com> Signed-off-by: Kyle Lippincott <spectral@google.com> Signed-off-by: Josh Steadmon <steadmon@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
36 lines
1.1 KiB
Rust
36 lines
1.1 KiB
Rust
use std::env;
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use std::path::PathBuf;
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pub fn main() -> std::io::Result<()> {
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let ac = autocfg::new();
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ac.emit_has_path("std::ffi::c_char");
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let crate_root = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap());
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let git_root = crate_root.join("../..");
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let dst = PathBuf::from(env::var_os("OUT_DIR").unwrap());
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let make_output = make_cmd::gnu_make()
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.env("DEVELOPER", "1")
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.env_remove("PROFILE")
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.current_dir(git_root.clone())
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.args([
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"INCLUDE_LIBGIT_RS=YesPlease",
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"contrib/libgit-sys/libgitpub.a",
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])
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.output()
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.expect("Make failed to run");
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if !make_output.status.success() {
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panic!(
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"Make failed:\n stdout = {}\n stderr = {}\n",
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String::from_utf8(make_output.stdout).unwrap(),
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String::from_utf8(make_output.stderr).unwrap()
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);
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}
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std::fs::copy(crate_root.join("libgitpub.a"), dst.join("libgitpub.a"))?;
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println!("cargo:rustc-link-search=native={}", dst.display());
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println!("cargo:rustc-link-lib=gitpub");
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println!("cargo:rerun-if-changed={}", git_root.display());
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Ok(())
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}
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