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Use pkg-config to generate sqlite link dependencies

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When built as a static library, sqlite (or sqlcipher) doesn't carry
additional link dependencies with it, and the libsqlite3-sys rlib
doesn't pick them up either. A dependent crate attempting to link
against rusqlite then has to specify these additional link commands,
and even then they need to be specified before the libsqlite3-sys
rlib is specified on the command line.

Fix this by attempting to use pkg-config when the
(SQLITE3|SQLCIPHER)_LIB_DIR is specified, since these builds produce
the pkg-config link dependency information, and the pkg_config crate
can automatically generate the correct link commands using that.

(Additionally, since (SQLITE3|SQLCIPHER)_STATIC is already defined,
or not, the --static flag will be correctly configured for pkg_config)
This commit is contained in:
Will Davis 2019-02-04 22:53:57 -06:00
parent df493bb217
commit 9f009fe1e0
1 changed files with 8 additions and 2 deletions
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10
libsqlite3-sys/build.rs
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@ -134,8 +134,14 @@ mod build {
}
// Allow users to specify where to find SQLite.
if let Ok(dir) = env::var(format!("{}_LIB_DIR", env_prefix())) {
println!("cargo:rustc-link-lib={}={}", find_link_mode(), link_lib);
println!("cargo:rustc-link-search={}", dir);
// Try to use pkg-config to determine link commands
let pkgconfig_path = Path::new(&dir).join("pkgconfig");
env::set_var("PKG_CONFIG_PATH", pkgconfig_path);
if let Err(_) = pkg_config::Config::new().probe(link_lib) {
// Otherwise just emit the bare minimum link commands.
println!("cargo:rustc-link-lib={}={}", find_link_mode(), link_lib);
println!("cargo:rustc-link-search={}", dir);
}
return HeaderLocation::FromEnvironment;
}