use build_helper::output;
+fn detect_llvm_link(llvm_config: &Path) -> (&'static str, Option<&'static str>) {
+ let mut version_cmd = Command::new(llvm_config);
+ version_cmd.arg("--version");
+ let version_output = output(&mut version_cmd);
+ let mut parts = version_output.split('.').take(2)
+ .filter_map(|s| s.parse::<u32>().ok());
+ if let (Some(major), Some(minor)) = (parts.next(), parts.next()) {
+ if major > 3 || (major == 3 && minor >= 9) {
+ // Force the link mode we want, preferring static by default, but
+ // possibly overridden by `configure --enable-llvm-link-shared`.
+ if env::var_os("LLVM_LINK_SHARED").is_some() {
+ return ("dylib", Some("--link-shared"));
+ } else {
+ return ("static", Some("--link-static"));
+ }
+ } else if major == 3 && minor == 8 {
+ // Find out LLVM's default linking mode.
+ let mut mode_cmd = Command::new(llvm_config);
+ mode_cmd.arg("--shared-mode");
+ if output(&mut mode_cmd).trim() == "shared" {
+ return ("dylib", None);
+ } else {
+ return ("static", None);
+ }
+ }
+ }
+ ("static", None)
+}
+
fn main() {
println!("cargo:rustc-cfg=cargobuild");
.cpp_link_stdlib(None) // we handle this below
.compile("librustllvm.a");
- // Find out LLVM's default linking mode.
- let mut cmd = Command::new(&llvm_config);
- cmd.arg("--shared-mode");
- let mut llvm_kind = if output(&mut cmd).trim() == "shared" {
- "dylib"
- } else {
- "static"
- };
+ let (llvm_kind, llvm_link_arg) = detect_llvm_link(&llvm_config);
// Link in all LLVM libraries, if we're uwring the "wrong" llvm-config then
// we don't pick up system libs because unfortunately they're for the host
let mut cmd = Command::new(&llvm_config);
cmd.arg("--libs");
- // Force static linking with "--link-static" if available, or
- // force "--link-shared" if the configuration requested it.
- let llvm_link_shared = env::var_os("LLVM_LINK_SHARED").is_some();
- let mut version_cmd = Command::new(&llvm_config);
- version_cmd.arg("--version");
- let version_output = output(&mut version_cmd);
- let mut parts = version_output.split('.');
- if let (Some(major), Some(minor)) = (parts.next().and_then(|s| s.parse::<u32>().ok()),
- parts.next().and_then(|s| s.parse::<u32>().ok())) {
- if major > 3 || (major == 3 && minor >= 9) {
- if llvm_link_shared {
- cmd.arg("--link-shared");
- llvm_kind = "dylib";
- } else {
- cmd.arg("--link-static");
- llvm_kind = "static";
- }
- }
+ if let Some(link_arg) = llvm_link_arg {
+ cmd.arg(link_arg);
}
if !is_crossed {