feat: support build and link dynamic library

src/lib.rs

@@ -1434,10 +1434,10 @@ impl Build {
                 .arg(dst.join(dynlib_name))
                 .args(&objects);
             run(cmd, &self.cargo_output)?;
+        } else {
+            self.assemble(lib_name, &dst.join(static_name), &objects)?;
         }
 
-        self.assemble(lib_name, &dst.join(static_name), &objects)?;
-
         let target = self.get_target()?;
         if target.env == "msvc" {
             let compiler = self.get_base_compiler()?;

tests/test.rs

@@ -354,6 +354,37 @@ fn gnu_shared() {
     test.cmd(0).must_have("-shared").must_not_have("-static");
 }
 
+#[test]
+#[cfg(target_os = "linux")]
+fn gnu_link_shared() {
+    use std::process::Command;
+
+    let output = Command::new("rustc").arg("-vV").output().unwrap();
+    let stdout_buf = String::from_utf8(output.stdout).unwrap();
+    let target = stdout_buf
+        .lines()
+        .find_map(|l| l.strip_prefix("host: "))
+        .unwrap();
+
+    reset_env();
+    let test = Test::gnu();
+    let root_dir = env!("CARGO_MANIFEST_DIR");
+    let src = format!("{root_dir}/dev-tools/cc-test/src/foo.c");
+
+    cc::Build::new()
+        .host(target)
+        .target(target)
+        .opt_level(2)
+        .out_dir(test.td.path())
+        .file(&src)
+        .shared_flag(true)
+        .static_flag(false)
+        .link_shared_flag(true)
+        .compile("foo");
+
+    assert!(test.td.path().join("libfoo.so").exists());
+}
+
 #[test]
 fn gnu_flag_if_supported() {
     reset_env();