compiletest: Support #[crate_type = "bin"] in auxiliary crates

To support ui tests with auxiliary programs. (See next commmit.)

Author: Enselic

src/tools/compiletest/src/runtest.rs

@@ -82,22 +82,21 @@ fn disable_error_reporting<F: FnOnce() -> R, R>(f: F) -> R {
 }
 
 /// The platform-specific library name
-fn get_lib_name(lib: &str, aux_type: AuxType) -> String {
+fn get_lib_name(lib: &str, aux_type: AuxType) -> Option<String> {
     match aux_type {
+        AuxType::Bin => None,
         // In some casess (e.g. MUSL), we build a static
         // library, rather than a dynamic library.
         // In this case, the only path we can pass
         // with '--extern-meta' is the '.rlib' file
-        AuxType::Lib => format!("lib{}.rlib", lib),
-        AuxType::Dylib => {
-            if cfg!(windows) {
-                format!("{}.dll", lib)
-            } else if cfg!(target_os = "macos") {
-                format!("lib{}.dylib", lib)
-            } else {
-                format!("lib{}.so", lib)
-            }
-        }
+        AuxType::Lib => Some(format!("lib{}.rlib", lib)),
+        AuxType::Dylib => Some(if cfg!(windows) {
+            format!("{}.dll", lib)
+        } else if cfg!(target_os = "macos") {
+            format!("lib{}.dylib", lib)
+        } else {
+            format!("lib{}.so", lib)
+        }),
     }
 }
 
@@ -2152,7 +2151,14 @@ impl<'test> TestCx<'test> {
             let aux_type = self.build_auxiliary(of, &aux_path, &aux_dir);
             let lib_name =
                 get_lib_name(&aux_path.trim_end_matches(".rs").replace('-', "_"), aux_type);
-            rustc.arg("--extern").arg(format!("{}={}/{}", aux_name, aux_dir.display(), lib_name));
+            if let Some(lib_name) = lib_name {
+                rustc.arg("--extern").arg(format!(
+                    "{}={}/{}",
+                    aux_name,
+                    aux_dir.display(),
+                    lib_name
+                ));
+            }
         }
     }
 
@@ -2201,7 +2207,15 @@ impl<'test> TestCx<'test> {
         }
         aux_rustc.envs(aux_props.rustc_env.clone());
 
-        let (aux_type, crate_type) = if aux_props.no_prefer_dynamic {
+        // Obviously a hack, but should work OK for now.
+        let is_bin = std::fs::read_to_string(input_file)
+            .unwrap()
+            .lines()
+            .any(|l| l == "#![crate_type = \"bin\"]");
+
+        let (aux_type, crate_type) = if is_bin {
+            (AuxType::Bin, None)
+        } else if aux_props.no_prefer_dynamic {
             (AuxType::Dylib, None)
         } else if self.config.target.contains("emscripten")
             || (self.config.target.contains("musl")
@@ -4913,6 +4927,7 @@ enum LinkToAux {
 }
 
 enum AuxType {
+    Bin,
     Lib,
     Dylib,
 }