Add ldflags option

Author: TartanLlama

crates/test/README.md

@@ -314,9 +314,10 @@ separate crate and passed as `--extern`
 
 #### Configuration: C
 
-C/C++ configuration supports configuring compilation flags at this time:
+C/C++ configuration supports configuring compilation and linker flags at this time:
 
 ```rust
 //@ [lang]
 //@ cflags = '-O'
+//@ ldflags = "-Wl,--export-table"
 ```

crates/test/src/c.rs

@@ -28,6 +28,9 @@ struct LangConfig {
     /// Space-separated list or array of compiler flags to pass.
     #[serde(default)]
     cflags: StringList,
+    /// Space-separated list or array of linker flags to pass.
+    #[serde(default)]
+    ldflags: StringList,
 }
 
 fn clang(runner: &Runner<'_>) -> PathBuf {
@@ -139,12 +142,14 @@ fn compile(runner: &Runner<'_>, compile: &Compile<'_>, compiler: PathBuf) -> Res
         .arg("-Wc++-compat")
         .arg("-Wno-unused-parameter")
         .arg("-g")
-        .arg("-Wl,--export-table")
         .arg("-o")
         .arg(&output);
     for flag in Vec::from(config.cflags) {
         cmd.arg(flag);
     }
+    for flag in Vec::from(config.ldflags) {
+        cmd.arg(flag);
+    }
     cmd.arg("-mexec-model=reactor");
     if produces_component(runner) {
         cmd.arg("-Wl,--skip-wit-component");

tests/runtime-async/async/threading-builtins/test.c

@@ -1,4 +1,6 @@
 //@ args = '--rename a:b/i=test'
+//@ [lang]
+//@ ldflags = "-Wl,--export-table"
 
 #include <assert.h>
 #include <test.h>