avoid dynamic linking on targets that do not support dynamic linking

Author: pietroalbini

src/tools/compiletest/src/common.rs

@@ -542,6 +542,8 @@ pub struct TargetCfg {
     endian: Endian,
     #[serde(rename = "panic-strategy", default)]
     pub(crate) panic: PanicStrategy,
+    #[serde(default)]
+    pub(crate) dynamic_linking: bool,
 }
 
 impl TargetCfg {

src/tools/compiletest/src/runtest.rs

@@ -1810,8 +1810,8 @@ impl<'test> TestCx<'test> {
             || self.config.target.contains("wasm32")
             || self.config.target.contains("nvptx")
             || self.is_vxworks_pure_static()
-            || self.config.target.contains("sgx")
             || self.config.target.contains("bpf")
+            || !self.config.target_cfg().dynamic_linking
         {
             // We primarily compile all auxiliary libraries as dynamic libraries
             // to avoid code size bloat and large binaries as much as possible