diff --git a/src/libstd/net/tcp.rs b/src/libstd/net/tcp.rs
index cdffa390223a2..d8b6fb6da9395 100644
--- a/src/libstd/net/tcp.rs
+++ b/src/libstd/net/tcp.rs
@@ -1597,7 +1597,8 @@ mod tests {
 
     // FIXME: re-enabled openbsd tests once their socket timeout code
     //        no longer has rounding errors.
-    #[cfg_attr(any(target_os = "netbsd", target_os = "openbsd"), ignore)]
+    // VxWorks ignores SO_SNDTIMEO.
+    #[cfg_attr(any(target_os = "netbsd", target_os = "openbsd", target_os = "vxworks"), ignore)]
     #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
     #[test]
     fn timeouts() {
diff --git a/src/libstd/net/udp.rs b/src/libstd/net/udp.rs
index c430e103951f1..a5e7cd992f227 100644
--- a/src/libstd/net/udp.rs
+++ b/src/libstd/net/udp.rs
@@ -1026,7 +1026,8 @@ mod tests {
 
     // FIXME: re-enabled openbsd/netbsd tests once their socket timeout code
     //        no longer has rounding errors.
-    #[cfg_attr(any(target_os = "netbsd", target_os = "openbsd"), ignore)]
+    // VxWorks ignores SO_SNDTIMEO.
+    #[cfg_attr(any(target_os = "netbsd", target_os = "openbsd", target_os = "vxworks"), ignore)]
     #[test]
     fn timeouts() {
         let addr = next_test_ip4();
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 11e6b06d55363..9a3d24facc2c8 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -1727,6 +1727,21 @@ impl<'test> TestCx<'test> {
         }
     }
 
+    fn is_vxworks_pure_static(&self) -> bool {
+        if self.config.target.contains("vxworks") {
+            match env::var("RUST_VXWORKS_TEST_DYLINK") {
+                Ok(s) => s != "1",
+                _ => true
+            }
+        } else {
+            false
+        }
+    }
+
+    fn is_vxworks_pure_dynamic(&self) -> bool {
+        self.config.target.contains("vxworks") && !self.is_vxworks_pure_static()
+    }
+
     fn compose_and_run_compiler(&self, mut rustc: Command, input: Option<String>) -> ProcRes {
         let aux_dir = self.aux_output_dir_name();
 
@@ -1770,6 +1785,7 @@ impl<'test> TestCx<'test> {
                     && !self.config.host.contains("musl"))
                 || self.config.target.contains("wasm32")
                 || self.config.target.contains("nvptx")
+                || self.is_vxworks_pure_static()
             {
                 // We primarily compile all auxiliary libraries as dynamic libraries
                 // to avoid code size bloat and large binaries as much as possible
@@ -2001,7 +2017,8 @@ impl<'test> TestCx<'test> {
         }
 
         if !is_rustdoc {
-            if self.config.target == "wasm32-unknown-unknown" {
+            if self.config.target == "wasm32-unknown-unknown"
+                || self.is_vxworks_pure_static() {
                 // rustc.arg("-g"); // get any backtrace at all on errors
             } else if !self.props.no_prefer_dynamic {
                 rustc.args(&["-C", "prefer-dynamic"]);
@@ -2046,7 +2063,8 @@ impl<'test> TestCx<'test> {
         }
 
         // Use dynamic musl for tests because static doesn't allow creating dylibs
-        if self.config.host.contains("musl") {
+        if self.config.host.contains("musl")
+            || self.is_vxworks_pure_dynamic() {
             rustc.arg("-Ctarget-feature=-crt-static");
         }