Some minor tweaks.

environment.py

@@ -201,7 +201,13 @@ class VisualStudioCCompiler(CCompiler):
 
     def get_linker_output_flags(self, outputname):
         return ['/OUT:' + outputname]
-    
+
+    def get_pic_flags(self):
+        return []
+
+    def get_std_shared_lib_link_flags(self):
+        return []
+
     def sanity_check(self, work_dir):
         source_name = os.path.join(work_dir, 'sanitycheckc.c')
         binary_name = os.path.join(work_dir, 'sanitycheckc')

test cases/common/4 shared/libfile.c

@@ -1,3 +1,14 @@
-int libfunc() {
+#if defined _WIN32 || defined __CYGWIN__
+  #define DLL_PUBLIC __declspec(dllexport)
+#else
+  #if defined __GNUC__
+    #define DLL_PUBLIC __attribute__ ((visibility("default")))
+  #else
+    #pragma message ("Compiler does not support symbol visibility.")
+    #define DLL_PUBLIC
+  #endif
+#endif
+
+int DLL_PUBLIC libfunc() {
     return 3;
 }