* Symptom
```
jdk/src/hotspot/share/oops/symbol.cpp:69: undefined reference to `MetaspaceShared::symbol_space_alloc(unsigned long)'
collect2: error: ld returned 1 exit status
```

* It might be fixed by
```
diff -r 1cfd2ca0b769 src/hotspot/share/memory/metaspaceShared.hpp
--- a/src/hotspot/share/memory/metaspaceShared.hpp Tue May 05 11:10:02 2020 -0700
+++ b/src/hotspot/share/memory/metaspaceShared.hpp Wed May 06 07:05:32 2020 +0800
@@ -309,7 +309,7 @@
 #endif
 
   // Allocate a block of memory from the temporary "symbol" region.
- static char* symbol_space_alloc(size_t num_bytes);
+ static char* symbol_space_alloc(size_t num_bytes) NOT_CDS_RETURN_(NULL);
 
   // Allocate a block of memory from the "mc" or "ro" regions.
   static char* misc_code_space_alloc(size_t num_bytes);
```