ADDITIONAL SYSTEM INFORMATION :
macOS 10.14.6, OpenJDK 12.0.2+10

A DESCRIPTION OF THE PROBLEM :
The bug reported in https://bugs.openjdk.java.net/browse/JDK-8223309 also occurs for OpenJDK 12.

Applying the same changes which were made for OpenJDK 13 fixes the issue.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
bash ./configure --with-toolchain-path=/usr/bin --with-extra-ldflags=-headerpad_max_install_names --with-debug-level=release --with-native-debug-symbols=none --enable-dtrace=auto --with-jvm-variants=server

make images

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No error.
ACTUAL -
test/hotspot/gtest/classfile/test_symbolTable.cpp:62:6: error: explicitly assigning value of variable of type 'TempNewSymbol' to itself [-Werror,-Wself-assign-overloaded]
s1 = s1; // self assignment