GCC 8 reports an error:

* For target support_native_java.base_libjli_java_md_solinux.o:
src/java.base/unix/native/libjli/java_md_solinux.c: In function 'ContinueInNewThread0':
src/java.base/unix/native/libjli/java_md_solinux.c:747:37: error: cast between incompatible function types from 'int (*)(void *)' to 'void * (*)(void *)' [-Werror=cast-function-type]
     if (pthread_create(&tid, &attr, (void *(*)(void*))continuation, (void*)args) == 0) {
                                     ^

It can be silenced by explicit intermediate cast of continuation to void*.