OpenJDK 16 (ee1d592a9f53+ tip) - compilation error in "sharedRuntime.cpp:2849"

[Chris W. Johnson]

I'm experiencing an OpenJDK build failure on macOS 10.15.7 with OpenJDK 15.0.2 (15.0.2+7-27) and Xcode 12.4 installed. Specifically, a compilation error on line 2849 of "src/hotspot/share/runtime/sharedRuntime.cpp" (see below).

I'm finishing-up a (would-be) OpenJDK contribution, and need to expose it to the full test suite before submission. In the past, I've had no trouble either building OpenJDK 13 through 15 in various states of their development, or passing the test suite. However, this build issue has me stuck. Some aspects of my system configuration have changed since my previous OpenJDK build and test, but a C++ compilation error is not how I'd expect a configuration change to break the build, for whatever my expectations are worth.

Any insights? Is this a symptom of a problem on my side, or is the issue really as straightforward as a compilation problem in the "sharedRuntime.cpp" source?

Thanks in advance,

----Chris

Chris W. Johnson              \ "Workers: Remember, there is no 
--                             \ 'help me, I'm bleeding internally and 
http://www.panojohnson.com/     \  need to see a doctor' in 'team'."






Compiling 944 files for jdk.hotspot.agent
/Users/chrisj/Documents/IdeaProjectsSSD/jdk/src/hotspot/share/runtime/sharedRuntime.cpp:2849:85: error: expression does not compute the number of elements in this array; element type is 'double', not 'relocInfo' [-Werror,-Wsizeof-array-div]
      buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
                                                                          ~~~~~~~~  ^
/Users/chrisj/Documents/IdeaProjectsSSD/jdk/src/hotspot/share/runtime/sharedRuntime.cpp:2848:14: note: array 'locs_buf' declared here
      double locs_buf[20];
             ^
/Users/chrisj/Documents/IdeaProjectsSSD/jdk/src/hotspot/share/runtime/sharedRuntime.cpp:2849:85: note: place parentheses around the 'sizeof(relocInfo)' expression to silence this warning
      buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
                                                                                    ^
1 error generated.
make[3]: *** [/Users/chrisj/Documents/IdeaProjectsSSD/jdk/build/macosx-x86_64-server-release/hotspot/variant-server/libjvm/objs/sharedRuntime.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [hotspot-server-libs] Error 2

ERROR: Build failed for target 'images' in configuration 'macosx-x86_64-server-release' (exit code 2) 
Stopping sjavac server

=== Output from failing command(s) repeated here ===
* For target hotspot_variant-server_libjvm_objs_sharedRuntime.o:
/Users/chrisj/Documents/IdeaProjectsSSD/jdk/src/hotspot/share/runtime/sharedRuntime.cpp:2849:85: error: expression does not compute the number of elements in this array; element type is 'double', not 'relocInfo' [-Werror,-Wsizeof-array-div]
      buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
                                                                          ~~~~~~~~  ^
/Users/chrisj/Documents/IdeaProjectsSSD/jdk/src/hotspot/share/runtime/sharedRuntime.cpp:2848:14: note: array 'locs_buf' declared here
      double locs_buf[20];
             ^
/Users/chrisj/Documents/IdeaProjectsSSD/jdk/src/hotspot/share/runtime/sharedRuntime.cpp:2849:85: note: place parentheses around the 'sizeof(relocInfo)' expression to silence this warning
      buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
                                                                                    ^
1 error generated.

* All command lines available in /Users/chrisj/Documents/IdeaProjectsSSD/jdk/build/macosx-x86_64-server-release/make-support/failure-logs.
=== End of repeated output ===