On Tue, 7 Nov 2023 23:37:06 GMT, Mikael Vidstedt <mik...@openjdk.org> wrote:
> Oracle is updating the version of GCC for building the JDK on Linux to 13.2.0. > > Apart from the "obvious" changes, I'll add some color to the CompileJvm.gmk > changes. In particular, I ran into two different types of new warnings with > GCC 13.2.0: > > 1. linux-aarch64-debug + stringop-overflow > > `src/hotspot/os_cpu/linux_aarch64/atomic_linux_aarch64.hpp:203:66: error: > 'long unsigned int __atomic_load_8(const volatile void*, int)' writing 8 > bytes into a region of size 0 overflows the destination > [-Werror=stringop-overflow=]` > > Only reproduces with fastdebug on linux-aarch64. I tried to understand why > the warning is generated and how the code could be fixed but eventually had > to give up.. I ended up disabling the warning for linux-aarch64-debug > specifically but open to feedback and other alternatives. > > 2. linux + zero + dangling-pointer > > > `src/hotspot/share/runtime/thread.hpp:579:77: error: storing the address of > local variable 'rm' in '*_thr_current.Thread::_current_resource_mark' > [-Werror=dangling-pointer=]` > > The linux/zero build generates lots and lots of dangling pointer warnings. As > with the first warning I tried to understand why but also gave up in the end. > Like the first warning I disabled it instead, for zero builds. Again > appreciating feedback/suggestions. For `linux-aarch64-debug + stringop-overflow` issue, we met similar things before. See - aarch64 build with gcc-12 (https://bugs.openjdk.org/browse/JDK-8294031), - risc-v build with gcc-12(https://bugs.openjdk.org/browse/JDK-8299580), - risc-v build with gcc-13(https://bugs.openjdk.org/browse/JDK-8315794) It seems to be gcc bugs. AFAIK, we don't come up with better solutions for now and internal discussions are conducted. See https://github.com/openjdk/jdk/pull/11858#issuecomment-1375216441 ------------- PR Comment: https://git.openjdk.org/jdk/pull/16550#issuecomment-1800828525
