Re: LLVM broken on main (arm64)?

Kevin Bowling wrote:
> On Sun, Jul 27, 2025 at 7:36 PM <cyric@mm.st> wrote:
>>
>> Lexi Winter wrote:
>>> Dimitry Andric:
>>>> On 27 Jul 2025, at 12:44, Herbert J. Skuhra <herbert@gojira.at> wrote:
>>>>>
>>>>> after updating from main-n279078-1f2c178e5688 to
>>>>> main-n279105-9b3055d0d4bc (arm64) I have the following issue:
>>>>>
>>>>> $ cc
>>>>> PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed source, and associated run script.
>>>>> Stack dump:
>>>>> 0.      Program arguments: cc
>>>>> 1.      Compilation construction
>>>>> Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
>>>>> 0  libprivatellvm.so.19 0x00000edc041485ec llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 72
>>>>> 1  libprivatellvm.so.19 0x00000edc041464ec llvm::sys::RunSignalHandlers() + 128
>>>>> 2  libprivatellvm.so.19 0x00000edc04148d48 llvm::support::detail::provider_format_adapter<int>::format(llvm::raw_ostream&, llvm::StringRef) + 412
>>>>> 3  libthr.so.3          0x00000edc06bafc38 _pthread_sigmask + 1320
>>>>> Segmentation fault
>>>>
>>>> That's a very short trace, with no useful information. Maybe installworld was half-finished?
>>>
>>> i am seeing something similar on amd64 after updating past 9b3055d0d4bc:
>>>
>>> 1& 1? 172!freebsd15 ~/src/bsd/dev [lf/dev/pkgbase-toolchain]% cc
>>>
>>> PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed source, and associated run script.
>>> Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
>>> 0  libprivatellvm.so.19 0x00001ca34ed8f2c9 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 57
>>> 1  libprivatellvm.so.19 0x00001ca34ed8d185 llvm::sys::RunSignalHandlers() + 85
>>> 2  libprivatellvm.so.19 0x00001ca34ed8f9d7 llvm::support::detail::provider_format_adapter<int>::format(llvm::raw_ostream&, llvm::StringRef) + 375
>>> 3  libthr.so.3          0x00001ca352fc88ec _pthread_sigmask + 1340
>>> 4  libthr.so.3          0x00001ca352fc7ebb pthread_signals_unblock_np + 1467
>>> 5  libthr.so.3          0x00001ca34449d2d3 pthread_signals_unblock_np + 18446744073462962643
>>> 6  libprivatellvm.so.19 0x00001ca34d5b28be llvm::cl::opt<int, false, llvm::cl::parser<int>>::~opt() + 62
>>> 7  libc.so.7            0x00001ca35434131f __cxa_finalize + 351
>>> [2]    5802 bus error (core dumped)  cc
>>>
>>> i'm using pkgbase so unlikely to be a partial install.  could it be that
>>> this change requires a clean build?
>>
>> And it looks like this for me, amd64, WITHOUT_CLEAN build (default):
> 
> Can you confirm if simply setting WITH_LLVM_ASSERTIONS fixes the
> issue?  No clean, no blowing away /usr/obj, etc.  I just need a
> confirmation from someone that a reversion would actually work or if
> we are stuck in for something deeper.
The problem here is that any cc call dumps core and I can't rebuild
anything.  I already wiped the obj directory and now trying to restore
the compiler using llvm19 from packages as suggested in other replies.