https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93962
--- Comment #6 from Gerald Pfeifer <gerald at pfeifer dot com> --- (In reply to Jeffrey A. Law from comment #3) > Gerald, I wanted to reproduce the error so that I could in turn verify the > proposed fix of using std:abs would work. I verified that the fix of using std::abs works in the situation where I had failures without. > So I installed FreeBSD 11.3 (i686) in a VM. Bootstrap with GCC went fine. > I couldn't get the failure building with clang either. I looked into this. Indeed my regular bootstraps do not fail, even without this patch. It is building the lang/gcc10-devel port, based on our weekly snapshots, that exhibited this behavior. > How are you configuring & building? Are you familiar with the FreeBSD ports system? The port resides in ports/lang/gcc10-devel and to reproduce the issue you need to remove ports/lang/gcc10-devel/files/patch-value-prof.c-buildfix that I added. I have not found yet why a "regular" bootstrap succeeds and fails in my environment when I build it as a port, but will try to dig into it this evening. > So while I believe Andrew is right that this should be using std::abs, I'd > still like to reproduce the problem and verify that using std::abs is > sufficient to fix. The fix is confirmed, and part of the FreeBSD ports tree now. However, I am not yet able to explain why it does occur in one case and not in the other.
