https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81749
Bug ID: 81749
Summary: std::align: runtime error: negation of 8 cannot be
represented in type 'size_t'
Product: gcc
Version: 7.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: max at maxbruckner dot de
Target Milestone: ---
Created attachment 41944
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41944&action=edit
C++ file to reproduce the error
When compiling code with clangs undefined behavior sanitizer (clang++ 4.0.1
-fsanitize=unsigned-integer-overflow) that uses std::align, a runtime error
occurs:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/memory:117:54:
runtime error: negation of 8 cannot be represented in type 'size_t' (aka
'unsigned long')
The issue can be reproduced with the C++ and Makefile from the attachments.
The full output of my test:
alignof(intmax_t) = 8
alloced = 0x5606f17e7c21
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../include/c++/7.1.1/memory:117:54:
runtime error: negation of 8 cannot be represented in type 'size_t' (aka
'unsigned long')
address = 0x5606f17e7c28
space = 92
