[Bug libstdc++/88119] New: std::alignment_of returns wrong value (__alignof instead of alignof).
foom at fuhm dot net
gcc-bugzilla@gcc.gnu.org
Tue Nov 20 18:26:00 GMT 2018
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88119
Bug ID: 88119
Summary: std::alignment_of returns wrong value (__alignof
instead of alignof).
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: foom at fuhm dot net
Target Milestone: ---
std::alignment_of is currently defined based on "__alignof__", but according to
the standard [meta.unary.prop.query], it should return the same result as
"alignof".
And as of PR69560, __alignof and alignof now return different values in some
circumstances.
Test case for x86 with -m32, the static assert fails, but it should pass.
====
#include <type_traits>
static_assert(std::alignment_of<double>::value == alignof(double), "");
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