https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93325
Bug ID: 93325
Summary: libstdc++ wrongly uses direct clock_gettime syscall on
non-glibc, breaks time64
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: bugdal at aerifal dot cx
Target Milestone: ---
The configure logic for libstdc++ is choosing to make direct clock_gettime
syscalls (via syscall()) rather than using the clock_gettime function except on
glibc 2.17 or later (when it was moved from librt to libc). This is
incompatible with time64 (because struct timespec mismatches the form the old
clock_gettime syscall uses) and also undesirable because it can't take
advantage of vdso.
The hard-coded glibc version dependency is a configure anti-pattern and should
be removed; the right way to test this would be just probing for the
clock_gettime function without adding any libs (like -lrt).
