https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70975
--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
Does following patch work:
--cut here--
diff --git a/libstdc++-v3/src/filesystem/ops.cc
b/libstdc++-v3/src/filesystem/ops.cc
index 9abcee0..b709858 100644
--- a/libstdc++-v3/src/filesystem/ops.cc
+++ b/libstdc++-v3/src/filesystem/ops.cc
@@ -444,7 +444,9 @@ namespace
}
#ifdef _GLIBCXX_USE_SENDFILE
- const auto n = ::sendfile(out.fd, in.fd, nullptr, from_st->st_size);
+ off_t always_zero_offset = 0;
+ const auto n = ::sendfile(out.fd, in.fd,
+ &always_zero_offset, from_st->st_size);
if (n < 0 && (errno == ENOSYS || errno == EINVAL))
{
#endif
--cut here--
