https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95197
Bug ID: 95197
Summary: libgomp/testsuite/libgomp.c++/for-27.C fails with
-std=c++17
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
Target Milestone: ---
See <https://gcc.gnu.org/pipermail/gcc-patches/2020-May/545879.html> for why
this fails. My workaround was
--- a/libgomp/testsuite/libgomp.c++/for-27.C
+++ b/libgomp/testsuite/libgomp.c++/for-27.C
@@ -151,6 +151,12 @@ f4 (const I<int> &x, const I<int> &y)
else if (results[i]) \
abort ()
+// FIXME: OpenMP seems to count on this being instantiated; the copy
+// constructor is called in functions fn2/fn3/fn4. But in C++17 we
+// elide this copy constructor, so it's never been instantiated. For
+// now instantiate it explicitly.
+template I<int>::I(const I<int> &);
+
int
main ()
{
Seems that OpenMP has to call mark_used or some such.
