On Sun, Apr 14, 2024 at 01:40:18AM +1000, Nathaniel Shead wrote:
> On Fri, Apr 12, 2024 at 01:50:47PM -0400, Jason Merrill wrote:
> > On 4/11/24 20:40, Nathaniel Shead wrote:
> > > Bootstrapped and regtested on x86_64-pc-linux-gnu, OK for trunk?
> > >
> > > -- >8 --
> > >
> > > The modules code currently neglects to set OVL_USING_P on the dependency
> > > created for a using-decl, which causes it not to remember that the
> > > OVL_EXPORT_P flag had been set on it when emitted from the primary
> > > interface unit. This patch ensures that it occurs.
> > >
> > > gcc/cp/ChangeLog:
> > >
> > > * module.cc (depset::hash::add_binding_entity): Propagate
> > > OVL_USING_P for using-declarations.
> > >
> > > gcc/testsuite/ChangeLog:
> > >
> > > * g++.dg/modules/using-15_a.C: New test.
> > > * g++.dg/modules/using-15_b.C: New test.
> > > * g++.dg/modules/using-15_c.C: New test.
> > >
> > > Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com>
> > > ---
> > > gcc/cp/module.cc | 4 ++++
> > > gcc/testsuite/g++.dg/modules/using-15_a.C | 13 +++++++++++++
> > > gcc/testsuite/g++.dg/modules/using-15_b.C | 5 +++++
> > > gcc/testsuite/g++.dg/modules/using-15_c.C | 7 +++++++
> > > 4 files changed, 29 insertions(+)
> > > create mode 100644 gcc/testsuite/g++.dg/modules/using-15_a.C
> > > create mode 100644 gcc/testsuite/g++.dg/modules/using-15_b.C
> > > create mode 100644 gcc/testsuite/g++.dg/modules/using-15_c.C
> > >
> > > diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
> > > index 9d054c4c792..527c9046c67 100644
> > > --- a/gcc/cp/module.cc
> > > +++ b/gcc/cp/module.cc
> > > @@ -12915,10 +12915,12 @@ depset::hash::add_binding_entity (tree decl,
> > > WMB_Flags flags, void *data_)
> > > /* Ignore NTTP objects. */
> > > return false;
> > > + bool unscoped_enum_const_p = false;
> > > if (!(flags & WMB_Using) && CP_DECL_CONTEXT (decl) != data->ns)
> > > {
> > > /* A using that lost its wrapper or an unscoped enum
> > > constant. */
> > > + unscoped_enum_const_p = (TREE_CODE (decl) == CONST_DECL);
> >
> > How does this interact with C++20 using enum?
>
> Looks like it ignores those (so they still suffer from this error). But
> in general we don't handle usings of non-functions correctly anyway yet
> (for the reasons I described in the cover letter); I just added this for
> now to prevent regressing some test-cases caused by importing enum
> consts wrapped in an OVERLOAD.
>
> Otherwise happy to defer this patch until GCC 15 when I can look at
> exploring what needs to be done to handle non-function using-decls
> correctly, but I'll need to work out a new testcase for the followup
> patch in this series (or just defer that one too, I suppose).
>
Ping. Or should I just scrap this patch for now, find a new testcase
for the followup patch, and submit it again once we have a general
solution for using-decls of non-functions?
> > > flags = WMB_Flags (flags | WMB_Using);
> > > if (DECL_MODULE_EXPORT_P (TREE_CODE (decl) == CONST_DECL
> > > ? TYPE_NAME (TREE_TYPE (decl))
> > > @@ -12979,6 +12981,8 @@ depset::hash::add_binding_entity (tree decl,
> > > WMB_Flags flags, void *data_)
> > > if (flags & WMB_Using)
> > > {
> > > decl = ovl_make (decl, NULL_TREE);
> > > + if (!unscoped_enum_const_p)
> > > + OVL_USING_P (decl) = true;
> > > if (flags & WMB_Export)
> > > OVL_EXPORT_P (decl) = true;
> > > }
> > > diff --git a/gcc/testsuite/g++.dg/modules/using-15_a.C
> > > b/gcc/testsuite/g++.dg/modules/using-15_a.C
> > > new file mode 100644
> > > index 00000000000..23895bd8c4a
> > > --- /dev/null
> > > +++ b/gcc/testsuite/g++.dg/modules/using-15_a.C
> > > @@ -0,0 +1,13 @@
> > > +// { dg-additional-options "-fmodules-ts -Wno-global-module" }
> > > +// { dg-module-cmi M:a }
> > > +
> > > +module;
> > > +namespace foo {
> > > + void a();
> > > +};
> > > +export module M:a;
> > > +
> > > +namespace bar {
> > > + // propagate usings from partitions
> > > + export using foo::a;
> > > +};
> > > diff --git a/gcc/testsuite/g++.dg/modules/using-15_b.C
> > > b/gcc/testsuite/g++.dg/modules/using-15_b.C
> > > new file mode 100644
> > > index 00000000000..a88f86af61f
> > > --- /dev/null
> > > +++ b/gcc/testsuite/g++.dg/modules/using-15_b.C
> > > @@ -0,0 +1,5 @@
> > > +// { dg-additional-options "-fmodules-ts" }
> > > +// { dg-module-cmi M }
> > > +
> > > +export module M;
> > > +export import :a;
> > > diff --git a/gcc/testsuite/g++.dg/modules/using-15_c.C
> > > b/gcc/testsuite/g++.dg/modules/using-15_c.C
> > > new file mode 100644
> > > index 00000000000..0651efffc91
> > > --- /dev/null
> > > +++ b/gcc/testsuite/g++.dg/modules/using-15_c.C
> > > @@ -0,0 +1,7 @@
> > > +// { dg-additional-options "-fmodules-ts" }
> > > +import M;
> > > +
> > > +int main() {
> > > + bar::a();
> > > + foo::a(); // { dg-error "not been declared" }
> > > +}
> >
