c++: constinit on pointer to function [PR104066]
[dcl.constinit]: "The constinit specifier shall be applied only to
a declaration of a variable with static or thread storage duration."
Thus, this ought to be OK:
constinit void (*p)() = nullptr;
but the error message I introduced when implementing constinit was
not looking at funcdecl_p, so the code above was rejected.
Fixed thus. I'm checking constinit_p first because I think that's
far more likely to be false than funcdecl_p.
PR c++/104066
gcc/cp/ChangeLog:
* decl.cc (grokdeclarator): Check funcdecl_p before complaining
about constinit.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/constinit18.C: New test.
diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index d28889e..9a7b1a6 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -13071,7 +13071,7 @@
"an array", name);
return error_mark_node;
}
- if (constinit_p)
+ if (constinit_p && funcdecl_p)
{
error_at (declspecs->locations[ds_constinit],
"%<constinit%> on function return type is not "
diff --git a/gcc/testsuite/g++.dg/cpp2a/constinit18.C b/gcc/testsuite/g++.dg/cpp2a/constinit18.C
new file mode 100644
index 0000000..51b4f02
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/constinit18.C
@@ -0,0 +1,12 @@
+// PR c++/104066
+// { dg-do compile { target c++20 } }
+
+constinit void (*p)() = nullptr;
+constinit void (*pp)() = nullptr;
+void fn();
+constinit void (&r)() = fn;
+
+extern constinit long (* const syscall_reexported) (long, ...);
+
+constinit void bad (); // { dg-error ".constinit. on function return type is not allowed" }
+constinit void bad () { } // { dg-error ".constinit. on function return type is not allowed" }
