mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-03-19 05:10:25 +08:00
Code Issues Packages Projects Releases Wiki Activity

c++: decltype of invalid non-dependent expr [PR57943]

Browse Source 
We sometimes fail to reject an invalid non-dependent operand to decltype
when inside a template, because finish_decltype_type resolves the
decltype to the TREE_TYPE of the operand before we ever instantiate and
fully process the operand.  Fix this by adding a call to
instantiate_non_dependent_expr_sfinae in finish_decltype_type.

gcc/cp/ChangeLog:

	PR c++/57943
	* semantics.c (finish_decltype_type): Call
	instantiate_non_dependent_expr_sfinae on the expression.

gcc/testsuite/ChangeLog:

	PR c++/57943
	* g++.dg/cpp0x/decltype76.C: New test.
This commit is contained in:
Patrick Palka 2020-05-15 18:51:11 -04:00
parent 9d495e7250
commit 115232b778
4 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
gcc/cp/ChangeLog
View File

@ -1,3 +1,9 @@
2020-05-16 Patrick Palka <ppalka@redhat.com>
PR c++/57943
* semantics.c (finish_decltype_type): Call
instantiate_non_dependent_expr_sfinae on the expression.
2020-05-15 Patrick Palka <ppalka@redhat.com>
Revert:

8
gcc/cp/semantics.c
View File

@ -9746,6 +9746,14 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
return type;
}
else if (processing_template_decl)
{
++cp_unevaluated_operand;
expr = instantiate_non_dependent_expr_sfinae (expr, complain);
--cp_unevaluated_operand;
if (expr == error_mark_node)
return error_mark_node;
}
/* The type denoted by decltype(e) is defined as follows: */

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2020-05-16 Patrick Palka <ppalka@redhat.com>
PR c++/57943
* g++.dg/cpp0x/decltype76.C: New test.
2020-05-15 Jason Merrill <jason@redhat.com>
* g++.dg/coroutines/coro.h: Always #include <utility>.

7
gcc/testsuite/g++.dg/cpp0x/decltype76.C Normal file
View File

@ -0,0 +1,7 @@
// PR c+/57943
// { dg-do compile { target c++11 } }
struct a { };
template <typename T = decltype (a(0))> // { dg-error "" }
void f() { }