diff options
| author | Patrick Palka <ppalka@redhat.com> | 2020-12-11 09:40:58 -0500 |
|---|---|---|
| committer | Patrick Palka <ppalka@redhat.com> | 2020-12-11 09:40:58 -0500 |
| commit | 958d42abdf1a1936d290aab126cebd6bb4a52361 (patch) | |
| tree | cce0f5e412579a4dcdf3778c775735273c48da00 | |
| parent | 33314b11ca2ef1bacc1f5d82c58fae23a1d818ef (diff) | |
| download | gcc-958d42abdf1a1936d290aab126cebd6bb4a52361.zip gcc-958d42abdf1a1936d290aab126cebd6bb4a52361.tar.gz gcc-958d42abdf1a1936d290aab126cebd6bb4a52361.tar.bz2 | |
c++: missing SFINAE with pointer subtraction [PR78173]
This fixes a missed SFINAE when subtracting pointers to an incomplete
type.
gcc/cp/ChangeLog:
PR c++/78173
* typeck.c (pointer_diff): Use complete_type_or_maybe_complain
instead of complete_type_or_else.
gcc/testsuite/ChangeLog:
PR c++/78173
* g++.dg/cpp2a/concepts-pr78173.C: New test.
| -rw-r--r-- | gcc/cp/typeck.c | 2 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/cpp2a/concepts-pr78173.C | 9 |
2 files changed, 10 insertions, 1 deletions
diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c index afbb8ef..a650581 100644 --- a/gcc/cp/typeck.c +++ b/gcc/cp/typeck.c @@ -5984,7 +5984,7 @@ pointer_diff (location_t loc, tree op0, tree op1, tree ptrtype, tree restype = ptrdiff_type_node; tree target_type = TREE_TYPE (ptrtype); - if (!complete_type_or_else (target_type, NULL_TREE)) + if (!complete_type_or_maybe_complain (target_type, NULL_TREE, complain)) return error_mark_node; if (VOID_TYPE_P (target_type)) diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-pr78173.C b/gcc/testsuite/g++.dg/cpp2a/concepts-pr78173.C new file mode 100644 index 0000000..50f561a --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp2a/concepts-pr78173.C @@ -0,0 +1,9 @@ +// PR c++/78173 +// { dg-do compile { target c++20 } } + +template <class T> +concept CanDifference = requires(T x, T y) { + x - y; +}; + +static_assert(!CanDifference<void*>); |