[Bug libgomp/120682] declare mapper does not work with templates

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120682

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Declare mapper support has been added to GCC for C++ only in GCC 16, with
r16-983-g48973e8783e59462ab6e34d5d48b74a2146a05f1
And your testcase is invalid and correctly rejected by trunk:
pr120682.C:8:34: error: ‘T’ was not declared in this scope
    8 | #pragma omp declare mapper(myvec<T> v) map(v, v.data[0:v.len])
      |                                  ^
pr120682.C:8:35: error: template argument 1 is invalid
    8 | #pragma omp declare mapper(myvec<T> v) map(v, v.data[0:v.len])
      |                                   ^