[Bug c++/83936] [feature request] Allow constexpr char* as target argument

[roland at rschulz dot eu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83936

--- Comment #2 from Roland Schulz <roland at rschulz dot eu> ---
Do you mean for the target attribute or for all attributes in general? The
following example suggests that for the alloc_align attribute it works to have
the argument depend on a template argument.

template<int xx>
[[gnu::alloc_align(xx)]]
void *a(int align);

void test(int align)
{
    a<1>(align);
    a<2>(align);
}

$ g++ test_attr.cc -Wall -Wextra -c
test_attr.cc: In substitution of 'template<int xx> void* a(int) [with int xx =
2]':
test_attr.cc:8:15:   required from here
test_attr.cc:3:7: warning: alloc_align parameter outside range [-Wattributes]
 void *a(int align);