[Bug c++/58855] Attributes ignored on type alias in template

[gcc at ebasoft dot com.pl via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58855

gcc at ebasoft dot com.pl changed:

   What|Removed |Added

 CC||gcc at ebasoft dot com.pl

--- Comment #3 from gcc at ebasoft dot com.pl ---
This bug is still present in gcc version 11.2.1 20220115

namespace concepts
{
 template
 concept arithmetic = std::integral || std::floating_point;
}
template
using point_vector = T __attribute__((__vector_size__(sizeof(T)*2)));

warning: ignoring attributes applied to dependent type ‘T’ without an
associated declaration [-Wattributes]
   70 | using point_vector = T
__attribute__((__vector_size__(sizeof(T)*2)));
  |   
^

[Bug c++/58855] Attributes ignored on type alias in template

[ncm at cantrip dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58855

--- Comment #2 from ncm at cantrip dot org ---
This bug is still present in g++-10.2

[Bug c++/58855] Attributes ignored on type alias in template

[ncm at cantrip dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58855

ncm at cantrip dot org changed:

   What|Removed |Added

 CC||ncm at cantrip dot org

--- Comment #1 from ncm at cantrip dot org ---
This bug is still present in g++-5.3.1:

$ cat usingbug.cc

template 
struct S {
  typedefunsigned  __attribute__((vector_size(N*sizeof(unsigned T1;
  using T2 = unsigned  __attribute__((vector_size(N*sizeof(unsigned;
};

int main()
{
S<4u>::T1 v1;
S<4u>::T2 v2;

return v1[1] + v2[2];
}

$ g++ -std=c++14 usingbug.cc 
usingbug.cc: In function ‘int main()’:
usingbug.cc:13:24: error: invalid types ‘S<4u>::T2 {aka unsigned int}[int]’ for
array subscript
 return v1[1] + v2[2];
^
$ g++ --version
g++ (Debian 5.3.1-4) 5.3.1 20151219