[Bug c/100670] unused attribute ignored on function definition

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100670

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Note btw that clang does not generate a warning:
...
$ clang -c -Wall -O0 -g -Werror foo.c -DTYPE="void *"
$ 
...
which means the attribute works, because if we remove the attribute we have
instead:
...
$ clang -c -Wall -O0 -g -Werror foo.c -DTYPE="void *"
foo.c:4:1: error: unused function 'foo' [-Werror,-Wunused-function]
foo (void)
^
1 error generated.
...