[Bug c/96420] -Wsign-extensions warnings are generated from system header macros

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96420

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amonakov at gcc dot gnu.org

--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Minimized standalone testcase:

# 1 "foo.c" 1
# 1 "foo.h" 1
# 1 "foo.h" 3
#define C(x) (0u+(x))
# 2 "foo.c" 2

unsigned f(int x)
{
    return C(x);
}