Hi! Following patch adds support for this warning http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20120618/059295.html
Please, review.

Ping?

This was (re)implemented in r222568.

int main(void)
{
const char *x = 0;
char *y = (char *)x;
return 0;
}

gcc -Wcast-qual warns:

test.c:4: warning: cast discards qualifiers from pointer target type

clang warns nothing.

clang-4.0 still does not warn on that.
https://godbolt.org/g/3SEdPm

Upon further research, it seems that clang's -Wcast-qual does work for C, but unlike gcc's -Wcast-qual, does not do anything in C++.

Opened https://reviews.llvm.org/D33102
Do not know who to add as reviewers there.

D33102 has just re-landed.