[Bug c/60100] warning disappears when preprocessed source is compiled

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60100

--- Comment #7 from Andreas Schwab <schwab@linux-m68k.org> ---
# 3416 "/home/lavr/cxx/src/connect/ncbi_socket.c" 3 4

The file is marked as system header, perhaps because the expansion on this line
came from a system header?  (looks like assert(...))  Note that there are
several occurences of # 3416, some as system headers, some not, but it's the
last one that matters for line 3447.