Without looking through every single source file in my XCode project, is there a way to find out which #include is triggering the following warning?
#warning This file includes at least one deprecated or antiquated header.
Please consider using one of the 32 headers found in section 17.4.1.2 of the
C++ standard. Examples include substituting the <X> header for the <X.h>
header for C++ includes, or <iostream> instead of the deprecated header
<iostream.h>. To disable this warning use -Wno-deprecated.
Clicking on the error in XCode just opens the backward_warning.h file, which is totally useless.
I know what the warning means, I know how to fix it (when I see the file in question and can look at its #includes)... but I just don't know how to find the file causing the error!
Use the -H option to GCC - that will list the header files that are being included (along with a nesting indication so you can see what file is including which header).
With -H the error will be placed in the output stream clearly showing how the compiler got to backward_warning.h.
For example, when I include hash_map, I'd see:
mikeb@ubuntu:~$ g++ -H -c test.cpp
. /usr/include/c++/4.4/backward/hash_map
.. /usr/include/c++/4.4/backward/backward_warning.h
In file included from /usr/include/c++/4.4/backward/hash_map:60,
from test.cpp:3:
/usr/include/c++/4.4/backward/backward_warning.h:28: warning: #warning This file
includes at least one deprecated or antiquated header which may be removed without
further notice at a future date. Please use a non-deprecated interface with equivalent
functionality instead. For a listing of replacement headers and interfaces, consult
the file backward_warning.h. To disable this warning use -Wno-deprecated.
... a bunch of snipped output ...
As an aside, /showIncludes performs the same function in MSVC.
As you stated, the file /usr/include/c++/4.2.1/backward/backward_warning.h
contains the text you quote. The headers which include backward_warning.h are:
/usr/include/c++/4.2.1/backward/algo.h/usr/include/c++/4.2.1/backward/algobase.h/usr/include/c++/4.2.1/backward/alloc.h/usr/include/c++/4.2.1/backward/bvector.h/usr/include/c++/4.2.1/backward/complex.h/usr/include/c++/4.2.1/backward/defalloc.h/usr/include/c++/4.2.1/backward/deque.h/usr/include/c++/4.2.1/backward/fstream.h/usr/include/c++/4.2.1/backward/function.h/usr/include/c++/4.2.1/backward/hash_map.h/usr/include/c++/4.2.1/backward/hash_set.h/usr/include/c++/4.2.1/backward/hashtable.h/usr/include/c++/4.2.1/backward/heap.h/usr/include/c++/4.2.1/backward/iomanip.h/usr/include/c++/4.2.1/backward/iostream.h/usr/include/c++/4.2.1/backward/istream.h/usr/include/c++/4.2.1/backward/iterator.h/usr/include/c++/4.2.1/backward/list.h/usr/include/c++/4.2.1/backward/map.h/usr/include/c++/4.2.1/backward/multimap.h/usr/include/c++/4.2.1/backward/multiset.h/usr/include/c++/4.2.1/backward/new.h/usr/include/c++/4.2.1/backward/ostream.h/usr/include/c++/4.2.1/backward/pair.h/usr/include/c++/4.2.1/backward/queue.h/usr/include/c++/4.2.1/backward/rope.h/usr/include/c++/4.2.1/backward/set.h/usr/include/c++/4.2.1/backward/slist.h/usr/include/c++/4.2.1/backward/stack.h/usr/include/c++/4.2.1/backward/stream.h/usr/include/c++/4.2.1/backward/streambuf.h/usr/include/c++/4.2.1/backward/strstream/usr/include/c++/4.2.1/backward/tempbuf.h/usr/include/c++/4.2.1/backward/tree.h/usr/include/c++/4.2.1/backward/vector.h
Therefore, the code you are compiling must be including a header such as:
#include <vector.h>
instead of the preferred:
#include <vector>
And the compiler is getting fussy about it. The fix is to find the code which includes the pre-standard header and update it to use the standard header.
(You get similar warnings about deprecated functions if you compile git - the functions are the SHA1 functions from OpenSSL. It is a nuisance, to be polite about it.)
You have an old style header somewhere.
something like this
IE:
#include <iostream.h> //instead of <iostream>
#include <stdlib.h> //instead of <cstdlib>
#include <stdio.h> //instead of <cstdio>
if it is included from a library then I think you are SOL, I personally wouldn't rummage through a library to get it to work you will have to up date them to use namespaces. and other such.
来源：https://stackoverflow.com/questions/8280320/where-is-this-backward-warning-h-warning-coming-from