xcode 这个backward_warning.h #warning 来自哪里？
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Where is this backward_warning.h #warning coming from?
提问by Piku
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?
无需查看我的 XCode 项目中的每个源文件，有没有办法找出哪个 #include 触发了以下警告？
#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.
点击XCode中的错误只是打开了backward_warning.h文件，完全没用。
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!
我知道警告的含义，我知道如何修复它（当我看到有问题的文件并可以查看它的 #includes 时）......但我只是不知道如何找到导致错误的文件！
回答by Michael Burr
Use the -Hoption 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).
使用-HGCC 选项 - 这将列出包含的头文件（连同嵌套指示，以便您可以查看包含哪个头的文件）。
With -Hthe error will be placed in the output stream clearly showing how the compiler got to backward_warning.h.
随着-H该错误将被放置在输出流中清楚地显示出编译器如何到达backward_warning.h。
For example, when I include hash_map, I'd see:
例如，当我包含时hash_map，我会看到：
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, /showIncludesperforms the same function in MSVC.
/showIncludes顺便说一句，在 MSVC 中执行相同的功能。
回答by Jonathan Leffler
As you stated, the file /usr/include/c++/4.2.1/backward/backward_warning.hcontains the text you quote. The headers which include backward_warning.hare:
正如您所说，该文件/usr/include/c++/4.2.1/backward/backward_warning.h包含您引用的文本。包括的标题backward_warning.h是：
/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
/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:
因此，您正在编译的代码必须包含一个标头，例如：
#include <vector.h>
instead of the preferred:
而不是首选：
#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.
编译器对此越来越挑剔。修复方法是找到包含预标准标头的代码并将其更新为使用标准标头。
(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.)
（如果您编译，您会收到关于不推荐使用的函数的类似警告git- 这些函数是来自 OpenSSL 的 SHA1 函数。这是一个令人讨厌的问题，礼貌地说。）
回答by 111111
You have an old style header somewhere.
您在某处有一个旧样式的标题。
something like this
像这样的东西
IE:
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.
如果它是从库中包含的，那么我认为您是 SOL，我个人不会翻阅库以使其正常工作，您将不得不更新它们以使用名称空间。和其他这样的。
