如何修复MacOSX上缺少时间相关的全局命名空间中没有成员的错误？

Question

我正在尝试在Maverick10.9的命令行上编译一个项目。该项目可以在Linux上完美地编译。显然，MacOSX上的ctime似乎有一个问题。错误是

$ make
Compiling src//core/AbstractARAClient.cpp
In file included from src//core/AbstractARAClient.cpp:5:
In file included from include/AbstractARAClient.h:8:
In file included from include/ARAMacros.h:14:
In file included from include/Address.h:9:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/sstream:174:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ostream:131:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ios:216:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__locale:18:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/mutex:176:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__mutex_base:15:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/chrono:279:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ctime:56:9: error: no member named
      'clock_t' in the global namespace
using ::clock_t;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ctime:58:9: error: no member named
      'time_t' in the global namespace; did you mean 'size_t'?
using ::time_t;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.0/include/stddef.h:42:23: note: 
      'size_t' declared here
typedef __SIZE_TYPE__ size_t;

In file included from src//core/AbstractARAClient.cpp:5:
In file included from include/AbstractARAClient.h:8:
In file included from include/ARAMacros.h:14:
In file included from include/Address.h:9:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/sstream:174:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ostream:131:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ios:216:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__locale:18:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/mutex:176:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__mutex_base:15:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/chrono:279:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ctime:60:9: error: no member named
      'clock' in the global namespace
using ::clock;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ctime:61:9: error: no member named
      'difftime' in the global namespace
using ::difftime;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ctime:62:9: error: no member named
      'mktime' in the global namespace
using ::mktime;
      ~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ctime:63:9: error: no member named
      'time' in the global namespace
using ::time;

我在网上搜索过，如果项目中有名为“time.h”的头文件，似乎会出现问题(就像这个项目中的情况一样)。ctime的实际不完整实现似乎也存在问题(但通常人们通过xcode安装命令行实用程序)。

我想知道一般的问题是什么，最后是如何在mac上实际编译代码。相反，对于存储库中的代码，我已经在Makefile的第53行添加了一个stdlib选项

CFLAGS_DEBUG = -g -Wall -stdlib=libc++

在Makefile的前一行中已经设置了C++11选项。

提亚

Answer 1

答案或多或少是显而易见的。该项目包含一个头Time.h (和相应的类Time)。不幸的是，MacOSX文件系统不区分大小写，这意味着这与/usr/include中现有的time.h冲突。

您可以在Time.h之前包含系统time.h (意思是#include <ctime>)，也可以简单地将您的文件重命名为其他名称(例如MyTime.h)。

Answer 2

检查系统上是否存在/usr/local/include/time.h，如果存在则将其删除。

Answer 3

有一种不同的方法来解决这个问题，哪个IMHO更好。我写这篇文章是为了下次遇到这个错误时，我可以很容易地找到答案，并且忘记了解决方案(在几年内？)

进入Xcode并从构建阶段中删除"Headers“部分中包含的项目文件。

这将防止编译器的不当操作，包括从您的空间(应该只(或至少最后排序)可通过“Time.h”访问)

这实际上告诉Xcode“不，我不想像搜索库一样搜索我自己的头文件，因为它是我自己的项目”

它可能还有其他次要影响，但至少对我的用途来说，这比重命名我的"Time.h“要好。