C ++错误：'inline'只能出现在函数上 [英] C++ error: 'inline' can only appear on functions

问题描述

我想使用clang ++在OS X 10.7下编译 VCMI 。

我配置项目与 CXX = clang ++ 因为苹果的gcc似乎不认识所需 -std =

我添加了 -stdlib = libc ++ CXXFLAGS 因为没有那个clang甚至不能找到 #include< array> 。

目前我有： CXXFLAGS = -std = c ++ 0x -stdlib = libc ++ -Wall -Wextra -Wcast-align -Wpointer -arith -Wno-switch -Wno-sign-compare -Wno-unused-parameter -Wc ++ 11-extensions

我收到以下错误：

  clang：warning：将'c-header'输入为'c ++  - 模式，此行为已过时
 clang：warning：参数在编译期间未使用：'-ggdb'
 StdInc.h：1：9：warning：#pragma once in main file 
 #pragma once 
 ^ 
在从StdInc.h中包含的文件中：3：
从./../Global.h:32：
中包含的文件在/ usr / bin中包含的文件/../lib/c++/v1/algorithm:594：
在/usr/bin/../lib/c++/v1/memory:596：
 / usr / bin /中包含的文件中。 ./lib/c++/v1/iterator:1696:1：错误：'inline'只能出现在函数
 inline _LIBCPP_INLINE_VISIBILITY 
 ^ 
 /usr/bin/../lib/c++ / v1 / iterator：1698：1：error：变量'begin'声明为模板
 begin（_T（& __ array）[_ N]）
 ^ 
 / usr / bin /。 ./lib/c++/v1/iterator:1698:12：error：使用未声明的标识符'__array'
 begin（_T（& __ array）[_ N]）
 ^ 
 ./ ../tchar_amigaos4.h:157:16：note：从宏'_T'扩展
 #define _T（x）x 
 ^ 
在从StdInc.h中包含的文件中：3：
在./../Global.h:32中包含的文件中：
在/usr/bin/../lib/c++/v1/algorithm:594中包含的文件中：
在文件中包括从/usr/bin/../lib/c++/v1/memory:596：
 /usr/bin/../lib/c++/v1/iterator:1698:25：error：expected';'在结束声明
 begin（_T（& __ array）[_ N]）
 ^ 
; 
 /usr/bin/../lib/c++/v1/iterator:1699:1：error：expected unqualified-id 
 {
 ^ 
 1个警告和5个错误。 
  

我必须承认，我从来没有见过这样的事情。这些都在libc ++源代码！

解决方案

您的问题在这里：

  ./../ tchar_amigaos4.h：157：16：注意：从宏_T扩展
 #define _T（x）x 
  

在代码中定义一个名为_T的宏，然后包含标准头，这是一个未定义的行为，严格来说。 / p>

IIRC，libc ++的较新版本避免使用名称_T，特别是因为人们倾向于使用这个名称，因此您可能想尝试升级到最新版本的命令行工具。

I'm trying to compile VCMI under OS X 10.7 using clang++.

I configured project with CXX=clang++ because Apple's gcc didn't seem to recognize required -std=c++0x flag.

I've added -stdlib=libc++ to CXXFLAGS because without that clang wasn't even able to find #include <array>.

Currently i've got: CXXFLAGS= -std=c++0x -stdlib=libc++ -Wall -Wextra -Wcast-align -Wpointer-arith -Wno-switch -Wno-sign-compare -Wno-unused-parameter -Wc++11-extensions

The problem is that I get following errors:

clang: warning: treating 'c-header' input as 'c++-header' when in C++ mode, this behavior    is deprecated
clang: warning: argument unused during compilation: '-ggdb'
StdInc.h:1:9: warning: #pragma once in main file
#pragma once
        ^
In file included from StdInc.h:3:
In file included from ./../Global.h:32:
In file included from /usr/bin/../lib/c++/v1/algorithm:594:
In file included from /usr/bin/../lib/c++/v1/memory:596:
/usr/bin/../lib/c++/v1/iterator:1696:1: error: 'inline' can only appear on functions
inline _LIBCPP_INLINE_VISIBILITY
^
/usr/bin/../lib/c++/v1/iterator:1698:1: error: variable 'begin' declared as a template
begin(_T (&__array)[_N])
^
/usr/bin/../lib/c++/v1/iterator:1698:12: error: use of undeclared identifier '__array'
begin(_T (&__array)[_N])
           ^
./../tchar_amigaos4.h:157:16: note: expanded from macro '_T'
#define _T(x)           x
                        ^
In file included from StdInc.h:3:
In file included from ./../Global.h:32:
In file included from /usr/bin/../lib/c++/v1/algorithm:594:
In file included from /usr/bin/../lib/c++/v1/memory:596:
/usr/bin/../lib/c++/v1/iterator:1698:25: error: expected ';' at end of declaration
begin(_T (&__array)[_N])
                        ^
                        ;
/usr/bin/../lib/c++/v1/iterator:1699:1: error: expected unqualified-id
{
^
1 warning and 5 errors generated.

I must admit that I've never saw anything like this. These are in libc++ sources! Does anybody know what may be the cause?

解决方案

Your issue is here:

./../tchar_amigaos4.h:157:16: note: expanded from macro '_T'
#define _T(x)           x

Defining a macro named _T in your code, then including standard headers, is undefined behavior, strictly speaking.

IIRC, newer versions of libc++ avoid the use of the name _T in particular because people tend to screw this up, so you might want to try upgrading to the newest version of the command-line tools.

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