xcode MEX 编译错误：未知类型名称“char16_t”

MEX compile error: unknown type name 'char16_t'

提问by p0lAris

I cannot compile any MATLAB MEX code due to the following error:

由于以下错误，我无法编译任何 MATLAB MEX 代码：

In file included from /Applications/MATLAB_R2013a.app/extern/include/mex.h:58:
In file included from /Applications/MATLAB_R2013a.app/extern/include/matrix.h:294:
/Applications/MATLAB_R2013a.app/extern/include/tmwtypes.h:819:9: error: unknown type name 'char16_t'
typedef char16_t CHAR16_T;

The only thing that has changed on my machine as far as I can remember is that Xcode was updated to version 5.1 (5B130a).

据我所知，我的机器上唯一改变的是 Xcode 更新到了 5.1 (5B130a) 版。

Any fix for the time being to compile MEX code in MATLAB?

暂时在 MATLAB 中编译 MEX 代码有什么解决方法吗？

[Running on OS 10.9.2 with Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)]

[在 OS 10.9.2 和 Apple LLVM 版本 5.1 (clang-503.0.38) 上运行（基于 LLVM 3.4svn）]

采纳答案by chappjc

By default, the upgraded Clang doesn't set char16_t, which is required by MATLAB.

默认情况下，升级后的 Clang 不会设置char16_t，这是 MATLAB 所要求的。

Quick fix

快速解决

This works for C or C++ code but needs to be done on each mexcommand line.

这适用于 C 或 C++ 代码，但需要在每个mex命令行上完成。

>> mex -Dchar16_t=uint16_t ...

Other solutions below put this definition into the mex configuration or enable C++11.

下面的其他解决方案将此定义放入 mex 配置或启用 C++11。

Permanent solution

永久解决方案

Options:

选项：

• Add -std=c++11to CXXFLAGSin your mex configuration file AND compile .cpp files instead of .c. The mex config file is mexopts.sh (pre-R2014a) or the .xml file indicated by mex -setup(R2014a+). This is what worked for OP, but the next option works too.Be sure to edit the active/installed config, not the system-wide reference. Try the next solution if you can't tell.
• Use a #defineor typedefto create char16_tbefore including mex.h (see "other workaround" below).
• In some future version of MATLAB, this will have been fixed. Re-run mex -setupto have MATLAB reconfigure it for you and it works. As of R2014a, this doesn't do the trick.
• As a last resort, you can always modify the MATLAB installation, hacking MATLAB's tmwtypes.h as Dennis suggests, but I strongly suggest NOTmodifying the MATLAB installation.

• 添加-std=c++11到CXXFLAGS您的 mex 配置文件并编译 .cpp 文件而不是 .c。mex 配置文件是 mexopts.sh（R2014a 之前的版本）或由mex -setup(R2014a+)指示的 .xml 文件。 这对 OP 有效，但下一个选项也有效。请务必编辑活动/已安装的配置，而不是系统范围的参考。如果您不知道，请尝试下一个解决方案。
• 在包含 mex.h 之前使用#define或typedef创建char16_t（请参阅下面的“其他解决方法”）。
• 在某些未来版本的 MATLAB 中，这将得到修复。重新运行mex -setup以让 MATLAB 为您重新配置它并且它可以工作。从 R2014a 开始，这不起作用。
• 作为最后的手段，您可以随时修改 MATLAB 安装，按照 Dennis 的建议修改 MATLAB 的 tmwtypes.h，但我强烈建议不要修改 MATLAB 安装。

Note: If you are using C and cannot or don't want to change to C++, follow the solution in this other answer, OR see the alternative workaround below.

注意：如果您使用的是 C 并且不能或不想更改为 C++，请按照此其他答案中的解决方案进行操作，或查看下面的替代解决方法。

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The other workaround

另一种解决方法

If for some reason you are not able to enable the C++11 standard, you can use the preprocessor to define char16_t. Either put #define char16_t uint16_tbefore#include "mex.h", or set it with the compiler command line:

如果由于某种原因您无法启用 C++11 标准，您可以使用预处理器定义char16_t. 要么放在#define char16_t uint16_tbefore#include "mex.h"，要么用编译器命令行设置它：

-Dchar16_t=uint16_t

Alternatively, use a typedef, again beforeincluding mex.h:

或者，在包含 mex.h之前typedef再次使用, ：

typedef uint16_t char16_t;

If these solutions don't work, try changing uint16_tto UINT16_T. Further yet, others have reported that simply including uchar.h brings in the type, but others don't have that header.

如果这些解决方案不起作用，请尝试更改uint16_t为UINT16_T. 此外，其他人报告说，简单地包含 uchar.h 会引入类型，但其他人没有该标题。

回答by Dennis

I experienced the same error, also directly after upgrading to Xcode 5.1.

我也直接在升级到 Xcode 5.1 后遇到了同样的错误。

The relevant lines (818-824) in the file tmwtypes.h, which causes the error, are:

导致错误的文件 tmwtypes.h 中的相关行 (818-824) 是：

#if defined(__STDC_UTF_16__) || (defined(_HAS_CHAR16_T_LANGUAGE_SUPPORT) && _HAS_CHAR16_T_LANGUAGE_SUPPORT)
typedef char16_t CHAR16_T;
#elif defined(_MSC_VER)
typedef wchar_t CHAR16_T;
#else
typedef UINT16_T CHAR16_T;
#endif

A solution is to simply change the line

一个解决方案是简单地改变行

typedef char16_t CHAR16_T;

into

进入

typedef UINT16_T CHAR16_T;

A must admit that I don't know if this affects any function or behaviour of mex files but at least I'm able to compile my c files again using mex.

必须承认，我不知道这是否会影响 mex 文件的任何功能或行为，但至少我能够使用 mex 再次编译我的 c 文件。

回答by p0lAris

Please see other answers if this method doesn't work.

如果此方法不起作用，请参阅其他答案。

I upgraded my gcc/g++ compilers using homebrew to version 4.8 --> gcc-4.8and g++-4.8.

我使用自制软件将我的 gcc/g++ 编译器升级到 4.8 -->gcc-4.8和g++-4.8.

After that I changed the following lines in the mexopts.sh file:

之后，我更改了 mexopts.sh 文件中的以下几行：

CXXFLAGS="-fno-common -fexceptions -arch $ARCHS -isysroot $MW_SDKROOT -mmacosx-version-min=$MACOSX_DEPLOYMENT_TARGET -std=c++11"

In my mexopts.sh, this is line 150. I only added the -std=c++11flag which is what I guess chappjc meant.

在我的 mexopts.sh 中，这是第 150 行。我只添加了-std=c++11我猜是 chappjc 的意思的标志。

EDIT: This is covered in the update by chappjc!

编辑：chappjc 的更新涵盖了这一点！

回答by Raffi

I just add my own experiment (C++ only). The

我只是添加了我自己的实验（仅限 C++）。这

#define char16_t uint16_t 

was causing some problem in the other parts of the mex file. In fact, subsequently to my mex file, char16_twas properly defined. By tracking the chain of includes, the proper type char16_tis set in a file named __config:

在 mex 文件的其他部分引起了一些问题。事实上，随后我的 mex 文件，char16_t被正确定义。通过跟踪包含链，char16_t在名为 的文件中设置了正确的类型__config：

typedef __char16_t char16_t;

which is also the first file included from <algorithm>. So the hack consists in including algorithmbefore mex.h.

这也是从<algorithm>. 所以黑客在于包括algorithmbefore mex.h。

#include <algorithm>
#include "mex.h"

and the proper settings are performed, still in a multiplatform manner and without changing anything in the build configuration.

并执行正确的设置，仍然以多平台方式进行，并且不会更改构建配置中的任何内容。

回答by Navid

As part of XCode 5.1.1 char16_tis defined in __config, which is called from typeinfo.

作为 XCode 5.1.1 的一部分，char16_t在 中定义__config，从typeinfo.

You can add

你可以加

#include <typeinfo> 

before

前

#include "mex.h"

to have char16_tdefined.

已经char16_t定义。

回答by Palli Kominak

This post might help: http://www.seaandsailor.com/matlab-xcode6.html

这篇文章可能会有所帮助：http: //www.seaandsailor.com/matlab-xcode6.html

It was easier than I thought. Just replace all 10.x with your OS X version and add -Dchar16_t=UINT16_Tto CLIBSin mexopts.shfile.

这比我想象的要容易。只需用OS X的版本替换所有10.x和添加-Dchar16_t=UINT16_T到CLIBS在mexopts.sh文件中。

It worked on OS X 10.9 Mavericks with Xcode 6 installed.

它适用于安装了 Xcode 6 的 OS X 10.9 Mavericks。

回答by tesch1

Include uchar.h before including mex.h...works fine. Also, the answer above (adding -std=c++11) only works for c++, not c.

在包含 mex.h 之前包含 uchar.h ......工作正常。此外，上面的答案（添加 -std=c++11）仅适用于 c++，不适用于 c。

#include <uchar.h>
#include "mex.h"