在Matlab mex文件中编译c ++ 11代码时出错 [英] Error when compiling c++11 code in a Matlab mex file

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问题描述

我已下载以下代码：


CVPR 2014交集优化代码



cvpr2014-iou- code-1.0.zip



http://research.microsoft.com/en-us/downloads/e164fe21-ef2b-4e34-98c1-4868968abb06/


我得到的是一个有两个文件夹的文件夹，一个名为 src / ，另一个名为 。我运行Linux Fedora 19，我可以编译代码在 src / 就好了。当我尝试编译 matlab / 中的代码时，会出现问题。



README说：


  Matlab编译
 ----------------- -  
在Matlab中，使用mex -setup配置编译器，然后在matlab\compile_windows.m或matlab / compile_linux.m脚本中调整
路径并运行
compile_linux .m或compile_windows.m。


更具体地针对Linux：


  Linux 
 ===== 
 
从Matlab运行mex -setup ，然后编辑mexopts.sh文件并修改
的设置
 
 CXXFLAGS =' -  std = c ++ 11 -fopenmp -march = native -D_GNU_SOURCE'
 CXXLIBS = $ RPATH $ MLIBS -lm -lgomp
 CXXOPTIMFLAGS =' -  Ofast -DNDEBUG'
 
这将启用OpenMP和C ++ 11，并且应该从G ++ 4.7开始工作。 
 
从matlab /目录，调用compile_linux来构建所有的mex文件。


所以我打开 matlab 并运行 mex -setup 。我回答是问题：

 > mex -setup 
 
选项文件控制使用哪个编译器，编译器和链接命令
选项以及要链接的运行时库。 
 
使用'mex -setup'命令选择
放在/user/wok/home/.matlab/R2012b中的选项文件，默认情况下用于'mex'。在当前工作目录中或在命令行
上指定的选项
文件覆盖/user/wok/home/.matlab/R2012b中的默认选项文件。 
 
要覆盖默认选项文件，请使用'mex -f'命令
（有关详细信息，请参阅'mex -help'）。 
 
 mex的选项文件是：
 
 1：/opt/matlab2012b/bin/mexopts.sh：
用于构建gcc MEX文件的模板选项文件
 
 
 0：不更改退出
 
输入编译器的编号（0-1）：
 1 
 
覆盖/user/wok/home/.matlab/R2012b/mexopts.sh（[y] / n）？ 
y 
 
 /opt/matlab2012b/bin/mexopts.sh正被复制到
 /user/wok/home/.matlab/R2012b/mexopts.sh 
 
 
 ******************************************* ******************************* 
警告：MATLAB C和Fortran API已更改为支持MATLAB 
变量具有超过2 ^ 32-1个元素。在不久的将来
你将需要更新你的代码，以利用新的
 API。您可以在以下位置找到更多信息：
 http://www.mathworks.com/help/techdoc/matlab_external/bsflnue-1.html 
使用-largeArrayDims选项构建启用新的API。 
 ********************************************** ****************************

然后我编辑文件 /user/wok/home/.matlab/R2012b/mexopts.sh ，我按照README中的说明： 


  CXX ='g ++'
 CXXFLAGS =' -  ansi -D_GNU_SOURCE'
 CXXFLAGS =$ CXXFLAGS -D_FILE_OFFSET_BITS = 64
 CXXFLAGS =$ CXXFLAGS -fPIC -pthread
 CXXLIBS =$ RPATH $ MLIBS -lm
 CXXOPTIMFLAGS =' -  O -DNDEBUG '
 CXXDEBUGFLAGS =' -  g'
  



  CXX ='g ++'
 CXXFLAGS =' -  std = c ++ 11 -fopenmp -march = native -D_GNU_SOURCE'
 CXXLIBS =$ RPATH $ MLIBS -lm -lgomp
 CXXOPTIMFLAGS =' -  Ofast -DNDEBUG'
 CXXDEBUGFLAGS =' -  g'


在此步骤后，我打开 matlab 并编辑 compile_linux.m 以将路径添加到Boost：

 ％你需要安装boost 1.49或更高版本（在
％的软件包中安装libboost-dev）
％
％在Ubuntu 13.10，Matlab R2012b，gcc 4.8.1 
 
％TODO：这假设boost标头在/ usr / include中可用，在
％大多数系统上。如果你手动安装boost，请添加-I / path / to / boost 
 mex -v -O ... 
 -output mex_voc_optimize -I ../ src ... 
 -I /user/wok/home/Softwares/Boost_1.54/include/boost ... 
 mex_voc_optimize.cpp matlab_helpers.cpp ... 
 -largeArrayDims

编辑：在Praetorian的第一条评论之后，我添加了 -v 标志。 >

最后，我运行 compile_linux ，只得到一长串错误，我已经缩短和粘贴如下：

 >> compile_linux 
  - > mexopts.sh源自目录（DIR = $ PREF_DIR）
 FILE = /user/wok/home/.matlab/R2012b/mexopts.sh 
 ------------- -------------------------------------------------- -  
  - > matlab = / opt / matlab2012b 
  - > CC = gcc 
  - > CC标志：
 CFLAGS = -ansi -D_GNU_SOURCE -fexceptions -fPIC -fno-omit-frame-pointer -pthread 
 CDEBUGFLAGS = -g 
 COPTIMFLAGS = -O -DNDEBUG 
 CLIBS = -Wl，-rpath-link，/ opt / matlab2012b / bin / glnxa64 -L / opt / matlab2012b / bin / glnxa64 -lmx -lmex -lmat -lm -lstdc ++ 
 arguments = 
  - > CXX = g ++ 
  - > CXX标志：
 CXXFLAGS = -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer -pthread 
 CXXDEBUGFLAGS = -g 
 CXXOPTIMFLAGS = -O -DNDEBUG 
 CXXLIBS =  - wl，-rpath-link，/ opt / matlab2012b / bin / glnxa64 -L / opt / matlab2012b / bin / glnxa64 -lmx -lmex -lmat -lm 
 arguments = 
  - > FC = gfortran 
  - > FC标志：
 FFLAGS = -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer 
 FDEBUGFLAGS = -g 
 FOPTIMFLAGS = -O 
 FLIBS = -Wl，-rpath -link，/ opt / matlab2012b / bin / glnxa64 -L / opt / matlab2012b / bin / glnxa64 -lmx -lmex -lmat -lm 
 arguments = 
  - > LD = g ++ 
  - >链接标志：
 LDFLAGS = -pthread -shared -Wl， -  version-script / opt / matlab2012b / extern / lib / glnxa64 / mexFunction.map -Wl， -  no-undefined 
 LDDEBUGFLAGS = -g 
 LDOPTIMFLAGS = -O 
 LDEXTENSION = .mexa64 
 arguments = 
  - > LDCXX = 
  - >链接标志：
 LDCXXFLAGS = 
 LDCXXDEBUGFLAGS = 
 LDCXXOPTIMFLAGS = 
 LDCXXEXTENSION = 
 arguments = 
 ------------- -------------------------------------------------- -  
 
 
警告：您使用的是gcc版本4.8.2。 MEX当前支持的版本
为4.4.6。 
有关当前支持的编译器列表，请参阅：
 http://www.mathworks.com/support/compilers/current_release/ 
 
  - > g ++ -c -I ../ src -I / user / wok / home / Softwares / Boost_1.54 / include / boost -I / opt / matlab2012b / extern / include -I / opt / matlab2012b / simulink / include -DMATLAB_MEX_FILE  - ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer -pthread -O -DNDEBUGmex_voc_optimize.cpp
 
在包含在/usr/include/c++/4.8.2/cstdint:35中的文件中：0，
 from mex_voc_optimize.cpp：8：
 /usr/include/c++/4.8.2/bits/c++0x_warning.h:32:2：error：#error此文件需要编译器以及ISO C ++ 2011标准的库支持。此支持目前是实验性的，必须使用-std = c ++ 11或-std = gnu ++ 11编译器选项来启用。 
 #error此文件需要编译器和库支持\ 
 ^ 
从../src/lfp.h:18:0，
中包含的文件/src/voc.h:15，
从mex_voc_optimize.cpp：19：
 ../src/timing.h:15:2：错误：'chrono'在命名空间'std'不名a type 
 std :: chrono :: time_point< std :: chrono :: high_resolution_clock>开始时间; 
 ^ 
 ../src/timing.h：在成员函数'double timer :: elapsed_this_period（）const'：
 ../src/timing.h:20:8：error ：'std :: chrono'尚未声明
 std :: chrono :: time_point< std :: chrono :: high_resolution_clock> end_time 
 ^ 
 ../src/timing.h:20:32：error：'std :: chrono'尚未声明
 std :: chrono :: time_point< std :: chrono :: high_resolution_clock> end_time

直到

  ../ src / voc.h：418：31：note：'P'在这里声明，稍后在翻译单元
 alpha [k_best] + = P（j，k_best） 
 ^ 
 ../src/voc.h：在实例化'std :: pair< double，double> virtual :: prediction_function< TFloat> :: compute_function< TFloat> :: compute_objective_c（int）const [with TFloat = double]'：
 ../src/voc.h:328:56： :: compute_objective（）const [with TFloat = double]'
 mex_voc_optimize.cpp：250：39：从这里需要
 ../src/voc.h:315:17：error：'P'未在此范围中声明
 A_c + = P（i，c）; 
 ^ 
 ../src/voc.h:318:17：错误：'P'未在此范围内声明
 D_c + = P（i，c）; 
 ^ 
 
 mex：compile of'mex_voc_optimize.cpp失败。 
 
使用mex时出错（第206行）
无法成功完成。 
 
 compile_linux中的错误（行9）
 mex -O ... 
 
>>

我已经尝试编辑代码以删除对 chrono （用于定时器），然后用映射替换 unordered_map 等， 。我想能够在 matlab / 中编译mex文件，就像我可以在 src /

解决方案

感谢 Praetorian 的评论，我可以指出问题。我在 mexopts.sh 中编辑了错误的行。事实上， CXXFLAGS 出现在3个不同的地方，我已经编辑了标志在第一个地方，但它是必要的，足够的编辑它在第二个地方



查看例如：


 
 code> $ grep -n CXXLIBS /user/wok/home/.matlab/R2012b/mexopts.sh 
 74：CXXLIBS =$ RPATH $ MLIBS -lm
 129：CXXLIBS = $ RPATH $ MLIBS -lm
 199：CXXLIBS =$ MLIBS -lstdc ++


所以我编辑了第129行的行。

  CXX ='g ++'
 CXXFLAGS =' -  ansi -D_GNU_SOURCE'
 CXXFLAGS =$ CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread
 CXXLIBS =$ RPATH $ MLIBS -lm
 b CXXOPTIMFLAGS =' -  O -DNDEBUG'
 CXXDEBUGFLAGS =' -  g'

/ p> 

  CXX ='g ++'
 CXXFLAGS =' -  std = c ++ 11 -fopenmp -march = native -D_GNU_SOURCE '
 CXXFLAGS =$ CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread
 CXXLIBS =$ RPATH $ MLIBS -lm -lgomp
 CXXOPTIMFLAGS =' -  Ofast -DNDEBUG '
 CXXDEBUGFLAGS =' -  g'


I have downloaded the following code:

CVPR 2014 intersection over union optimization code

cvpr2014-iou-code-1.0.zip

http://research.microsoft.com/en-us/downloads/e164fe21-ef2b-4e34-98c1-4868968abb06/

What I get is an archive with two folders, one called src/ and another one called matlab/. I am running Linux Fedora 19 and I can compile the code in src/ just fine. The problem arises when I try to compile the code in matlab/.

The README says:

Matlab compilation
------------------
From within Matlab, configure the compiler using "mex -setup", then adjust the
paths in matlab\compile_windows.m or matlab/compile_linux.m scripts and run
either "compile_linux.m" or "compile_windows.m" in the "matlab" directory.

More specifically for Linux:

Linux
=====

From within Matlab run "mex -setup", then edit the mexopts.sh file and modify
the settings

    CXXFLAGS='-std=c++11 -fopenmp -march=native -D_GNU_SOURCE'
    CXXLIBS="$RPATH $MLIBS -lm -lgomp"
    CXXOPTIMFLAGS='-Ofast -DNDEBUG'

This will enable OpenMP and C++11 and should work from G++ 4.7 onwards.

From the matlab/ directory, call compile_linux to build all mex files.

So I open matlab and run mex -setup. I answer yes to the question:

>> mex -setup

    Options files control which compiler to use, the compiler and link command
    options, and the runtime libraries to link against.

    Using the 'mex -setup' command selects an options file that is
    placed in /user/wok/home/.matlab/R2012b and used by default for 'mex'. An options 
    file in the current working directory or specified on the command line 
    overrides the default options file in /user/wok/home/.matlab/R2012b.

    To override the default options file, use the 'mex -f' command
    (see 'mex -help' for more information).

The options files available for mex are:

  1: /opt/matlab2012b/bin/mexopts.sh : 
      Template Options file for building gcc MEX-files


  0: Exit with no changes

Enter the number of the compiler (0-1):
1

Overwrite /user/wok/home/.matlab/R2012b/mexopts.sh ([y]/n)? 
y

/opt/matlab2012b/bin/mexopts.sh is being copied to 
/user/wok/home/.matlab/R2012b/mexopts.sh


**************************************************************************
  Warning: The MATLAB C and Fortran API has changed to support MATLAB 
           variables with more than 2^32-1 elements.  In the near future 
           you will be required to update your code to utilize the new 
           API. You can find more information about this at: 
           http://www.mathworks.com/help/techdoc/matlab_external/bsflnue-1.html
           Building with the -largeArrayDims option enables the new API. 
**************************************************************************

Then I edit the file /user/wok/home/.matlab/R2012b/mexopts.sh and I follow the instructions from the README:

    CXX='g++'
    CXXFLAGS='-ansi -D_GNU_SOURCE'
    CXXFLAGS="$CXXFLAGS -D_FILE_OFFSET_BITS=64"
    CXXFLAGS="$CXXFLAGS -fPIC -pthread"
    CXXLIBS="$RPATH $MLIBS -lm"
    CXXOPTIMFLAGS='-O -DNDEBUG'
    CXXDEBUGFLAGS='-g'

becomes:

    CXX='g++'
    CXXFLAGS='-std=c++11 -fopenmp -march=native -D_GNU_SOURCE'
    CXXLIBS="$RPATH $MLIBS -lm -lgomp"
    CXXOPTIMFLAGS='-Ofast -DNDEBUG'
    CXXDEBUGFLAGS='-g'

After this step, I open matlab and edit compile_linux.m to add the path to Boost:

% You need to have boost 1.49 or higher installed (package libboost-dev on
% most distributions)
%
% Tested on Ubuntu 13.10, Matlab R2012b, gcc 4.8.1

% TODO: this assumes that boost headers are available in /usr/include, as on
% most systems.  If you manually installed boost, please add -I/path/to/boost
mex -v -O ...
    -output mex_voc_optimize -I../src ...
    -I/user/wok/home/Softwares/Boost_1.54/include/boost ...
    mex_voc_optimize.cpp matlab_helpers.cpp ...
    -largeArrayDims

Edit: Following the first comment from Praetorian, I have added the -v flag.

Finally I run compile_linux, only to get a long list of errors, which I have shortened and pasted below:

>> compile_linux
-> mexopts.sh sourced from directory (DIR = $PREF_DIR)
   FILE = /user/wok/home/.matlab/R2012b/mexopts.sh
----------------------------------------------------------------
->    MATLAB                = /opt/matlab2012b
->    CC                    = gcc
->    CC flags:
         CFLAGS             = -ansi -D_GNU_SOURCE  -fexceptions -fPIC -fno-omit-frame-pointer -pthread
         CDEBUGFLAGS        = -g
         COPTIMFLAGS        = -O -DNDEBUG
         CLIBS              = -Wl,-rpath-link,/opt/matlab2012b/bin/glnxa64 -L/opt/matlab2012b/bin/glnxa64 -lmx -lmex -lmat -lm -lstdc++
         arguments          = 
->    CXX                   = g++
->    CXX flags:
         CXXFLAGS           = -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer -pthread
         CXXDEBUGFLAGS      = -g
         CXXOPTIMFLAGS      = -O -DNDEBUG
         CXXLIBS            = -Wl,-rpath-link,/opt/matlab2012b/bin/glnxa64 -L/opt/matlab2012b/bin/glnxa64 -lmx -lmex -lmat -lm
         arguments          = 
->    FC                    = gfortran
->    FC flags:
         FFLAGS             = -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer
         FDEBUGFLAGS        = -g
         FOPTIMFLAGS        = -O
         FLIBS              = -Wl,-rpath-link,/opt/matlab2012b/bin/glnxa64 -L/opt/matlab2012b/bin/glnxa64 -lmx -lmex -lmat -lm
         arguments          = 
->    LD                    = g++
->    Link flags:
         LDFLAGS            = -pthread -shared -Wl,--version-script,/opt/matlab2012b/extern/lib/glnxa64/mexFunction.map -Wl,--no-undefined
         LDDEBUGFLAGS       = -g
         LDOPTIMFLAGS       = -O
         LDEXTENSION        = .mexa64
         arguments          = 
->    LDCXX                 = 
->    Link flags:
         LDCXXFLAGS         = 
         LDCXXDEBUGFLAGS    = 
         LDCXXOPTIMFLAGS    = 
         LDCXXEXTENSION     = 
         arguments          = 
----------------------------------------------------------------


Warning: You are using gcc version "4.8.2".  The version
         currently supported with MEX is "4.4.6".
         For a list of currently supported compilers see: 
         http://www.mathworks.com/support/compilers/current_release/

-> g++ -c  -I../src -I/user/wok/home/Softwares/Boost_1.54/include/boost -I/opt/matlab2012b/extern/include -I/opt/matlab2012b/simulink/include -DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer -pthread  -O -DNDEBUG  "mex_voc_optimize.cpp"

In file included from /usr/include/c++/4.8.2/cstdint:35:0,
                 from mex_voc_optimize.cpp:8:
/usr/include/c++/4.8.2/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
In file included from ../src/lfp.h:18:0,
                 from ../src/voc.h:15,
                 from mex_voc_optimize.cpp:19:
../src/timing.h:15:2: error: ‘chrono’ in namespace ‘std’ does not name a type
  std::chrono::time_point<std::chrono::high_resolution_clock> start_time;
  ^
../src/timing.h: In member function ‘double timer::elapsed_this_period() const’:
../src/timing.h:20:8: error: ‘std::chrono’ has not been declared
   std::chrono::time_point<std::chrono::high_resolution_clock> end_time
        ^
../src/timing.h:20:32: error: ‘std::chrono’ has not been declared
   std::chrono::time_point<std::chrono::high_resolution_clock> end_time

until

../src/voc.h:418:31: note: ‘P’ declared here, later in the translation unit
    alpha[k_best] += P(j,k_best);
                               ^
../src/voc.h: In instantiation of ‘std::pair<double, double> voc::prediction_function<TFloat>::compute_objective_c(int) const [with TFloat = double]’:
../src/voc.h:328:56:   required from ‘double voc::prediction_function<TFloat>::compute_objective() const [with TFloat = double]’
mex_voc_optimize.cpp:250:39:   required from here
../src/voc.h:315:17: error: ‘P’ was not declared in this scope
     A_c += P(i,c);
                 ^
../src/voc.h:318:17: error: ‘P’ was not declared in this scope
     D_c += P(i,c);
                 ^

    mex: compile of ' "mex_voc_optimize.cpp"' failed.

Error using mex (line 206)
Unable to complete successfully.

Error in compile_linux (line 9)
mex -O ...

>>

I have tried editing the code to remove every call to chrono (for timers), then to replace unordered_map with map, etc., but it is a pain. I would like to be able to compile the mex file in matlab/ just like I can compile the c++ code in src/

解决方案

Thanks to Praetorian's comment, I could pinpoint the problem. I had edited the wrong lines in mexopts.sh. Indeed, the CXXFLAGS appears at 3 different places, I had edited the flags at the first place, but it was necessary and sufficient to edit it at the second place (the first place was a decoy).

See for instance:

$ grep -n CXXLIBS /user/wok/home/.matlab/R2012b/mexopts.sh
74:             CXXLIBS="$RPATH $MLIBS -lm"
129:            CXXLIBS="$RPATH $MLIBS -lm"
199:            CXXLIBS="$MLIBS -lstdc++"

So I edited the lines around line 129. The following lines

        CXX='g++'
        CXXFLAGS='-ansi -D_GNU_SOURCE'
        CXXFLAGS="$CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread"
        CXXLIBS="$RPATH $MLIBS -lm"
        CXXOPTIMFLAGS='-O -DNDEBUG'
        CXXDEBUGFLAGS='-g'

become

        CXX='g++'
        CXXFLAGS='-std=c++11 -fopenmp -march=native -D_GNU_SOURCE'
        CXXFLAGS="$CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread"
        CXXLIBS="$RPATH $MLIBS -lm -lgomp"
        CXXOPTIMFLAGS='-Ofast -DNDEBUG'
        CXXDEBUGFLAGS='-g'

这篇关于在Matlab mex文件中编译c ++ 11代码时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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