我已下载the following code：
CVPR 2014交叉联合优化代码
cvpr2014-iou-code-1.0.zip
http://research.microsoft.com/en-us/downloads/e164fe21-ef2b-4e34-98c1-4868968abb06/
我得到的是一个包含两个文件夹的存档，一个名为src/，另一个名为matlab/。我正在运行Linux Fedora 19，我可以在src/编译代码就好了。当我尝试在matlab/中编译代码时出现问题。
自述文件说：
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.
更具体地针对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 $MLIBS -lm -lgomp" CXXOPTIMFLAGS='-Ofast -DNDEBUG' This will enable OpenMP and C++11 and should work from G++ 4.7 onwards. From the matlab/ directory, call compile_linux to build all mex files.
所以我打开matlab并运行mex -setup。我回答yes问题：
>> mex -setup
Options files control which compiler to use, the compiler and link command
options, and the runtime libraries to link against.
Using the 'mex -setup' command selects an options file that is
placed in /user/wok/home/.matlab/R2012b and used by default for 'mex'. An options
file in the current working directory or specified on the command line
overrides the default options file in /user/wok/home/.matlab/R2012b.
To override the default options file, use the 'mex -f' command
(see 'mex -help' for more information).
The options files available for mex are:
1: /opt/matlab2012b/bin/mexopts.sh :
Template Options file for building gcc MEX-files
0: Exit with no changes
Enter the number of the compiler (0-1):
1
Overwrite /user/wok/home/.matlab/R2012b/mexopts.sh ([y]/n)?
y
/opt/matlab2012b/bin/mexopts.sh is being copied to
/user/wok/home/.matlab/R2012b/mexopts.sh
**************************************************************************
Warning: The MATLAB C and Fortran API has changed to support MATLAB
variables with more than 2^32-1 elements. In the near future
you will be required to update your code to utilize the new
API. You can find more information about this at:
http://www.mathworks.com/help/techdoc/matlab_external/bsflnue-1.html
Building with the -largeArrayDims option enables the new API.
**************************************************************************
然后我编辑文件/user/wok/home/.matlab/R2012b/mexopts.sh，并按照自述文件中的说明进行操作：
CXX='g++' CXXFLAGS='-ansi -D_GNU_SOURCE' CXXFLAGS="$CXXFLAGS -D_FILE_OFFSET_BITS=64" CXXFLAGS="$CXXFLAGS -fPIC -pthread" CXXLIBS="$RPATH $MLIBS -lm" CXXOPTIMFLAGS='-O -DNDEBUG' CXXDEBUGFLAGS='-g'
变为：
CXX='g++' CXXFLAGS='-std=c++11 -fopenmp -march=native -D_GNU_SOURCE' CXXLIBS="$RPATH $MLIBS -lm -lgomp" CXXOPTIMFLAGS='-Ofast -DNDEBUG' CXXDEBUGFLAGS='-g'
完成此步骤后，我会打开matlab并修改compile_linux.m以添加Boost的路径：
% 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
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，只是为了获得一长串错误，我已将其缩短并粘贴在下面：
>> 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
，直到
../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 ...
>>
我尝试编辑代码以删除对chrono的每次调用（针对计时器），然后将unordered_map替换为map等，但这很痛苦。我希望能够在matlab/中编译mex文件，就像我可以编译src/中的c ++代码一样
答案 0 :(得分：5)
感谢Praetorian的评论，我可以查明问题所在。我在mexopts.sh编辑了错误的行。实际上，CXXFLAGS出现在3个不同的地方，我在第一个地方编辑了旗帜，但是在第二个地方编辑它是必要和充分的（第一个地方是诱饵）。
参见例如：
$ 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行的线。以下几行
CXX='g++'
CXXFLAGS='-ansi -D_GNU_SOURCE'
CXXFLAGS="$CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread"
CXXLIBS="$RPATH $MLIBS -lm"
CXXOPTIMFLAGS='-O -DNDEBUG'
CXXDEBUGFLAGS='-g'
成为
CXX='g++'
CXXFLAGS='-std=c++11 -fopenmp -march=native -D_GNU_SOURCE'
CXXFLAGS="$CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread"
CXXLIBS="$RPATH $MLIBS -lm -lgomp"
CXXOPTIMFLAGS='-Ofast -DNDEBUG'
CXXDEBUGFLAGS='-g'