Error when using vl_compilenn: cannot found cl.exe in path

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Woranut Iampa
Woranut Iampa 2016-7-16
评论： Walter Roberson 2020-3-11
I got errors when running vl_compilenn as follows:
>> vl_compilenn
Warning: CL.EXE not found in PATH. Trying to guess out of mex setup.
> In vl_compilenn>check_clpath (line 566) In vl_compilenn (line 400) 'cl.exe' is not recognized as an internal or external command, operable program or batch file. Error using vl_compilenn>check_clpath (line 577) Unable to find cl.exe
Error in vl_compilenn (line 400) check_clpath(); % check whether cl.exe in path
I use MATLAB2015b on Windows 10, Microsoft Visual C++ 2013 Professional (C) for C language compilation, and Visual Studio 2013.
Also, I tried to set the Path and Environment Variables for Command-Line Builds as following command: C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC>vcvarsall x86_amd64 on the VS2012 x64 Cross Tools Command Prompt.
But, it cannot fix my problem. Could you please give me solution for this error.
Thank you for your help.
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回答（4 个）

Major_He
Major_He 2017-5-9
I have just solved this problem by reading this webpage: http://stackoverflow.com/questions/40226354/matconvnet-error-cl-exe-not-found
I use Matlab R2016b on windows 10, Visual Studio 2017 Community. Visual Studio 2017 works well in my computer when compiling C/C++ programs, and I just add a new path (the folder containing cl.exe in Visual Studio installed path) to computer's Environment Variables. Then, this problem solved.
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Walter Roberson
Walter Roberson 2017-10-22
Jon Slow: No, Major_He was using Visual Studio 2017 Community.
Note: to use VS 2017 with MATLAB R2016b or R2017a you need to install a patch.
Andrew Mao
Andrew Mao 2018-9-26
编辑：Walter Roberson 2018-9-26
Thank you so much! This has been terribly frustrating. If anyone happens to get a different error after this, go here and follow the most liked response: https://github.com/vlfeat/matconvnet/issues/501

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Shaode Yu
Shaode Yu 2019-4-12
% (1) Unable to find cl.exe
% (a) Adding the directory with cl.exe to the system PATH variable
% (b) Restart MATLAB
% (c) Compile (1) mex -setup C++ (2) vl_compilenn
% Reason: The check_clpath() needs to know the proper location cl.exe
% https://stackoverflow.com/questions/40226354/matconvnet-error-cl-exe-not-found
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Walter Roberson
Walter Roberson 2019-4-12
That code is expecting a Visual Studios compiler, and would not work with MinGW or lcc.
Shaode Yu
Shaode Yu 2019-4-12
Right.
It requires Visual Studio compiler. In particular, MatConvNet requires Visual Studio 2015 and later. It is a prerequisite.
In addition, install the software Everything (https://www.voidtools.com/downloads/) and you can find all files on your computer.
Enjoy.

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Walter Roberson
Walter Roberson 2017-5-9
Typically this error occurs when you have a Community edition or Express edition of Visual Studio installed but your MATLAB version only expects the corresponding Professional version.
Ayshath Afra
Ayshath Afra 2020-3-10
Error in vl_compilenn (line 417)
cl_path = fileparts(check_clpath()); % check whether cl.exe in path
anyone pls help to solve this error in matlab
this error is showing while compiling matconvnet.
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Ayshath Afra
Ayshath Afra 2020-3-11
Compiler is MinGW64
& the warning is : The MATLAB C and Fortran API has changed to support MATLAB
variables with more than 2^32-1 elements. You will be required to update your code to utilize the new API.
Walter Roberson
Walter Roberson 2020-3-11
It will never be possible to compile that program with MinGW. You should give up trying.
Either install Visual Studios 2017 Community Edition, or else give up on using the software.

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