visual - vs 2017 where is cl exe

nvcc fatal:Cannot find compiler 'cl.exe' in PATH although Visual Studio 12.0 is added to PATH (3)

I have followed all the instructions from but can't seem to get it work.

I have added C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin to my PATH variable

Every time I run the code from the Theano website to test whether a CPU or GPU is used, it gives me a fatal error of "nvcc fatal : Cannot find compiler 'cl.exe' in PATH"

Here is the code I use to test:

from theano import function, config, shared, sandbox
import theano.tensor as T
import numpy
import time

vlen = 10 * 30 * 768  # 10 x #cores x # threads per core
iters = 1000

rng = numpy.random.RandomState(22)
x = shared(numpy.asarray(rng.rand(vlen), config.floatX))
f = function([], T.exp(x))
t0 = time.time()
for i in range(iters):
    r = f()
t1 = time.time()
print("Looping %d times took %f seconds" % (iters, t1 - t0))
print("Result is %s" % (r,))
if numpy.any([isinstance(x.op, T.Elemwise) for x in f.maker.fgraph.toposort()]):
    print('Used the cpu')
    print('Used the gpu')

How can I solve this?

I had the same problem. I'm using 64 bit Windows 8.1 and I had to add the following to my path and now it works fine:

C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64

C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64\cl.exe

Hope this helps

I had this problem in a different context (Elixir, Pheonix), but the root cause was the same: cl.exe could not be found during compilation.

My setup was:

  • Windows 10, x64
  • Visual Studio Community 2017 already installed, but only for C# development

For some reason the solution with installing the Visual C++ Build Tools (as @cozzamara suggested) did not work. Stops during installation with some obscure error message. Guess it did not liked my existing Visual Studio installation.

This is how I solved it:

  1. Start up the Visual Studio Installer
  2. Check the Desktop development with C++ (screenshots here)
  3. Execute following command before compiling:

    C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat

    From this on the command cl.exe works. Alternatively start the application 'Developer Command Prompt for VS 2017' or 'x64 Native Tools Command Prompt VS 2017'.