Numpy install Broken toolchain: cannot link a simple C program

Question

System:

Windows 10
Python 3.7
Numpy 1.15.1
VS 2017

I don't believe this is a duplicate as the following proposed resolutions have failed:

(for homebrew - N/A) Numpy Install RuntimeError: Broken toolchain: cannot link a simple C program
(Unanswered) PyCharm pip installs fail, RuntimeError: Broken toolchain: cannot link a simple C program
(Windows no sudo) Problems with pip install numpy - RuntimeError: Broken toolchain: cannot link a simple C program

Additional Note: I don't have network access so I'm using 'basket' my install line is as follows:

pip install --no-index -f .basked numpy

I've run this in the command prompt, power shell, and VS command prompt

Final Error in Traceback:

 377, in generate_sources
        source = func(extension, build_dir)
      File "numpy\core\setup.py", line 666, in get_mathlib_info
        raise RuntimeError("Broken toolchain: cannot link a simple C program")
    RuntimeError: Broken toolchain: cannot link a simple C program

Presumably, NumPy can't find the C linker (or compiler). I guess that'll be because NumPy is installed with a wheel or some other form of precompiled binary. You'll have to ensure somehow that the C compiler and linker are available in the command prompt or shell, by setting the right values of path. Possibly, VS should show you somewhere in its settings where these programs are located. — 9769953
– 9769953, Commented Sep 10, 2018 at 21:38
Compiling is a hard way, maybe you can just download anaconda — Evgeny
– Evgeny, Commented Sep 10, 2018 at 22:02

chjortlund · Accepted Answer · 2020-05-02 17:52:32Z

4

I just answered the exact same question here: https://stackoverflow.com/a/61563861/209532

In short: You need to have mt.exe on the path to compile, Since Visual Studio 2017, is has been removed and is now to be found in the Windows SDK.

answered May 2, 2020 at 17:52

chjortlund

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1 Comment

Dharman Over a year ago

Why not close it as a duplicate?

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