Problems with Pip Install Numpy - Runtimeerror: Broken Toolchain: Cannot Link a Simple C Program

Problems with pip install numpy - RuntimeError: Broken toolchain: cannot link a simple C program

While it's ugly, it appears to work

sudo ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install --upgrade numpy

Note that if you are getting this error for a package other than numpy, (such as lxml) specify that package name instead of numpy at the end of the commnd.

I saw a similar issue someone was having with installing a gem

Ruby Gem install Json fails on Mavericks and Xcode 5.1 - unknown argument: '-multiply_definedsuppress'

This is only a temporary fix, at some point the compiler options will have to be fixed

Numpy install Broken toolchain: cannot link a simple C program

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.

Compiler problems with pip during numpy install under Windows 8.1, 7 Enterprise and 7 Home Editions

I was able to reproduce all these errors in Windows 7 Professional (64 bit).

Your final issue (Broken toolchain) is caused by more manifest related issues. I was able to work around this by changing the following line (in msvc9compiler.py):

mfinfo = self.manifest_get_embed_info(target_desc, ld_args)

to

mfinfo = None

thus bypassing the if statement which immediately follows. After this change numpy successfully compiled for me.

Error when installing scipy: Broken toolchain

A good advice is to downgrade to Python 3.7.

It seems like you are trying to install a project on Python 3.8. This version of Python is very recent and for this reason not all projects have been thoroughly tested against it and thus they might not even be easy to install on it to begin with.

Eventually retry in a few weeks or months with Python 3.8, by that time the maintainers of the project might have had time to do some more tests and might have improved the installation process on Python 3.8.

Installing the project on Python 3.8 today, might still be feasible but would most likely require much more effort, such as installing and configuring a build toolchain for the C/C++ extensions. Alternatively it might be worth checking out Christoph Gohlke's Unofficial Windows Binaries for Python Extension Packages, this 3rd party offers for pre-built wheel distributions for Windows exclusively.

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