failed to run custom build command for mozjs_sys v0.68.1

[santoshpavan]

I am not sure what is causing this error while building. Build worked fine a few days ago.
Windows 10 OS.
Here is the entire error-
https://gist.github.com/santoshpavan/cd7bffa5ae1491df9c2d5d1a25f4fbe9

I have tried removing python 3 from path as mentioned in this Issue - #13550
It hasn't worked for me.

Any help is much appreciated. Thank you.

[jdm]

cargo:warning=C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\include\yvals_core.h(294,5):  error: STL1000: Unexpected compiler version, expected Clang 7 or newer.
cargo:warning=   #error STL1000: Unexpected compiler version, expected Clang 7 or newer.

This is strange, since the Servo build system sets up clang 8 to be in the path before the build begins. This suggests to me that you may have another version of LLVM installed that is conflicting; is it possible to uninstall that?

[santoshpavan]

I had installed LLVM as it was mentioned in the pre-requisites that it would speed the build up on windows.
I uninstalled it now and ran the build again.
It has failed and the same error has been shown.
The error in detail - https://gist.github.com/santoshpavan/7190cb869a55fc512160eaf9fce98d98

[jdm]

Try and figure out what clang-cl.exe is actually pointing to? It seems to believe there's an older version of clang installed still.

[jdm]

Maybe you installed clang through visual studio as well?

[santoshpavan]

I found that the clang that is being mapped is the clang that belongs to Anaconda.
Anaconda seems to be hijacking the clang. So, I have uninstalled it and tried the build.
(If I understand right, I should not installed the clang separately as it is taken care of during the build. Please correct me if I am wrong here.)

1. Just to make sure, I uninstalled and installed the Visual Studio carefully using chocolaty.
2. I also cloned the repo again to build from the beginning.
3. I checked if clang was indeed already there using clang --version which showed that it is not there.

The build has failed. The complete error build can be found here - https://gist.github.com/santoshpavan/5cf98dc67ee5fdda12ce797e61d176f0
If I am understanding right, the error is because of Python 2.7? But I checked, it is in the environment variables.
Can you please suggest what is to be done in this case?
Thank you.

[jdm]

The error is:

DEBUG: Executing: `c:/servo/.servo/msvc-dependencies/llvm/8.0.1/bin/clang-cl.exe -Xclang -std=gnu99 -I 'C:/Program Files (x86)/Windows Kits/10/include/10.0.17763.0/um' -I 'C:/Program Files (x86)/Windows Kits/10/include/10.0.17763.0/shared' -E 'c:\users\santo\appdata\local\temp\conftest.z9mzyg.c'`
INFO: 0x0a00 in 'C:\Program Files (x86)\Windows Kits\10\'
INFO: checking for Universal CRT SDK...
INFO: 10.0.17763.0 in 'C:\Program Files (x86)\Windows Kits\10\'
ERROR: GetShortPathName returned a long path name: `c:/PROGRA~2/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/HostX64/x64/cl.exe`. Use `fsutil file setshortname' to create a short name for any components of this path that have spaces.

I've never seen that before!

[skrzyp1]

I had same problem while setting env in fresh VM.
Using suggested solution actually worked:
fsutil file setshortname "C:/PROGRA~2/Windows Kits" wk~1
I had to use it one more time on another path with spaces and build passed.
fsutil file setshortname "C:/PROGRA~2/Microsoft Visual Studio" msvs