Is the path segment onedev-build3100065178529808779 too long for msvc?

I am not familiar with msvc things. If possible, please attach an example project with detailed instructios on how to reproduce the issue so that I can test locally to see if things are fixed.

Is the path segment onedev-build3100065178529808779 too long for msvc?

I think yes its most long section in full path D:\a\onedev-agent\onedev-agent\agent\work\temp\onedev-build3100065178529808779\workspace

I am not familiar with msvc things. If possible, please attach an example project with detailed instructios on how to reproduce the issue so that I can test locally to see if things are fixed.

I think you can have any content in file but path need equal like this D:\a\onedev-agent\onedev-agent\agent\work\temp\onedev-build3100065178529808779\workspace\hl2sdk-cs2\public\tier0\memoverride.cpp

And build system same AMBuild

Install:

python3 -m pip install --upgrade pip setuptools wheel
pip3 install git+https://github.com/alliedmodders/ambuild

Usage:

ambuild --new-project // in project dir

After new prj we have 2 files AMBuildScript and configure.py AMBuildScript have content like this:

# vim: set sts=4 ts=8 sw=4 tw=99 et ft=python:
builder.cxx = builder.DetectCxx()
if builder.cxx.like('gcc'):
    builder.cxx.cflags += [
        '-Wall',
        '-Werror'
    ]

program = builder.cxx.Program('sample')
program.sources += [
    'some-path who lenght equal needed or little bit long if you dont have prefix like this main.cpp', # D:\a\onedev-agent\onedev-agent\agent\work
]
builder.Add(program)

After editing:

python3 configure.py
ambuild objdir

Some main.cpp file:

#include <iostream>

int main()
{
    std::cout << "Some string" << std::endl;
    return 0;
}

Thanks for the detailed guide. Looks like msvc does not like long path. The workspace directory will be changed to use project id and build number combo to make it shorter. But I think this error may still occur when project files are nested deeper...

State changed as code fixing the issue is committed (d6279e5b)

State changed as build #4264 is successful