Package fetching has regressed on Windows

[squeek502]

Zig Version

0.12.0-dev.878+7abf9b3a83

Steps to Reproduce and Observed Behavior

Regressed in #17392

Building zls on latest master:

> zig build -Doptimize=ReleaseSafe
C:\Users\Ryan\Programming\Zig\zls\zig-cache\o\8c6656817d7b9ba969d47a90c375e93f\dependencies.zig:3:70: error: invalid escape character: 'p'
        pub const build_root = "C:\\Users\\Ryan\\AppData\\Local\\zig\p\\1220363c7e27b2d3f39de6ff6e90f9537a0634199860fea237a55ddb1e1717f5d6a5";
                                                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\Ryan\Programming\Zig\zls\zig-cache\o\8c6656817d7b9ba969d47a90c375e93f\dependencies.zig:8:70: error: invalid escape character: 'p'
        pub const build_root = "C:\\Users\\Ryan\\AppData\\Local\\zig\p\\122089a8247a693cad53beb161bde6c30f71376cd4298798d45b32740c3581405864";
                                                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\Users\Ryan\Programming\Zig\zls\zig-cache\o\8c6656817d7b9ba969d47a90c375e93f\dependencies.zig:13:70: error: invalid escape character: 'p'
        pub const build_root = "C:\\Users\\Ryan\\AppData\\Local\\zig\p\\1220bb12c9bfe291eed1afe6a2070c7c39918ab1979f24a281bba39dfb23f5bcd544";
                                                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

With 0.12.0-dev.819+75b48ef50 (one build before #17392 was merged):

> "C:\Users\Ryan\Programming\Zig\zig-downloaded\zig-windows-x86_64-0.12.0-dev.819+75b48ef50\zig" build -Doptimize=ReleaseSafe

(success)

Expected Behavior

Successful fetching and compilation

[der-teufel-programming]

I'll take a look at this since I've also stared having problems with building zls

[squeek502]

@der-teufel-programming I've found a fix already: #17478

[squeek502]

By the way, this can also manifest as this error:

> zig build -Doptimize=ReleaseSafe
warning: FileNotFound: C:\Users\Ryan\AppData\Local\zig\p\1220363c7e27b2d3f39de6ff6e90f9537a0634199860fea237a55ddb1e1717f5d6a5\build.zig
error: FileNotFound

I'm unsure exactly why I stopped hitting that error and started hitting the compile error in the generated dependencies.zig. Something cache related I'm sure.

[llogick]

By the way, this can also manifest as this error:

> zig build -Doptimize=ReleaseSafe
warning: FileNotFound: C:\Users\Ryan\AppData\Local\zig\p\1220363c7e27b2d3f39de6ff6e90f9537a0634199860fea237a55ddb1e1717f5d6a5\build.zig
error: FileNotFound

I'm unsure exactly why I stopped hitting that error and started hitting the compile error in the generated dependencies.zig. Something cache related I'm sure.

Greetings,

ZLS' CI just pulled latest zig, but is still failing with FileNotFound,

{
 "zig_exe": "C:\\hostedtoolcache\\windows\\zig\\master\\x64\\zig.exe",
 "lib_dir": "C:\\hostedtoolcache\\windows\\zig\\master\\x64\\lib",
 "std_dir": "C:\\hostedtoolcache\\windows\\zig\\master\\x64\\lib\\std",
 "global_cache_dir": "C:\\Users\\runneradmin\\AppData\\Local\\zig",
 "version": "0.12.0-dev.881+42998e637",
 "target": "x86_64-windows.win10_fe...win10_fe-gnu"
}