Build failure when linking DUB dependencies with long names

[mbierlee]

System information

• dub version: DUB version 1.30.0, built on Nov 14 2022
• OS Platform and distribution: Windows 10
• compiler version DMD32 D Compiler v2.101.0-dirty

Bug Description

When adding a dub project with a very long name, a linker error occurs. In the following example it tries to build a dependency called poodinis-mirage-config-injector:

Build directory C:\Users\[..]\AppData\Local\dub\packages\poodinis-mirage-config-injector-1.0.1\poodinis-mirage-config-injector\.dub\build\library-debug-windows-x86_64-dmd_v2.101.0-dirty-AD9F674B70EEEA986AF59B29018C0DC50245C96E020D599F9A3615568E3B78BA\ is not writable. Falling back to direct build in the system's temp folder.
    Building poodinis-mirage-config-injector 1.0.1 [library]
    Building dublongpaths ~master: building configuration [application]
     Linking dublongpaths
lld-link: error: undefined symbol: _D8poodinis13valueinjector6mirage10loadConfigFOCQBu9container19DependencyContainerxAyaZv
>>> referenced by D:\Temp\dublongpaths\source\app.d:22
>>>               .dub\build\application-debug-windows-x86_64-dmd_v2.101.0-dirty-BEE0070E13F5C7E5928CD6E33EABF03EF415566C2C52A4FE23C21BB581FD23B2\dublongpaths.obj:(_Dmain)

lld-link: error: undefined symbol: _D8poodinis13valueinjector6mirage12__ModuleInfoZ
>>> referenced by .dub\build\application-debug-windows-x86_64-dmd_v2.101.0-dirty-BEE0070E13F5C7E5928CD6E33EABF03EF415566C2C52A4FE23C21BB581FD23B2\dublongpaths.obj:(_D3app12__ModuleInfoZ)
Error: linker exited with status 1
Error D:\DLang\dmd2\windows\bin\dmd.exe failed with exit code 1.

This is possibly related to issue #911. The dependency fails to compile so the linker fails to find the lib.

How to reproduce?

See project: dublongpaths.zip
Just dub run it.

[mbierlee]

The problem lies in the writeFile function in:

dub/source/dub/internal/vibecompat/core/file.d

Line 26 in abe51f7

public void writeFile(NativePath path, const void[] buffer)

It fails to write the test file from:

dub/source/dub/generators/build.d

Line 264 in 4ff336e

if (!isWritableDir(target_path, true)) {

One possible fix it to prefix the path with \\?\. See also: https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry

[mbierlee]

I have since renamed the project to be shorter. The attached example project might not work as-is anymore.

[WebFreak001]

fixed by #2589