Bug 22630 – It is possible for VS to be installed and providing VC directory without VC libraries being installed

As of: VS 2022 dmd 2.098.1 but may also effect going back to 2.091 as per issues 22525 and 21867. Known environment to cause this: For VS install with just F#. During installer of dmd select MinGW. During linking it is known that: /LIBPATH:"C:\Program Files\Microsoft Visual Studio\2022\Community\VC\lib\amd64" will be added. It will error with: lld-link: error: could not open 'libcmt.lib': no such file or directory Directory that does exist: C:\Program Files\Microsoft Visual Studio\2022\Community\VC But not: C:\Program Files\Microsoft Visual Studio\2022\Community\VC\lib This may be fixable by changing getVCLibDir to check before returning that the path returned actually exists and not just return whatever it thinks should be the location.

We have a confirmed fix: const(char)* getVCLibDir(bool x64) const { const(char)* proposed; if (VCToolsInstallDir !is null) proposed = FileName.combine(VCToolsInstallDir, x64 ? r"lib\x64" : r"lib\x86"); else if (VCInstallDir !is null) proposed = FileName.combine(VCInstallDir, x64 ? r"lib\amd64" : "lib"); return FileName.exists(proposed) ? proposed : null; }

@rikkimax created dlang/dmd pull request #13464 "fix issue 22630 - It is possible for VS to be installed and providing…" fixing this issue: - fix issue 22630 - It is possible for VS to be installed and providing VC directory without VC libraries being installed https://github.com/dlang/dmd/pull/13464

dlang/dmd pull request #13464 "fix issue 22630 - It is possible for VS to be installed and providing…" was merged into stable: - e85775f98724312d349594338982496f95bbd226 by rikki cattermole: fix issue 22630 - It is possible for VS to be installed and providing VC directory without VC libraries being installed https://github.com/dlang/dmd/pull/13464