[llvm-dev] Ninja hangs when I try to build

[Adrian McCarthy via llvm-dev]

Sorry, I'm not familiar with "the usual message about switching from the
32-bit to the 64-bit linker."  Can you elaborate?

> Is there an easy way to turn off PDB creation?

Probably, but I don't know it offhand.  The MS linker is going to produce a
PDB by default if /DEBUG is specified, and it's pretty common to generate
them for "release" builds as well.

My guess is that you're building multiple configurations at once, and
different configurations (e.g., 32- and 64-bit, or debug and release) are
trying to write their own PDBs to the same file name.  I generally only
build one configuration at a time, and I use ninja (even with MSVC) rather
than the Visual Studio solution.  Off the top of my head, exactly where the
Cmake-generated build configurations try to place the PDBs.

On Tue, Dec 8, 2020 at 1:17 PM Paul C. Anagnostopoulos <paul at windfall.com>
wrote:

> Thank you! I killed mspdbsrv and things got much further. Now I'm getting
> the usual message about switching from the 32-bit to the 64-bit linker, and
> then an "Unexpected PDB error; RPC (23)" message. This has been going on
> for awhile.
>
> Is there an easy way to turn off PDB creation?
>
> At 12/8/2020 02:17 PM, Adrian McCarthy wrote:
> >The program database manager is a separate process VS uses to compile
> debug info into a PDB.  The error happens when it's trying to update a PDB
> that was created (or last modified) by a newer version of the PDB manager.
> >
> ><
> https://docs.microsoft.com/en-us/cpp/error-messages/compiler-errors-1/fatal-error-c1902?view=msvc-160
> >
> https://docs.microsoft.com/en-us/cpp/error-messages/compiler-errors-1/fatal-error-c1902?view=msvc-160
> >
> >I suspect you have more than one version of VS installed.
> >
> >I would close all instances of Visual Studio, check your environment to
> ensure that your build is set up to use the specific version you're
> expecting, and make sure there are no lingering processes runningÂ
> mspdbsrv.exe, and then try again.  If the problem recurs after that, I'd
> repeat but also delete the PDB files in question and force the compiler to
> rebuild them from scratch.
>
>
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