[llvm-dev] Windows build strangeness

[Valentin Churavy via llvm-dev]

What kind of missing symbols are you getting?
I had to work around dependencies for a Mingw32 build. See
https://reviews.llvm.org/D44650

On Wed, May 16, 2018, 13:13 via llvm-dev <llvm-dev at lists.llvm.org> wrote:

> I have the git monorepo, and Visual Studio 2015.  I am finding that
> running a build from the command line with msbuild (as a nightly job)
> invariably fails on the first try, and succeeds on a retry.
>
> The first msbuild command looks like this:
>
> msbuild ALL_BUILD.vcxproj /p:Configuration="RelWithDebInfo" /m:6 /t:Rebuild
>
> This appears to compile everything okay, but invariably fails with
> some set of link-time errors, reporting missing symbols.  Then I run
> msbuild again, but without the /t:Rebuild (thus it's a dirty build the
> second time) and this succeeds.
>
> Is there some inadequacy in the CMake dependencies somewhere, so that
> some links are trying to happen before the libraries are completely
> finished?  Or just an msbuild issue?
>
> I made my nightly script check for errors and run the second round,
> because it has been happening so consistently, but a proper build
> system shouldn't require such a workaround.
>
> For reference, I generated the sln/project files like this:
>
> cmake -G "Visual Studio 14 Win64" -Thost=x64 ^
>   -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_OPTIMIZED_TABLEGEN=ON ^
>   -DLLVM_ENABLE_PROJECTS="llvm;clang;clang-tools-extra" ^
>   ..\llvm-project\llvm
>
> (Yes I know the optimized tablegen comes from a separate tree,
> that's built separately and always works.  It's just the main
> build that fails.)
>
> Thanks,
> --paulr
>
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