[llvm] [llvm-jitlink] Explicit exports for builtin runtime functions in MinGW executables (PR #107375)

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Stefan =?utf-8?q?Gränitz?= <stefan.graenitz at gmail.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/107375 at github.com>


dyung wrote:

> > LLVM Buildbot has detected a new failure on builder `ppc64-flang-aix` running on `ppc64-flang-aix-test` while building `llvm` at step 4 "cmake-configure".
> > Full details are available at: https://lab.llvm.org/buildbot/#/builders/201/builds/2954
> > Here is the relevant piece of the build log for the reference
> 
> @weliveindetail This bot's failure seems related to your change, can you take a look?
> 
> I also suspect that your change broke building with MSVC in a non-ninja build on our internal builder. I'm trying to verify it now.

I have now confirmed that it is this change which is causing the build to break. I can build the previous commit with no errors, but when I try to build this commit using VS2019, I get the following error:
```
 460:2>LINK : fatal error LNK1104: cannot open file 'Z:/b/llvm-clang-x86_64-sie-win/build/tools/llvm-jitlink/llvm-jitlink.def' [Z:\b\llvm-clang-x86_64-sie-win\build\tools\llvm-jitlink\llvm-jitlink.vcxproj]
```
If I try to find the file it is looking for, it is being put in an obviously wrong directory:
```
Z:\b\llvm-clang-x86_64-sie-win\build>dir /S llvm-jitlink.def
 Volume in drive Z is RAMDisk
 Volume Serial Number is AA6A-8245

 Directory of Z:\b\llvm-clang-x86_64-sie-win\build\tools\llvm-jitlink\$(Configuration)

02/15/2025  02:12 AM               370 llvm-jitlink.def
               1 File(s)            370 bytes

     Total Files Listed:
               1 File(s)            370 bytes
               0 Dir(s)   7,982,059,520 bytes free
```
For reference, here is the cmake command I used:
```
cmake -G "Visual Studio 16 2019" -A x64 -DCMAKE_BUILD_TYPE=Release -DCLANG_ENABLE_ARCMT=OFF -DCLANG_ENABLE_CLANGD=OFF -DLLVM_CCACHE_BUILD=ON -DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-sie-ps5 -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_VERSION_SUFFIX= -DLLVM_BUILD_RUNTIME=OFF -DLLVM_ENABLE_ASSERTIONS=ON "-DLLVM_LIT_ARGS=--verbose" "-DLLVM_ENABLE_PROJECTS=clang;lld;llvm;cross-project-tests;clang-tools-extra" ../llvm-project/llvm
```
And here is the msbuild command that I used:
```
msbuild.exe /t:Rebuild /p:Configuration=Release /noconlog /m /flp1:Summary;Verbosity=normal;LogFile=buildr.log /flp2:warningsonly;LogFile=buildr.wrn /flp3:errorsonly;LogFile=buildr.err ALL_BUILD.vcxproj
```
I'm going to revert the change for now to unbreak the builds.

https://github.com/llvm/llvm-project/pull/107375