[flang-commits] [clang] [flang] [llvm] [mlir] [polly] [CMake][LLVM] Add PCH infrastructure and LLVMSupport PCH (PR #176420)

[Aaron Ballman via flang-commits]

AaronBallman wrote:

FWIW, I'm starting to consistently see warnings in Visual Studio 2026:
```
F:\source\llvm-project\llvm\lib\Analysis\ConstantFolding.cpp : warning C4652: compiler option 'support for new floating-point model (/FP)' inconsistent with precompiled header; current command-line option will override that defined in the precompiled header
F:\source\llvm-project\llvm\lib\Analysis\ConstantFolding.cpp : warning C4653: compiler option 'Optimizations (one or more of /Oawstgp[y]) or debug checks (one or more of /GZ, /RTCcsu)' inconsistent with precompiled header; current command-line option ignored
```
this is after doing a clean when doing the initial rebuild.


https://github.com/llvm/llvm-project/pull/176420