[Development] Failed to run configure.bat in qt/qt5 repository on Windows?

[Cristian Adam]

On 17-Aug-23 17:08, Haowei Hsu wrote:
> Hello, Alexandru.
>
> I have already installed LLVM on my Windows computer using the 
> LLVM-xxx-win64.exe 
> <https://github.com/llvm/llvm-project/releases/tag/llvmorg-16.0.6>
> installer downloaded from LLVM's GitHub. From the installation 
> results, it does indeed
> contain *libclang.dll* and *libclang.lib*.
>
> image.png
>
> I have also set the *LLVM_INSTALL_DIR* environment variable to its 
> top-level installation
> directory *"C:\Program Files\LLVM"*. However, from the warning message 
> when running
> configure.bat, it seems that libclang still cannot be found.
>

Hi,

Alexandru pointed out to 
https://download.qt.io/development_releases/prebuilt/libclang/qt/ which 
contains a static build of LLVM libraries,
but it also installs the CMake package files.

Qt is using CMake's find_package mechanism to find installed software. 
Setting LLVM_INSTALL_DIR doesn't do much because the official LLVM 
packages do not install  the CMake package files under "c:\Program 
Files\LLVM\lib\cmake".

This is why configure fails.

Supporting LLVM_INSTALL_DIR is giving the false impression that things 
will work with any LLVM installation, having specified the LLVM 
installation via CMAKE_PREFIX_PATH like one would do for Qt, would 
suggest that CMake installation packages are needed.

I've opened up LLVM/Clang Windows installer doesn't provide CMake 
package information · Issue #47222 · llvm/llvm-project (github.com) 
<https://github.com/llvm/llvm-project/issues/47222> but it was closed as 
WONTFIX.

I think we should put a DO NOT USE LLVM INSTALLER FROM Download LLVM 
releases <https://releases.llvm.org/> on WINDOWS !!!

Cheers,
Cristian.
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