Hi Hendrik,

This sounds like something that should be discussed on build-dev, rather than jdk-dev.

Short answer to your question: There's no technical reason why it would not be possible to use clang or gcc on Windows. However, the code is full of assumptions that "compiling on Windows" == "compiling using the Microsoft toolchain", and it will certainly take a lot of effort to hunt all these down and fix them properly.

Personally, I don't think it's worth the effort. It's unlikely that the resulting binary will have any significant change in performance (at least not any positive one), and it is likely to continuously break since people will be adding new code with the "windows" == "microsoft toolchain" assumption.

Question: Is the Visual Studio Express (https://www.visualstudio.com/vs/visual-studio-express/) such a hassle to install?


On 2018-03-06 12:17, Hendrik Schreiber wrote:

inspired by the recent news that Chrome ditched the Microsoft C++ compiler and 
replaced it with gcc/clang 
 I’m wondering wether that’s possible and desirable for OpenJDK, too.

 From my point of view: Yes.

Downloading, installing etc. Visual Studio is a major pain for anybody usually 
working on another platform. Whenever I encounter a bug that’s Windows 
specific, I pretty much always give up the idea to create a fix and instead 
just report a bug. It’s just too much of a hassle to create a working build 

So has migrating to gcc/clang for Windows been evaluated? Is it an option at 
all? Would it make things easier or harder? What do you think? Besides ease of 
use, how would such a move affect performance?



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