[llvm-dev] difference with autotools, cmake and ninja building methods

[Chris Bieneman via llvm-dev]

> On Nov 29, 2015, at 9:09 PM, 慕冬亮 <mudongliangabcd at gmail.com> wrote:
> 
> 2015-11-30 12:58 GMT+08:00 Chris Bieneman <beanz at apple.com <mailto:beanz at apple.com>>:
>> The autotools build system is officially deprecated and will be removed in a
>> future release.
>> 
>> CMake is the recommended configuration system, but it is only a
>> configuration system. It generates build files for multiple different build
>> systems. One of the most popular build systems is Ninja. You cannot build
>> LLVM with Ninja without using CMake, but CMake doesn’t require Ninja. You
>> can use CMake to generate Makefiles as well as Xcode and Visual Studio
>> projects, and more.
>> 
> I often used cmake to compile llvm and clang. But I found a boring
> problem: when I update all the repositories - llvm,clang,compiler-rt
> and try to recompile, but I can't compile source code successfully

Do you mean when you update the repositories you can’t compile llvm, clang, and compiler-rt? Do you have a specific error? Keep in mind the llvm, clang, and compiler-rt repositories need to be kept in sync. You can’t update one without updating them all.

> and
> it takes me much time to recompile.

The clang compiler is a quite large source project, depending on your hardware it may take a while to compile. Ninja is better than any other tool that I’m aware of at minimizing the work required during incremental builds.

-Chris

> Does anyone has advice about this
> problem?
>> This page has the LLVM project’s documentation on using CMake:
>> http://llvm.org/docs/CMake.html
>> 
>> -Chris
>> ile.
>> On Nov 29, 2015, at 7:52 PM, 慕冬亮 via llvm-dev <llvm-dev at lists.llvm.org>
>> wrote:
>> 
>>   When I see one book about llvm and choose the building method
>> between autotools, cmake, and ninja building methods, I was confused.
>> Is there any link about this content?
>>   Thanks for reply.
>> 
>> --
>> My best regards to you.
>> 
>>    No System Is Safe!
>>    mudongliang
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> 
>> 
> 
> 
> 
> -- 
> My best regards to you.
> 
>     No System Is Safe!
>     mudongliang

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