first time meet llvm

NOTE: PLEASE USE SSD！！！！！

NOTE: PLEASE USE SSD！！！！！

NOTE: PLEASE USE SSD！！！！！

Before start:

To build llvm, we use:

• Windows 10
• visual studio 2019
• a more than 200GB free space SSD

And MSVC uses system code page identifiers to encode source, while llvm source is saved with encodeing UTF-8. If they do not match, it will have some errors while compiling. We can set UTF-8 as default character encoding in windows:

• open control panel, Region->Administrative->Change system locale
• check off "Bate: Use Unicode UTF-8 for worldwide language support"

Get llvm:

git clone https://github.com/llvm/llvm-project.git

cd llvm-project

mkdir build

cd build

Generate Visual Studio solution:

cmake -G "Visual Studio 16 2019" -A x64 -DLLVM_ENABLE_PROJECTS='clang; clang-tools-extra; libcxx; libcxxabi; libunwind; lldb; compiler-rt; lld; polly; debuginfo-tests' ../llvm

then open LLVM.sln and build the solution.

Tips:

1. You can set Options -> Projects and Solutions -> Build and run -> maximum number of parallel project builds to half of you processes to limit memory using;
2. After you run the building, you can go to bed and sleep;