[PATCH] D136906: [Clang][LoongArch] Implement __builtin_loongarch_dbar builtin

[Gong LingQin via Phabricator via cfe-commits]

gonglingqin added a comment.

In D136906#3940427 <https://reviews.llvm.org/D136906#3940427>, @WowbaggersLiquidLunch wrote:

>> I get the following error:
>>
>>> CMake Error: Could not create named generator Xcode
>
> Sorry, I forgot to mention that Xcode is only available on macOS.
>
>> But when I change Xcode to Ninja, no error output is generated.
>
> Indeed. Ninja works fine for me as well. The problem is I kind of need both Xcode and Ninja in my workflow (Xcode for editing, Ninja for building).
>
>> Do you have any suggestions for reproducing the bugs you mentioned?
>
> I think the following steps should be able to reproduce the error messages I'm seeing (It's a bit long):
>
> 1. Install macOS 12.6 or newer. (I'm currently on 12.6, but newer versions such as 12.6.1 and 13 (the latest) should produce the same error messages.)
>
> 2. Install Xcode 14.1 and/or the Xcode command line tools
>   - Xcode can be installed via this link <https://developer.apple.com/services-account/download?path=/Developer_Tools/Xcode_14.1/Xcode_14.1.xip> (generally recommended), or from the Mac App Store via this link <https://apps.apple.com/us/app/xcode/id497799835?mt=12>.
>     - The first link downloads a `.xip` file which can take a long time to decompress. This step can be sped up significantly by decompressing the file using this tool <https://github.com/saagarjha/unxip>.
>   - The command line tools can be installed via this link <https://download.developer.apple.com/Developer_Tools/Command_Line_Tools_for_Xcode_14.1/Command_Line_Tools_for_Xcode_14.1.dmg>, via the following commands, or by launching Xcode after it's installed. (I don't remember it clearly, but I think you probably can skip this step and have Homebrew install it for you in step 3)
>
>     `sudo rm -rf /Library/Developer/CommandLineTools`
>
>     `sudo xcode-select --install`
>
> 3. Install LLVM's dependencies <https://llvm.org/docs/GettingStarted.html#software> via Homebrew
>   - First we need to install brew <https://brew.sh> using the following command
>
>     `/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"`
>   - Then install Cmake and Python with `brew`. (I'm not sure if Python is really needed)
>
>     `brew install cmake python`
>
> 4. Clone LLVM and create the build directory.
> 5. Generate Xcode project using CMake.
>
>   `cmake -G "Xcode" -DCMAKE_BUILD_TYPE=Debug -DLLVM_TARGETS_TO_BUILD="X86" -DLLVM_ENABLE_PROJECTS="clang" -DLLVM_OPTIMIZED_TABLEGEN=ON -DLLVM_ENABLE_IDE=ON -DLLVM_CCACHE_BUILD=ON path/to/llvm`
>
>   Flags other than `-G "Xcode"` probably are optional for the purpose of reproducing the error messages.

Thanks! Very nice to know.


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