if NOT "%IncludeSSL%"=="false" set binaries=%binaries% openssl-bin-3.0.18
if NOT "%IncludeTkinter%"=="false" set binaries=%binaries% tcltk-8.6.15.0
if NOT "%IncludeSSLSrc%"=="false" set binaries=%binaries% nasm-2.11.06
-if NOT "%IncludeLLVM%"=="false" set binaries=%binaries% llvm-20.1.8.0
+if NOT "%IncludeLLVM%"=="false" set binaries=%binaries% llvm-21.1.4.0
for %%b in (%binaries%) do (
if exist "%EXTERNALS_DIR%\%%b" (
git clone --depth 1 https://github.com/%ORG%/cpython-bin-deps --branch %%b "%EXTERNALS_DIR%\%%b"
) else (
echo.Fetching %%b...
- if "%%b"=="llvm-20.1.8.0" (
+ if "%%b"=="llvm-21.1.4.0" (
%PYTHON% -E "%PCBUILD%\get_external.py" --release --organization %ORG% --externals-dir "%EXTERNALS_DIR%" %%b
) else (
%PYTHON% -E "%PCBUILD%\get_external.py" --binary --organization %ORG% --externals-dir "%EXTERNALS_DIR%" %%b
The JIT compiler does not require end users to install any third-party dependencies, but part of it must be *built* using LLVM[^why-llvm]. You are *not* required to build the rest of CPython using LLVM, or even the same version of LLVM (in fact, this is uncommon).
-LLVM version 20 is the officially supported version. You can modify if needed using the `LLVM_VERSION` env var during configure. Both `clang` and `llvm-readobj` need to be installed and discoverable (version suffixes, like `clang-19`, are okay). It's highly recommended that you also have `llvm-objdump` available, since this allows the build script to dump human-readable assembly for the generated code.
+LLVM version 21 is the officially supported version. You can modify if needed using the `LLVM_VERSION` env var during configure. Both `clang` and `llvm-readobj` need to be installed and discoverable (version suffixes, like `clang-19`, are okay). It's highly recommended that you also have `llvm-objdump` available, since this allows the build script to dump human-readable assembly for the generated code.
It's easy to install all of the required tools:
### Linux
-Install LLVM 20 on Ubuntu/Debian:
+Install LLVM 21 on Ubuntu/Debian:
```sh
wget https://apt.llvm.org/llvm.sh
chmod +x llvm.sh
-sudo ./llvm.sh 20
+sudo ./llvm.sh 21
```
-Install LLVM 20 on Fedora Linux 40 or newer:
+Install LLVM 21 on Fedora Linux 40 or newer:
```sh
-sudo dnf install 'clang(major) = 20' 'llvm(major) = 20'
+sudo dnf install 'clang(major) = 21' 'llvm(major) = 21'
```
### macOS
-Install LLVM 20 with [Homebrew](https://brew.sh):
+Install LLVM 21 with [Homebrew](https://brew.sh):
```sh
-brew install llvm@20
+brew install llvm@21
```
Homebrew won't add any of the tools to your `$PATH`. That's okay; the build script knows how to find them.
LLVM is downloaded automatically (along with other external binary dependencies) by `PCbuild\build.bat`.
-Otherwise, you can install LLVM 20 [by searching for it on LLVM's GitHub releases page](https://github.com/llvm/llvm-project/releases?q=20), clicking on "Assets", downloading the appropriate Windows installer for your platform (likely the file ending with `-win64.exe`), and running it. **When installing, be sure to select the option labeled "Add LLVM to the system PATH".**
+Otherwise, you can install LLVM 21 [by searching for it on LLVM's GitHub releases page](https://github.com/llvm/llvm-project/releases?q=21), clicking on "Assets", downloading the appropriate Windows installer for your platform (likely the file ending with `-win64.exe`), and running it. **When installing, be sure to select the option labeled "Add LLVM to the system PATH".**
Alternatively, you can use [chocolatey](https://chocolatey.org):
```sh
-choco install llvm --version=20.1.8
+choco install llvm --version=21.1.0
```
### Dev Containers
If you are working on CPython in a [Codespaces instance](https://devguide.python.org/getting-started/setup-building/#using-codespaces), there's no
-need to install LLVM as the Fedora 42 base image includes LLVM 20 out of the box.
+need to install LLVM as the Fedora 43 base image includes LLVM 21 out of the box.
## Building
projects / thirdparty / Python / cpython.git / commitdiff
