[llvm] [python] Bump Python minimum version to 3.8 (PR #78828)

[Craig Hesling via llvm-commits]

https://github.com/linux4life798 created https://github.com/llvm/llvm-project/pull/78828

As per the RFC https://discourse.llvm.org/t/rfc-upgrading-llvms-minimum-required-python-version/67571,
raise the minimum Python version to ensure that the Python syntax doesn't
become overly obsolete, to enable new Python feature usage, and ensure the
maintainability of CI.

One of the primary use cases for this higher Python version is to enable python type
annotations that are more aligned with current Python best practices. This is not only
important for our own internal Python for testing, but for the Python bindings that
are exposed to users.

>From 70d5ed3ab20aa1771325e2aacb6f38f0e1d7ffa4 Mon Sep 17 00:00:00 2001
From: Craig Hesling <craig at hesling.com>
Date: Fri, 19 Jan 2024 18:22:02 -0800
Subject: [PATCH 1/2] [python] Bump Python minimum version to 3.7

As per the RFC
https://discourse.llvm.org/t/rfc-upgrading-llvms-minimum-required-python-version/67571,
raise the minimum Python version to ensure that the Python syntax doesn't
become overly obsolete, to enable new Python feature usage, and ensure the
maintainability of CI.
---
 llvm/CMakeLists.txt          | 4 ++--
 llvm/docs/GettingStarted.rst | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index 1d230004e6c34ec..9ae6ac819de83f9 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -880,8 +880,8 @@ set(LLVM_PROFDATA_FILE "" CACHE FILEPATH
   "Profiling data file to use when compiling in order to improve runtime performance.")
 
 if(LLVM_INCLUDE_TESTS)
-  # Lit test suite requires at least python 3.6
-  set(LLVM_MINIMUM_PYTHON_VERSION 3.6)
+  # All LLVM Python files should be compatible down to this minimum version.
+  set(LLVM_MINIMUM_PYTHON_VERSION 3.7)
 else()
   # FIXME: it is unknown if this is the actual minimum bound
   set(LLVM_MINIMUM_PYTHON_VERSION 3.0)
diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
index da9cc8aea6d32d8..3dc4c131b85d7be 100644
--- a/llvm/docs/GettingStarted.rst
+++ b/llvm/docs/GettingStarted.rst
@@ -286,7 +286,7 @@ uses the package and provides other details.
 Package                                                     Version      Notes
 =========================================================== ============ ==========================================
 `CMake <http://cmake.org/>`__                               >=3.20.0     Makefile/workspace generator
-`python <http://www.python.org/>`_                          >=3.6        Automated test suite\ :sup:`1`
+`python <http://www.python.org/>`_                          >=3.7        Automated test suite\ :sup:`1`
 `zlib <http://zlib.net>`_                                   >=1.2.3.4    Compression library\ :sup:`2`
 `GNU Make <http://savannah.gnu.org/projects/make>`_         3.79, 3.79.1 Makefile/build processor\ :sup:`3`
 =========================================================== ============ ==========================================
@@ -294,7 +294,7 @@ Package                                                     Version      Notes
 .. note::
 
    #. Only needed if you want to run the automated test suite in the
-      ``llvm/test`` directory.
+      ``llvm/test`` directory or the libclang Python binding unit tests.
    #. Optional, adds compression / uncompression capabilities to selected LLVM
       tools.
    #. Optional, you can use any other build tool supported by CMake.

>From 6e876a771359dc7eadde1301ae9ddeb241935183 Mon Sep 17 00:00:00 2001
From: Craig Hesling <craig at hesling.com>
Date: Fri, 19 Jan 2024 18:22:41 -0800
Subject: [PATCH 2/2] [python] Bump Python minimum version to 3.8

As per the RFC
https://discourse.llvm.org/t/rfc-upgrading-llvms-minimum-required-python-version/67571,
raise the minimum Python version to ensure that the Python syntax doesn't
become overly obsolete, to enable new Python feature usage, and ensure the
maintainability of CI.
---
 llvm/CMakeLists.txt          | 2 +-
 llvm/docs/GettingStarted.rst | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index 9ae6ac819de83f9..c7c21971039eec7 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -881,7 +881,7 @@ set(LLVM_PROFDATA_FILE "" CACHE FILEPATH
 
 if(LLVM_INCLUDE_TESTS)
   # All LLVM Python files should be compatible down to this minimum version.
-  set(LLVM_MINIMUM_PYTHON_VERSION 3.7)
+  set(LLVM_MINIMUM_PYTHON_VERSION 3.8)
 else()
   # FIXME: it is unknown if this is the actual minimum bound
   set(LLVM_MINIMUM_PYTHON_VERSION 3.0)
diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
index 3dc4c131b85d7be..cb695e1a0b44bfa 100644
--- a/llvm/docs/GettingStarted.rst
+++ b/llvm/docs/GettingStarted.rst
@@ -286,7 +286,7 @@ uses the package and provides other details.
 Package                                                     Version      Notes
 =========================================================== ============ ==========================================
 `CMake <http://cmake.org/>`__                               >=3.20.0     Makefile/workspace generator
-`python <http://www.python.org/>`_                          >=3.7        Automated test suite\ :sup:`1`
+`python <http://www.python.org/>`_                          >=3.8        Automated test suite\ :sup:`1`
 `zlib <http://zlib.net>`_                                   >=1.2.3.4    Compression library\ :sup:`2`
 `GNU Make <http://savannah.gnu.org/projects/make>`_         3.79, 3.79.1 Makefile/build processor\ :sup:`3`
 =========================================================== ============ ==========================================