From 07444e4e38ca32080d620219504dc3855ea3de6c Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Sat, 24 Apr 2021 17:35:17 -0700
Subject: [PATCH] build: use `find_package(Python3)`

This bumps the CMake minimum version to 3.12 to enable the use of
FindPython3.  This allows the replacement of the `python3` with a
CMake variable defined by the module.  This avoids the additional
handling for python being renamed to python3.

This partially resolves #2049.
---
 CMakeLists.txt | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e1c91108d1..50e2ee7422 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
+cmake_minimum_required (VERSION 3.12 FATAL_ERROR)
 project (Graphviz)
 
 include(FeatureSummary)
@@ -105,11 +105,13 @@ endif()
 
 # ============================ Set Graphviz version ============================
 
+find_package(Python3 COMPONENTS Interpreter REQUIRED)
+
 if (DEFINED VERSION)
     set(GRAPHVIZ_VERSION_STRING "${VERSION}")
 else()
     execute_process(
-        COMMAND           python3 gen_version.py
+        COMMAND           "${Python3_EXECUTABLE}" gen_version.py
         WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
         RESULT_VARIABLE   gen_version_result
         OUTPUT_VARIABLE   GRAPHVIZ_VERSION_STRING
@@ -127,7 +129,7 @@ if (DEFINED DATE)
 else()
     # Set GRAPHVIZ_VERSION_BUILD to time of last commit, or to 0 if that fails.
     execute_process(
-        COMMAND           python3 gen_version.py --committer-date-graphviz
+        COMMAND           "${Python3_EXECUTABLE}" gen_version.py --committer-date-graphviz
         WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
         RESULT_VARIABLE   gen_date_result
         OUTPUT_VARIABLE   GRAPHVIZ_VERSION_BUILD
-- 
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