CMake: consolidate Python checks

This essentially removes the conditional check, when an unconditional check was
already being performed later.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f49cf246d86df0484a3f7da45d1c68e13e01822b..0d5b21f431b2832de84b58d2008de56f8acd8916 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -157,13 +157,13 @@ if(${CMAKE_VERSION} VERSION_LESS "3.12.0")
 else()
   find_package(Python3 COMPONENTS Interpreter)
 endif()
+if(NOT Python3_EXECUTABLE)
+  message(FATAL_ERROR "Python 3 not found")
+endif()
 
 if(DEFINED VERSION)
   set(GRAPHVIZ_VERSION_STRING "${VERSION}")
 else()
-  if(NOT Python3_EXECUTABLE)
-    message(FATAL_ERROR "Python 3 not found")
-  endif()
   execute_process(
     COMMAND           ${Python3_EXECUTABLE} gen_version.py
     WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
@@ -178,9 +178,6 @@ else()
   endif()
 endif()
 
-if(NOT Python3_EXECUTABLE)
-  message(FATAL_ERROR "Python 3 not found")
-endif()
 # Set GRAPHVIZ_VERSION_BUILD to time of last commit, or to 0 if that fails.
 execute_process(
   COMMAND           ${Python3_EXECUTABLE} gen_version.py --committer-date-graphviz