From d6f5a0445813f2d934c2031522015ca2830976fe Mon Sep 17 00:00:00 2001
From: Andre Sailer <andre.philippe.sailer@cern.ch>
Date: Tue, 3 Nov 2020 10:52:11 +0100
Subject: [PATCH] CMAKE: fix python finding for older cmakes
---
cmake/DD4hepBuild.cmake | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/cmake/DD4hepBuild.cmake b/cmake/DD4hepBuild.cmake
index 342fc13d3..22df262af 100644
--- a/cmake/DD4hepBuild.cmake
+++ b/cmake/DD4hepBuild.cmake
@@ -651,8 +651,15 @@ macro(DD4HEP_SETUP_ROOT_TARGETS)
#Check if Python version detected matches the version used to build ROOT
SET(Python_FIND_FRAMEWORK LAST)
IF((TARGET ROOT::PyROOT OR TARGET ROOT::ROOTTPython) AND ${ROOT_VERSION} VERSION_GREATER_EQUAL 6.19)
- dd4hep_debug( "D++> Python version used for building ROOT ${ROOT_PYTHON_VERSION}" )
- FIND_PACKAGE(Python ${ROOT_PYTHON_VERSION} EXACT REQUIRED COMPONENTS Development)
+ # cmake 3.17.1 doesn't include python patch level in PYTHON_VERSION
+ IF(CMAKE_VERSION VERSION_EQUAL 3.17.1)
+ string(REGEX MATCH [23]\.[0-9]+ REQUIRE_PYTHON_VERSION ${ROOT_PYTHON_VERSION})
+ ELSE()
+ SET(REQUIRE_PYTHON_VERSION ${ROOT_PYTHON_VERSION})
+ ENDIF()
+ dd4hep_debug("D++> Python version used for building ROOT ${ROOT_PYTHON_VERSION}" )
+ dd4hep_debug("D++> Required python version ${REQUIRE_PYTHON_VERSION}")
+ FIND_PACKAGE(Python ${REQUIRE_PYTHON_VERSION} EXACT REQUIRED COMPONENTS Development)
ELSE()
FIND_PACKAGE(Python COMPONENTS Development)
ENDIF()
--
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