From 2fd7ffa81bac88bed9fdafee855fb113db9ef5e4 Mon Sep 17 00:00:00 2001
From: Gilles Peskine <Gilles.Peskine@arm.com>
Date: Wed, 4 Sep 2019 22:10:34 +0200
Subject: [PATCH] cmake: fix Python requirement

Perl is no longer needed.

Python must be version 3. Version 2 is not suitable.

The variable is PYTHONINTERP_FOUND, not PYTHON_FOUND.
---
 CMakeLists.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7f2b502e7..4350d4e28 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,9 +51,9 @@ set(CTR_DRBG_128_BIT_KEY_WARNING "${WARNING_BORDER}"
                          "${CTR_DRBG_128_BIT_KEY_WARN_L3}"
                          "${WARNING_BORDER}")
 
-find_package(PythonInterp)
-find_package(Perl)
-if(PYTHON_FOUND)
+# Python 3 is only needed here to check for configuration warnings.
+find_package(PythonInterp 3)
+if(PYTHONINTERP_FOUND)
 
     # If 128-bit keys are configured for CTR_DRBG, display an appropriate warning
     execute_process(COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/scripts/config.py -f ${CMAKE_CURRENT_SOURCE_DIR}/include/mbedtls/config.h get MBEDTLS_CTR_DRBG_USE_128_BIT_KEY