From f16ee492e0a4cff5b83649f72a54af49054a2b37 Mon Sep 17 00:00:00 2001
From: Mathias Preiner <mathias.preiner@gmail.com>
Date: Sat, 22 Sep 2018 02:02:01 -0700
Subject: cmake: Add python3 option.

---
 CMakeLists.txt                     | 5 ++++-
 configure.sh                       | 9 ++++++++-
 src/bindings/python/CMakeLists.txt | 2 +-
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ad6adf2e0..b097a70d7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,6 +79,7 @@ option(USE_CRYPTOMINISAT "Use CryptoMiniSat SAT solver")
 option(USE_LFSC          "Use LFSC proof checker")
 option(USE_SYMFPU        "Use SymFPU for floating point support")
 option(USE_PYTHON2       "Prefer using Python 2 (for Python bindings)")
+option(USE_PYTHON3       "Prefer using Python 3 (for Python bindings)")
 
 # Custom install directories for dependencies
 # If no directory is provided by the user, we first check if the dependency was
@@ -217,8 +218,9 @@ enable_testing()
 
 if(USE_PYTHON2)
   find_package(PythonInterp 2.7 REQUIRED)
+elseif(USE_PYTHON3)
+  find_package(PythonInterp 3 REQUIRED)
 else()
-  find_package(PythonInterp 3)
   find_package(PythonInterp REQUIRED)
 endif()
 
@@ -459,6 +461,7 @@ print_config("Shared libs          :" ENABLE_SHARED)
 print_config("Java bindings        :" BUILD_BINDINGS_JAVA)
 print_config("Python bindings      :" BUILD_BINDINGS_PYTHON)
 print_config("Python2              :" USE_PYTHON2)
+print_config("Python3              :" USE_PYTHON3)
 message("")
 print_config("Portfolio            :" ENABLE_PORTFOLIO)
 message("")
diff --git a/configure.sh b/configure.sh
index f3ba57c82..b92c48ad4 100755
--- a/configure.sh
+++ b/configure.sh
@@ -38,7 +38,8 @@ The following flags enable optional features (disable with --no-<option name>).
   --coverage               support for gcov coverage testing
   --profiling              support for gprof profiling
   --unit-testing           support for unit testing
-  --python2                prefer using Python 2 (for Python bindings)
+  --python2                prefer using Python 2 (also for Python bindings)
+  --python3                prefer using Python 3 (also for Python bindings)
 
 The following options configure parameterized features.
 
@@ -125,6 +126,7 @@ symfpu=default
 tracing=default
 unit_testing=default
 python2=default
+python3=default
 valgrind=default
 profiling=default
 readline=default
@@ -241,6 +243,9 @@ do
     --python2) python2=ON;;
     --no-python2) python2=OFF;;
 
+    --python3) python3=ON;;
+    --no-python3) python3=OFF;;
+
     --valgrind) valgrind=ON;;
     --no-valgrind) valgrind=OFF;;
 
@@ -350,6 +355,8 @@ cmake_opts=""
   && cmake_opts="$cmake_opts -DENABLE_UNIT_TESTING=$unit_testing"
 [ $python2 != default ] \
   && cmake_opts="$cmake_opts -DUSE_PYTHON2=$python2"
+[ $python3 != default ] \
+  && cmake_opts="$cmake_opts -DUSE_PYTHON3=$python3"
 [ $valgrind != default ] \
   && cmake_opts="$cmake_opts -DENABLE_VALGRIND=$valgrind"
 [ $profiling != default ] \
diff --git a/src/bindings/python/CMakeLists.txt b/src/bindings/python/CMakeLists.txt
index 44d64fb29..d03924680 100644
--- a/src/bindings/python/CMakeLists.txt
+++ b/src/bindings/python/CMakeLists.txt
@@ -1,6 +1,6 @@
 # Make sure that interpreter and libraries have a compatible version.
 # Note: We use the Python interpreter to determine the install path for Python
-# modules.  If the interpreter and library have different version, the module
+# modules.  If the interpreter and library have different versions, the module
 # will be installed for the wrong Python version. Hence, we require the library
 # version to match the Python interpreter's version.
 find_package(PythonLibs
-- 
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