From 88d2241e0947355e3fc99fefb34e13904f0ee57b Mon Sep 17 00:00:00 2001
From: Carles Fernandez <carles.fernandez@gmail.com>
Date: Fri, 27 Jul 2018 10:11:22 +0200
Subject: [PATCH 1/2] Fix for Python3

---
 cmake/Modules/SetupPython.cmake | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/cmake/Modules/SetupPython.cmake b/cmake/Modules/SetupPython.cmake
index d5c799a9f..01fc9a512 100644
--- a/cmake/Modules/SetupPython.cmake
+++ b/cmake/Modules/SetupPython.cmake
@@ -24,13 +24,18 @@
 
 if (PYTHON_EXECUTABLE)
     message(STATUS "User set python executable ${PYTHON_EXECUTABLE}")
-    find_package(PythonInterp ${GNSSSDR_PYTHON_MIN_VERSION} REQUIRED)
+    string(FIND "${PYTHON_EXECUTABLE}" "python3" IS_PYTHON3)
+    if(IS_PYTHON3 EQUAL -1)
+        find_package(PythonInterp ${GNSSSDR_PYTHON_MIN_VERSION} REQUIRED)
+    else(IS_PYTHON3 EQUAL -1)
+        find_package(PythonInterp ${GNSSSDR_PYTHON3_MIN_VERSION} REQUIRED)
+    endif(IS_PYTHON3 EQUAL -1)
 else (PYTHON_EXECUTABLE)
     message(STATUS "PYTHON_EXECUTABLE not set - using default python2")
+    message(STATUS "Use -DPYTHON_EXECUTABLE=/path/to/python3 to build for python3.")
     find_package(PythonInterp ${GNSSSDR_PYTHON_MIN_VERSION})
     if(NOT PYTHONINTERP_FOUND)
-        # message(STATUS "Use -DPYTHON_EXECUTABLE=/path/to/python2 to build for python2.")
-        message(STATUS "python2 not found - using python3")
+        message(STATUS "python2 not found - trying with python3")
         find_package(PythonInterp ${GNSSSDR_PYTHON3_MIN_VERSION} REQUIRED)
      endif(NOT PYTHONINTERP_FOUND)
 endif (PYTHON_EXECUTABLE)

From 1e01bc623b70fd3d513e245ff528eb146d736c9d Mon Sep 17 00:00:00 2001
From: Carles Fernandez <carles.fernandez@gmail.com>
Date: Fri, 27 Jul 2018 10:38:32 +0200
Subject: [PATCH 2/2] Suggest the right package dependencies for Mako and six
 modules if python3 is found but the modules are missing

---
 CMakeLists.txt | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4932c448d..da6f04331 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -567,25 +567,31 @@ if(NOT VOLK_GNSSSDR_FOUND)
     ###############################
     # Find Python required modules
     ###############################
-    include(SetupPython) #sets PYTHON_EXECUTABLE and PYTHON_DASH_B
+    include(SetupPython) # sets PYTHON_EXECUTABLE and search for required modules
     GNSSSDR_PYTHON_CHECK_MODULE("python >= ${GNSSSDR_PYTHON_MIN_VERSION}" sys "sys.version.split()[0] >= '${GNSSSDR_PYTHON_MIN_VERSION}'" PYTHON_MIN_VER_FOUND)
     GNSSSDR_PYTHON_CHECK_MODULE("mako >= ${GNSSSDR_MAKO_MIN_VERSION}" mako "mako.__version__ >= '${GNSSSDR_MAKO_MIN_VERSION}'" MAKO_FOUND)
     GNSSSDR_PYTHON_CHECK_MODULE("six - python 2 and 3 compatibility library" six "True" SIX_FOUND)
 
     if(NOT PYTHON_MIN_VER_FOUND)
         message(FATAL_ERROR "Python ${GNSSSDR_PYTHON_MIN_VERSION} or greater required to build VOLK_GNSSSDR")
-    endif()
+    endif(NOT PYTHON_MIN_VER_FOUND)
+
+    if(${PYTHON3})
+        set(PYTHON_NAME "python3")
+    else(${PYTHON3})
+        set(PYTHON_NAME "python")
+    endif(${PYTHON3})
 
     #  Mako
     if(NOT MAKO_FOUND)
-        message(STATUS "Mako templates not found. See http://www.makotemplates.org/ ")
+        message(STATUS "Mako template library not found. See http://www.makotemplates.org/ ")
         message(STATUS " You can try to install it by typing:")
         if(${LINUX_DISTRIBUTION} MATCHES "Fedora" OR ${LINUX_DISTRIBUTION} MATCHES "Red Hat")
-            message(STATUS " sudo yum install python-mako")
+            message(STATUS " sudo yum install ${PYTHON_NAME}-mako")
         elseif(${LINUX_DISTRIBUTION} MATCHES "openSUSE")
-            message(STATUS " sudo zypper install python-Mako")
+            message(STATUS " sudo zypper install ${PYTHON_NAME}-Mako")
         else(${LINUX_DISTRIBUTION} MATCHES "Fedora" OR ${LINUX_DISTRIBUTION} MATCHES "Red Hat")
-            message(STATUS " sudo apt-get install python-mako")
+            message(STATUS " sudo apt-get install ${PYTHON_NAME}-mako")
         endif(${LINUX_DISTRIBUTION} MATCHES "Fedora" OR ${LINUX_DISTRIBUTION} MATCHES "Red Hat")
         message(FATAL_ERROR "Mako templates required to build VOLK_GNSSSDR")
     endif(NOT MAKO_FOUND)
@@ -595,11 +601,11 @@ if(NOT VOLK_GNSSSDR_FOUND)
         message(STATUS "python-six not found. See https://pythonhosted.org/six/ ")
         message(STATUS " You can try to install it by typing:")
         if(${LINUX_DISTRIBUTION} MATCHES "Fedora" OR ${LINUX_DISTRIBUTION} MATCHES "Red Hat")
-            message(STATUS " sudo yum install python-six")
+            message(STATUS " sudo yum install ${PYTHON_NAME}-six")
         elseif(${LINUX_DISTRIBUTION} MATCHES "openSUSE")
-            message(STATUS " sudo zypper install python-six")
+            message(STATUS " sudo zypper install ${PYTHON_NAME}-six")
         else(${LINUX_DISTRIBUTION} MATCHES "Fedora" OR ${LINUX_DISTRIBUTION} MATCHES "Red Hat")
-            message(STATUS " sudo apt-get install python-six")
+            message(STATUS " sudo apt-get install ${PYTHON_NAME}-six")
         endif(${LINUX_DISTRIBUTION} MATCHES "Fedora" OR ${LINUX_DISTRIBUTION} MATCHES "Red Hat")
         message(FATAL_ERROR "six - python 2 and 3 compatibility library required to build VOLK_GNSSSDR")
     endif(NOT SIX_FOUND)