ci: update travis to also Python 3 correctly

.travis.yml

@@ -20,28 +20,44 @@ env:
 jobs:
   include:
     - dist: bionic
-      env: BUILDTYPE=Release
+      env: 
+        - BUILDTYPE=Release
+        - TRAVIS_PYTHON_VERSION=27 
       python: 2.7
     - dist: bionic
-      env: BUILDTYPE=Release
+      env: 
+        - BUILDTYPE=Release
+        - TRAVIS_PYTHON_VERSION=36
       python: 3.6
     - dist: bionic
-      env: BUILDTYPE=Debug
+      env: 
+        - BUILDTYPE=Debug
+        - TRAVIS_PYTHON_VERSION=27 
       python: 2.7
     - dist: bionic
-      env: BUILDTYPE=Debug
+      env: 
+        - BUILDTYPE=Debug
+        - TRAVIS_PYTHON_VERSION=36
       python: 3.6
     - dist: xenial
-      env: BUILDTYPE=Release
+      env: 
+        - BUILDTYPE=Release
+        - TRAVIS_PYTHON_VERSION=27 
       python: 2.7
     - dist: xenial
-      env: BUILDTYPE=Release
+      env: 
+        - BUILDTYPE=Release
+        - TRAVIS_PYTHON_VERSION=35 
       python: 3.5
     - dist: trusty 
-      env: BUILDTYPE=Release
+      env: 
+        - BUILDTYPE=Release
+        - TRAVIS_PYTHON_VERSION=27 
       python: 2.7
     - dist: trusty 
-      env: BUILDTYPE=Release
+      env: 
+        - BUILDTYPE=Release
+        - TRAVIS_PYTHON_VERSION=34
       python: 3.4
 
 notifications:

travis_custom/custom_build

@@ -2,13 +2,17 @@
 set -e
 
 # Setup environment variables.
-export CMAKE_ADDITIONAL_OPTIONS=" ${CMAKE_ADDITIONAL_OPTIONS} -DBUILD_BENCHMARK=\"ON\" -DBUILD_UNIT_TESTS=\"ON\" -DCMAKE_CXX_FLAGS=-DBOOST_SYSTEM_NO_DEPRECATED -DPYTHON_EXECUTABLE=$(which python)"
+export CMAKE_ADDITIONAL_OPTIONS=" ${CMAKE_ADDITIONAL_OPTIONS} -DBUILD_BENCHMARK=\"ON\" -DBUILD_UNIT_TESTS=\"ON\" -DCMAKE_CXX_FLAGS=-DBOOST_SYSTEM_NO_DEPRECATED"
 if [[ ";${DO_INSTALL_DOC_EXCEPT_ON_BRANCH};" == *";${CI_BRANCH};"* ]]; then
   export CMAKE_ADDITIONAL_OPTIONS=" ${CMAKE_ADDITIONAL_OPTIONS} -DINSTALL_DOCUMENTATION=\"OFF\""
 else
   export CMAKE_ADDITIONAL_OPTIONS=" ${CMAKE_ADDITIONAL_OPTIONS} -DINSTALL_DOCUMENTATION=\"ON\""
 fi
 
+if [[ $TRAVIS_PYTHON_VERSION -gt 30 ]]; then
+  export CMAKE_ADDITIONAL_OPTIONS=" ${CMAKE_ADDITIONAL_OPTIONS} -DPYTHON_EXECUTABLE=$(which python3)"
+fi
+
 # Setup environment variables.
 . ./.travis/run ../.travis/build