use Python version provided by platform in CI / prefer python3 (#3776)

.github/workflows/CI-unixish.yml

@@ -17,11 +17,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: Set up Python 3.10
-        uses: actions/setup-python@v2
-        with:
-          python-version: '3.10'
-
       - name: Install missing software on ubuntu
         if: contains(matrix.os, 'ubuntu')
         run: |
@@ -38,12 +33,12 @@ jobs:
       - name: Install missing software on macos
         if: contains(matrix.os, 'macos')
         run: |
-          brew install coreutils z3 qt@5
+          brew install coreutils python3 z3 qt@5
 
       - name: Install missing Python packages
         run: |
-          python -m pip install pip --upgrade
-          python -m pip install pytest
+          python3 -m pip install pip --upgrade
+          python3 -m pip install pytest
 
       - name: CMake build on ubuntu (with GUI / system tinyxml2)
         if: contains(matrix.os, 'ubuntu')
@@ -119,11 +114,11 @@ jobs:
       - name: Run test/cli
         run: |
           cd test/cli
-          pytest test-*.py
+          python3 -m pytest test-*.py
           cd ../../..
           ln -s cppcheck 'cpp check'
           cd 'cpp check/test/cli'
-          pytest test-*.py
+          python3 -m pytest test-*.py
 
       # fails on macos since some includes (e.g. sys/epoll.h) are not available
       - name: Run cfg tests

Makefile

@@ -20,9 +20,9 @@ ifeq ($(SRCDIR),build)
 endif
 ifeq ($(MATCHCOMPILER),yes)
     # Find available Python interpreter
-    PYTHON_INTERPRETER := $(shell which python)
-    ifndef PYTHON_INTERPRETER
     PYTHON_INTERPRETER := $(shell which python3)
+    ifndef PYTHON_INTERPRETER
+        PYTHON_INTERPRETER := $(shell which python)
     endif
     ifndef PYTHON_INTERPRETER
         $(error Did not find a Python interpreter)

cmake/findDependencies.cmake

@@ -34,11 +34,15 @@ endif()
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 if (NOT USE_MATCHCOMPILER_OPT MATCHES "Off")
-    find_package(PythonInterp)
-    if (NOT ${PYTHONINTERP_FOUND})
+    find_package(PythonInterp 3 QUIET)
+    if (NOT PYTHONINTERP_FOUND)
+        set(PYTHONINTERP_FOUND "")
+        find_package(PythonInterp 2.7 QUIET)
+        if (NOT PYTHONINTERP_FOUND)
             message(WARNING "No python interpreter found. Therefore, the match compiler is switched off.")
             set(USE_MATCHCOMPILER_OPT "Off")
         endif()
+    endif()
 endif()
 
 if (NOT USE_BUNDLED_TINYXML2)
@@ -48,7 +52,6 @@ if (NOT USE_BUNDLED_TINYXML2)
         if (NOT tinyxml2_LIBRARY)
             message(FATAL_ERROR "tinyxml2 has not been found")
         else()
-            message(STATUS "tinyxml2_LIBRARY: ${tinyxml2_LIBRARY}")
             set(tinyxml2_FOUND 1)
         endif()
     endif()

cmake/printInfo.cmake

@@ -47,12 +47,20 @@ if (HAVE_RULES)
     message( STATUS "PCRE_LIBRARY =          ${PCRE_LIBRARY}" )
 endif()
 message( STATUS )
+if (NOT USE_MATCHCOMPILER_OPT MATCHES "Off")
+    message( STATUS "PYTHON_VERSION_STRING = ${PYTHON_VERSION_STRING}" )
+    message( STATUS "PYTHON_EXECUTABLE =     ${PYTHON_EXECUTABLE}" )
+endif()
+message( STATUS )
 message( STATUS "USE_Z3 =                ${USE_Z3}" )
 if (USE_Z3)
     message( STATUS "Z3_LIBRARIES =          ${Z3_LIBRARIES}" )
     message( STATUS "Z3_CXX_INCLUDE_DIRS =   ${Z3_CXX_INCLUDE_DIRS}" )
 endif()
 message( STATUS "USE_BUNDLED_TINYXML2 =  ${USE_BUNDLED_TINYXML2}" )
+if (NOT USE_BUNDLED_TINYXML2)
+    message(STATUS "tinyxml2_LIBRARY =       ${tinyxml2_LIBRARY}")
+endif()
 message( STATUS )
 
 if(${ANALYZE_ADDRESS})

tools/dmake.cpp

@@ -254,9 +254,9 @@ int main(int argc, char **argv)
          << "endif\n";
     fout << "ifeq ($(MATCHCOMPILER),yes)\n"
          << "    # Find available Python interpreter\n"
-         << "    PYTHON_INTERPRETER := $(shell which python)\n"
-         << "    ifndef PYTHON_INTERPRETER\n"
          << "    PYTHON_INTERPRETER := $(shell which python3)\n"
+         << "    ifndef PYTHON_INTERPRETER\n"
+         << "        PYTHON_INTERPRETER := $(shell which python)\n"
          << "    endif\n"
          << "    ifndef PYTHON_INTERPRETER\n"
          << "        $(error Did not find a Python interpreter)\n"