tools: add capability to provide make command via environment

Not all operating systems name the GNU Make `make`. FreeBSD e.g. uses a
different dialect of Make, that seems to be incompatible with GNU make.
(I wasn't able to get `make` run, but `gmake` works).

This allows our test scripts to be configured via the environment
variable `MAKE` to point to a different make command.

dist/pythonlibs/testrunner/spawn.py

@@ -41,13 +41,14 @@ TEST_INTERACTIVE_DELAY = int(os.environ.get('TEST_INTERACTIVE_DELAY') or 1)
 TESTRUNNER_RESET_AFTER_TERM = int(os.environ.get('TESTRUNNER_RESET_AFTER_TERM')
                                   or '0')
 
+MAKE = os.environ.get('MAKE', 'make')
 
 def _reset_board(env):
     if MAKE_RESET_DELAY > 0:
         time.sleep(MAKE_RESET_DELAY)
 
     try:
-        subprocess.check_output(('make', 'reset'), env=env,
+        subprocess.check_output((MAKE, 'reset'), env=env,
                                 stderr=subprocess.PIPE)
     except subprocess.CalledProcessError:
         # make reset yields error on some boards even if successful
@@ -74,7 +75,7 @@ def setup_child(timeout=10, spawnclass=pexpect.spawnu, env=None, logfile=None):
     # the serial terminal. This gives time for stdio to be ready.
     time.sleep(MAKE_TERM_CONNECT_DELAY)
 
-    child = spawnclass("make cleanterm", env=env, timeout=timeout,
+    child = spawnclass("{} cleanterm".format(MAKE), env=env, timeout=timeout,
                        codec_errors='replace', echo=False)
 
     # on many platforms, the termprog needs a short while to be ready...

dist/tools/ci/print_toolchain_versions.sh

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+MAKE=${MAKE:-make}
+
 get_cmd_version() {
     if [ -z "$1" ]; then
         return
@@ -80,7 +82,7 @@ get_sys_shell() {
 }
 
 _get_make_shell() {
-    make -sf - 2>/dev/null <<MAKEFILE
+    ${MAKE} -sf - 2>/dev/null <<MAKEFILE
 \$(info \$(realpath \$(SHELL)))
 MAKEFILE
 }
@@ -156,7 +158,7 @@ for c in \
          cppcheck \
          doxygen \
          git \
-         make \
+         ${MAKE} \
          openocd \
          python \
          python2 \

dist/tools/compile_and_test_for_board/compile_and_test_for_board.py

@@ -95,6 +95,8 @@ LOG_HANDLER.setFormatter(logging.Formatter(logging.BASIC_FORMAT))
 
 LOG_LEVELS = ('debug', 'info', 'warning', 'error', 'fatal', 'critical')
 
+MAKE = os.environ.get('MAKE', 'make')
+
 
 class ErrorInTest(Exception):
     """Custom exception for a failed test.
@@ -156,7 +158,7 @@ def apps_directories(riotdir, apps_dirs=None, apps_dirs_skip=None):
 
 def _riot_applications_dirs(riotdir):
     """Applications directories in the RIOT repository with relative path."""
-    cmd = ['make', 'info-applications']
+    cmd = [MAKE, 'info-applications']
 
     out = subprocess.check_output(cmd, cwd=riotdir)
     out = out.decode('utf-8', errors='replace')
@@ -383,7 +385,7 @@ class RIOTApplication():
         full_env = os.environ.copy()
         full_env.update(env)
 
-        cmd = ['make']
+        cmd = [MAKE]
         cmd.extend(self.MAKEFLAGS)
         cmd.extend(['-C', os.path.join(self.riotdir, self.appdir)])
         cmd.extend(args)

dist/tools/compile_test/compile_test.py

@@ -38,6 +38,9 @@ except ImportError:
 from itertools import tee
 
 
+MAKE = environ.get("MAKE", "make")
+
+
 class Termcolor:
     red = '\033[1;31m'
     green = '\033[1;32m'
@@ -90,7 +93,7 @@ def get_results_and_output_from(fd):
 
 
 def get_app_dirs():
-    return check_output(["make", "-f", "makefiles/app_dirs.inc.mk", "info-applications"]) \
+    return check_output([MAKE, "-f", "makefiles/app_dirs.inc.mk", "info-applications"]) \
             .decode("utf-8", errors="ignore")\
             .split()
 
@@ -130,7 +133,7 @@ def build_all():
             stdout.flush()
             try:
                 app_dir = join(riotbase, folder, application)
-                subprocess = Popen(('make', 'buildtest'),
+                subprocess = Popen((MAKE, 'buildtest'),
                                    bufsize=1, stdin=null, stdout=PIPE, stderr=null,
                                    cwd=app_dir,
                                    env=subprocess_env)