From 705e6287b98697cffe21dd294e5ba48506622783 Mon Sep 17 00:00:00 2001
From: Peter Barker <pbarker@barker.dropbear.id.au>
Date: Wed, 21 Feb 2018 12:13:49 +1100
Subject: [PATCH] Tools: add a build-with-disabled-features script

---
 .../autotest/build-with-disabled-features.py  | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100755 Tools/autotest/build-with-disabled-features.py

diff --git a/Tools/autotest/build-with-disabled-features.py b/Tools/autotest/build-with-disabled-features.py
new file mode 100755
index 0000000000..10a79f289d
--- /dev/null
+++ b/Tools/autotest/build-with-disabled-features.py
@@ -0,0 +1,99 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+
+'''
+Build ArduPilot with various build-time options enabled or disabled
+'''
+
+import re
+import shutil
+import subprocess
+
+from pysim import util
+
+
+class Builder():
+
+    def __init__(self):
+        self.config = 'ArduCopter/APM_Config.h'
+        self.autotest_build = "build.ArduCopter"
+
+        # list other features that have to be disabled when a feature
+        # is disabled (recursion not done; be exhaustive):
+        self.reverse_deps = {
+            "AC_FENCE": ["AC_AVOID_ENABLED"],
+            "PROXIMITY_ENABLED": ["AC_AVOID_ENABLED"],
+            "AC_RALLY": ["AC_TERRAIN"],
+        }
+
+    def reverse_deps_for_var(self, var):
+        return self.reverse_deps.get(var, [])
+
+    def progress(self, string):
+        print("BWFD: %s" % string)
+
+    def get_config_variables(self):
+        ret = []
+        with open(util.reltopdir(self.config)) as fd:
+            for line in fd:
+                match = re.match('//#define ([A-Z_]+)\s+(ENABLED|DISABLED)',
+                                 line)
+                if match is not None:
+                    ret.append(match.group(1))
+        return ret
+
+    def disable_option_in_config(self, var):
+        tmpfile = util.reltopdir(self.config) + ".tmp"
+        shutil.move(self.config, tmpfile)
+        out_fd = open(self.config, 'w+')
+        with open(util.reltopdir(tmpfile)) as fd:
+            for line in fd:
+                things_to_toggle = self.reverse_deps_for_var(var)
+                things_to_toggle.append(var)
+                for thing in things_to_toggle:
+                    line = re.sub(
+                        '//(#define\s+%s\s+(ENABLED|DISABLED))' % thing,
+                        "\\1",
+                        line)
+                out_fd.write(line)
+        out_fd.close()
+
+    def backup_config_filepath(self):
+        return util.reltopdir(self.config) + ".backup"
+
+    def backup_config(self):
+        shutil.copy(self.config, self.backup_config_filepath())
+
+    def restore_config(self):
+        shutil.copy(self.backup_config_filepath(), self.config)
+
+    def build_works(self):
+        self.progress("Building")
+        autotest = util.reltopdir("Tools/autotest/autotest.py")
+        try:
+            ret = util.run_cmd([autotest, self.autotest_build])
+        except subprocess.CalledProcessError:
+            return False
+        return ret == 0
+
+    def run(self):
+        self.backup_config()
+        successes = []
+        failures = []
+        for var in self.get_config_variables():
+            self.disable_option_in_config(var)
+            if self.build_works():
+                self.progress("%s OK" % var)
+                successes.append(var)
+            else:
+                self.progress("%s BAD" % var)
+                failures.append(var)
+            self.restore_config()
+
+        self.progress("Successes: %s" % str(successes))
+        self.progress("Failures: %s" % str(failures))
+
+
+builder = Builder()
+builder.run()