Build: Renames to "debug_build" and fixes implementation.

wscript

@@ -90,7 +90,7 @@ def options(opt):
         opt.add_option('--regression_benchmarks', type='string', help='config file (json) to compile benchmark for regression', dest='regression_benchmarks')
         opt.add_option('--cpp14', action='store_true', default=False, help='force c++-14 compilation [--cpp14]', dest='cpp14')
         opt.add_option('--no-native', action='store_true', default=False, help='disable -march=native, which can cause some troubles [--no-native]', dest='no_native')
-        opt.add_option('--debug-build', action='store_true', default=False, help='build a debugging build with limited optimization', dest='debug_build')
+        opt.add_option('--debug_build', action='store_true', default=False, help='build a debugging build with limited optimization', dest='debug_build')
 
 
         try:
@@ -140,7 +140,7 @@ def configure(conf):
                 common_flags = "-Wall -std=c++11"
             if conf.env.CXX_NAME in ["clang", "llvm"]:
                 common_flags += " -fdiagnostics-color"
-            if conf.env.debug_build:
+            if conf.options.debug_build:
                 opt_flags = " -Og -g"
             else:
                 opt_flags = " -O3 -g"