C11/C++11 are the default for the RTEMS 4.12 GCC

builder.py

@@ -199,10 +199,10 @@ def cpuIncludes():
             '-Ifreebsd/sys/@CPU@/include']
 
 def cflags():
-    return ['-std=gnu11']
+    return []
 
 def cxxflags():
-    return ['-std=gnu++11']
+    return []
 
 def headerPaths():
     #         local path                      wildcard             dest path

libbsd_waf.py

@@ -45,8 +45,8 @@ def build(bld):
         common_flags += ["-Wno-pointer-sign"]
     else:
         common_flags += ["-w"]
-    cflags = ['-std=gnu11'] + common_flags
-    cxxflags = ['-std=gnu++11'] + common_flags
+    cflags = [] + common_flags
+    cxxflags = [] + common_flags
 
     # Defines
     defines = []