diff --git a/configs/sim/README.txt b/configs/sim/README.txt
index 2ad8099f9dc..f02f4425819 100644
--- a/configs/sim/README.txt
+++ b/configs/sim/README.txt
@@ -10,6 +10,7 @@ Contents
   o Debugging
   o Issues
     - 64-bit Issues
+    - Compiler differences
     - Stack Size Issues
     - Buffered I/O Issues
     - Networking Issues
@@ -107,6 +108,14 @@ are included in the LDFLAGS. See the patch
 0001-Quick-hacks-to-build-sim-nsh-ostest-on-x86_64-as-32-.patch that can be found at
 http://tech.groups.yahoo.com/group/nuttx/files.
 
+Compiler differences
+--------------------
+
+operator new
+
+  Problem:     "'operator new' takes size_t ('...') as first parameter"
+  Workaround:   Add -fpermissive to the compilation flags
+
 Stack Size Issues
 -----------------
 When you run the NuttX simulation, it uses stacks allocated by NuttX from the
diff --git a/configs/sim/nx11/Make.defs b/configs/sim/nx11/Make.defs
index 2dfda3e6597..d385d823be0 100644
--- a/configs/sim/nx11/Make.defs
+++ b/configs/sim/nx11/Make.defs
@@ -53,6 +53,11 @@ ARCHINCLUDES		= -I. -isystem $(TOPDIR)/include
 ARCHINCLUDESXX		= -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
 ARCHSCRIPT		=
 
+ifeq ($(CONFIG_SIM_M32),y)
+  ARCHCPUFLAGS		+= -m32
+  ARCHCPUFLAGSXX	+= -m32
+endif
+
 CROSSDEV		=
 CC			= $(CROSSDEV)gcc
 CXX			= $(CROSSDEV)g++
@@ -79,8 +84,20 @@ else
   EXEEXT		=
 endif
 
-ifeq ("${CONFIG_DEBUG_SYMBOLS}","y")
-  LDFLAGS		+= -g
+LDLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(LD)
+CCLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(CC)
+LDFLAGS			= $(ARCHSCRIPT)	# For backward compatibility, same as CCLINKFLAGS
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDLINKFLAGS		+= -g
+  CCLINKFLAGS		+= -g
+  LDFLAGS			+= -g
+endif
+
+ifeq ($(CONFIG_SIM_M32),y)
+  LDLINKFLAGS		+= -melf_i386
+  CCLINKFLAGS		+= -m32
+  LDFLAGS			+= -m32
 endif
 
 define PREPROCESS
diff --git a/configs/sim/nxwm/Make.defs b/configs/sim/nxwm/Make.defs
index 89fc79cd321..958ded466c2 100644
--- a/configs/sim/nxwm/Make.defs
+++ b/configs/sim/nxwm/Make.defs
@@ -53,6 +53,11 @@ ARCHINCLUDES		= -I. -isystem $(TOPDIR)/include
 ARCHINCLUDESXX		= -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
 ARCHSCRIPT		=
 
+ifeq ($(CONFIG_SIM_M32),y)
+  ARCHCPUFLAGS		+= -m32
+  ARCHCPUFLAGSXX	+= -m32
+endif
+
 CROSSDEV		=
 CC			= $(CROSSDEV)gcc
 CXX			= $(CROSSDEV)g++
@@ -79,8 +84,20 @@ else
   EXEEXT		=
 endif
 
-ifeq ("${CONFIG_DEBUG_SYMBOLS}","y")
-  LDFLAGS		+= -g
+LDLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(LD)
+CCLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(CC)
+LDFLAGS			= $(ARCHSCRIPT)	# For backward compatibility, same as CCLINKFLAGS
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDLINKFLAGS		+= -g
+  CCLINKFLAGS		+= -g
+  LDFLAGS			+= -g
+endif
+
+ifeq ($(CONFIG_SIM_M32),y)
+  LDLINKFLAGS		+= -melf_i386
+  CCLINKFLAGS		+= -m32
+  LDFLAGS			+= -m32
 endif
 
 define PREPROCESS
diff --git a/configs/sim/touchscreen/Make.defs b/configs/sim/touchscreen/Make.defs
index 599b3743279..2ea9a3c8902 100644
--- a/configs/sim/touchscreen/Make.defs
+++ b/configs/sim/touchscreen/Make.defs
@@ -53,6 +53,11 @@ ARCHINCLUDES		= -I. -isystem $(TOPDIR)/include
 ARCHINCLUDESXX		= -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
 ARCHSCRIPT		=
 
+ifeq ($(CONFIG_SIM_M32),y)
+  ARCHCPUFLAGS		+= -m32
+  ARCHCPUFLAGSXX	+= -m32
+endif
+
 CROSSDEV		=
 CC			= $(CROSSDEV)gcc
 CXX			= $(CROSSDEV)g++
@@ -79,8 +84,20 @@ else
   EXEEXT		=
 endif
 
-ifeq ("${CONFIG_DEBUG_SYMBOLS}","y")
-  LDFLAGS		+= -g
+LDLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(LD)
+CCLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(CC)
+LDFLAGS			= $(ARCHSCRIPT)	# For backward compatibility, same as CCLINKFLAGS
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDLINKFLAGS		+= -g
+  CCLINKFLAGS		+= -g
+  LDFLAGS			+= -g
+endif
+
+ifeq ($(CONFIG_SIM_M32),y)
+  LDLINKFLAGS		+= -melf_i386
+  CCLINKFLAGS		+= -m32
+  LDFLAGS			+= -m32
 endif
 
 define PREPROCESS