diff --git a/configure/CONFIG.gnuCommon b/configure/CONFIG.gnuCommon
index f0548024e..63d07d11b 100644
--- a/configure/CONFIG.gnuCommon
+++ b/configure/CONFIG.gnuCommon
@@ -55,3 +55,7 @@ GNU_LDLIBS_YES = -lgcc
 
 # Use GNU compiler flags to generate header dependancies files
 HDEPENDS_METHOD = CFLAGS
+
+# Disable strict alias optimizations (and warnings)
+CODE_CFLAGS += -fno-strict-aliasing
+CODE_CXXFLAGS += -fno-strict-aliasing
diff --git a/configure/os/CONFIG.Common.vxWorksCommon b/configure/os/CONFIG.Common.vxWorksCommon
index 95084889a..da4f76731 100644
--- a/configure/os/CONFIG.Common.vxWorksCommon
+++ b/configure/os/CONFIG.Common.vxWorksCommon
@@ -176,7 +176,11 @@ OPT_CXXFLAGS_YES = -O2
 
 #--------------------------------------------------
 # code flags
-CODE_CFLAGS =
+# From gcc 3 on, casting from function ptr to data ptr generates warning
+CODE_CFLAGS_3 = -fno-strict-aliasing
+CODE_CFLAGS_4 = -fno-strict-aliasing
+CODE_CFLAGS = $(CODE_CFLAGS_$(VX_GNU_MAJOR_VERSION))
+
 #
 # For vxWorks versions before 6.3 we need this g++ compiler flag
 CODE_CXXFLAGS_5 = -fno-implicit-templates
@@ -184,7 +188,7 @@ CODE_CXXFLAGS_6.0 = -fno-implicit-templates
 CODE_CXXFLAGS_6.1 = -fno-implicit-templates
 CODE_CXXFLAGS_6.2 = -fno-implicit-templates
 CODE_CXXFLAGS_6 = $(CODE_CXXFLAGS_$(VXWORKS_VERSION))
-CODE_CXXFLAGS = $(CODE_CXXFLAGS_$(VXWORKS_MAJOR_VERSION))
+CODE_CXXFLAGS = $(CODE_CXXFLAGS_$(VXWORKS_MAJOR_VERSION)) $(CODE_CFLAGS_$(VX_GNU_MAJOR_VERSION))
 
 #--------------------------------------------------
 # no shared libs for vxWorks