Provide example of appropriate CFLAGS for exposing registers on i386 required for inline assembly in tfm.c

IDE/XCODE/README.md

@@ -56,10 +56,12 @@ You can make an archive for a device, as well. That is a release build.
 
 ## Known issues:
 
-When building for older iPhone models that support the i386 architecture some
-inline assembly in the fast math library assumes 64-bit registers and must be
-disabled. This inline assembly can be disabled with `#define TFM_NO_ASM` when
-using the setting `#define USE_FAST_MATH` on i386 targets.
+When building for older i386 architectures and using tfm.c there are specific
+CFLAGS required to expose the necessary registers for inline assembly in tfm.c.
+An example script has been provided "build-for-i386.sh" that targets the watchos
+by default. If using SDK iphonesimulator10.1 or older you can change the SDK
+variable in that script however newer versions of the SDK no longer support
+i386 for the iphones.
 
 # Installing libwolfssl.a
 

IDE/XCODE/build-for-i386.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+WORKSPACE=$(eval "pwd")
+PROJ=wolfssl.xcodeproj
+CONFIG=Release
+SCHEME=wolfssl_ios
+ARCH=i386
+SDK=watchsimulator5.1
+CONF_BUILD_DIR=${WORKSPACE}/simulator
+
+xcodebuild clean build -project ${PROJ} -configuration ${CONFIG} \
+           -scheme ${SCHEME} -arch ${ARCH} -sdk ${SDK} \
+           BITCODE_GENERATION_MODE=bitcode \
+           OTHER_CFLAGS="-fembed-bitcode -O3 -fomit-frame-pointer" \
+           CONFIGURATION_BUILD_DIR=${CONF_BUILD_DIR}  \
+           -quiet

IDE/XCODE/user_settings.h

@@ -18,9 +18,6 @@
 
     /* fast math */
     #define USE_FAST_MATH
-    #ifdef __i386__
-        #define TFM_NO_ASM
-    #endif
     #define HAVE_ECC
 
     /* ECC speedups */