docs(GCC_ToolChain): Update cross-compile instructions for AM335x/AM437x

Update the cross-compile commands and instructions for AM335x/AM437x adding about CFLAGS to avoid the build errors

Signed-off-by: Telukula Jeevan Kumar Sahu <[email protected]>

source/linux/Overview/GCC_ToolChain.rst

@@ -133,7 +133,7 @@ libraries.
    .. code-block:: c
 
       #include <stdio.h>
-      
+
       int main() {
           printf ("Hello World from TI!!!\n");
           return 0;
@@ -145,20 +145,40 @@ libraries.
    - **Compile Directly** : Cross-compile the **helloworld.c** file using the
      cross-compile toolchain directly
 
-     .. code-block:: console
+     .. ifconfig:: CONFIG_part_variant in ('AM335X', 'AM437X')
+
+       .. code-block:: console
+
+          host# ${CROSS_COMPILE_64}gcc ${CFLAGS} --sysroot=${SYSROOT_64} helloworld.c -o helloworld
+
+       Pass the CFLAGS: :file:`-march=armv7-a` :file:`-mthumb` :file:`-mfpu=neon` :file:`-mfloat-abi=hard`
+       to the cross compiler to avoid the build issues.
+
+     .. ifconfig:: CONFIG_part_variant not in ('AM335X', 'AM437X')
 
-        host# ${CROSS_COMPILE_64}gcc --sysroot=${SYSROOT_64} helloworld.c -o helloworld
+       .. code-block:: console
+
+          host# ${CROSS_COMPILE_64}gcc --sysroot=${SYSROOT_64} helloworld.c -o helloworld
 
      Be sure to give the correct path to the gcc cross compiler and target
      sysroot as listed earlier.
 
    - **Using the environement setup script** : Cross-compile after sourcing
      the setup script
 
-     .. code-block:: console
+     .. ifconfig:: CONFIG_part_variant in ('AM335X', 'AM437X')
+
+       .. code-block:: console
+
+          host# source ${ENV_SETUP_64}
+          host# ${CC} ${CFLAGS} helloworld.c -o helloworld
+
+     .. ifconfig:: CONFIG_part_variant not in ('AM335X', 'AM437X')
+
+       .. code-block:: console
 
-        host# source ${ENV_SETUP_64}
-        host# ${CC} helloworld.c -o helloworld
+          host# source ${ENV_SETUP_64}
+          host# ${CC} helloworld.c -o helloworld
 
 3. After the above steps are run you should now have a **helloworld**
    executable in your directory that has been compiled for the ARM. A