The compiler does not ship with RTS libraries that support C++ exceptions. In this use case, a previous build with compiler, then a use of mklib, created these libraries.

rtsv7R4_A_be_v3D16_eabi_eh.lib
rtsv7R4_T_be_v3D16_eabi_eh.lib

These libraries are the same except the first is the ARM variant, and the second is the Thumb variant.

The attached hello.cpp is a typical hello world program that uses C++ cout.

In this build ...

armcl --code_state=16 -mv7r4 --float_support=VFPv3D16 --exceptions hello.cpp -z -o hello.out -m hello.map

Because of --code_state=16, the thumb variant of the library should be chosen. But it is not.

% findstr rts hello.map | more
                  00000020    000011d4     rtsv7R4_A_be_v3D16_eabi_eh.lib : _scanfi.c.obj (.text:__TI_scanfi)

The ARM variant of the library is chosen.

To get the Thumb variant, it must be explicitly specified.

% armcl --code_state=16 -mv7r4 --float_support=VFPv3D16 --exceptions hello.cpp -z -o hello.out -m hello.map -l rtsv7R4_T_be_v3D16_eabi_eh.lib