Call to specific _wrap_sbrk to support 2 region model for heap and stack

Author: adustm

platform/mbed_retarget.cpp

@@ -1053,12 +1053,13 @@ extern "C" uint32_t  __HeapLimit;
 extern "C" int errno;
 
 // Dynamic memory allocation related syscall.
-#if defined(TARGET_NUVOTON)
+#if (defined(TARGET_NUVOTON) || defined(TWO_RAM_REGIONS))
 
 // Overwrite _sbrk() to support two region model (heap and stack are two distinct regions).
 // __wrap__sbrk() is implemented in:
 // TARGET_NUMAKER_PFM_NUC472    targets/TARGET_NUVOTON/TARGET_NUC472/TARGET_NUMAKER_PFM_NUC472/TOOLCHAIN_GCC_ARM/nuc472_retarget.c
 // TARGET_NUMAKER_PFM_M453      targets/TARGET_NUVOTON/TARGET_M451/TARGET_NUMAKER_PFM_M453/TOOLCHAIN_GCC_ARM/m451_retarget.c
+// TARGET_STM32L4               targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L4/l4_retarget.c
 extern "C" void *__wrap__sbrk(int incr);
 extern "C" caddr_t _sbrk(int incr) {
     return (caddr_t) __wrap__sbrk(incr);