DNM: Switch Matter samples to picolibc

Signed-off-by: Damian Krolik <damian.krolik@nordicsemi.no>

Author: Damian-Nordic

config/nrfconnect/chip-module/CMakeLists.txt

@@ -125,6 +125,10 @@ else()
     set(DATA_MODEL_INTERFACE "disabled")
 endif()
 
+# Force libstdc++_nano
+
+set_linker_property(PROPERTY c++_library "-lstdc++_nano")
+
 # ==============================================================================
 # Generate configuration for CHIP GN build system
 # ==============================================================================

config/nrfconnect/chip-module/Kconfig.defaults

@@ -25,9 +25,12 @@ if CHIP
 # ==============================================================================
 
 choice LIBC_IMPLEMENTATION
-    default NEWLIB_LIBC
+    default PICOLIBC
 endchoice
 
+config NEWLIB_LIBC_NANO
+	default n
+
 config ASSERT
     default y
 

config/zephyr/Kconfig

@@ -29,7 +29,6 @@ menuconfig CHIP
 	select CPP
 	imply REQUIRES_FULL_LIBCPP
 	imply REQUIRES_FULL_LIBC
-	imply NEWLIB_LIBC_NANO
 	imply CBPRINTF_LIBC_SUBSTS
 	imply POSIX_API if !ARCH_POSIX && !CHIP_NRF_PLATFORM
 	imply EVENTFD if !ARCH_POSIX

src/platform/Zephyr/SysHeapMalloc.cpp

@@ -184,6 +184,7 @@ EXTERNALLY_VISIBLE void * WRAP(calloc)(size_t num, size_t size) ALIAS("_ZN4chip1
 EXTERNALLY_VISIBLE void * WRAP(realloc)(void * mem, size_t size) ALIAS("_ZN4chip11DeviceLayer6Malloc7ReallocEPvj");
 EXTERNALLY_VISIBLE void WRAP(free)(void * mem) ALIAS("_ZN4chip11DeviceLayer6Malloc4FreeEPv");
 
+#ifdef CONFIG_NEWLIB_LIBC
 EXTERNALLY_VISIBLE void * WRAP(_malloc_r)(_reent *, size_t size)
 {
     return WRAP(malloc)(size);
@@ -203,6 +204,7 @@ EXTERNALLY_VISIBLE void WRAP(_free_r)(_reent *, void * mem)
 {
     WRAP(free)(mem);
 }
+#endif // CONFIG_NEWLIB_LIBC
 
 } // extern "C"