[Silabs] Fix compilation issues with gcc 12.2

examples/platform/silabs/efr32/BUILD.gn

@@ -227,6 +227,10 @@ config("efr32-common-config") {
   if (enable_heap_monitoring) {
     defines += [ "HEAP_MONITORING" ]
   }
+
+  # Do not warn for LOAD segment with RWX permissions
+  # Uncomment this cflag when pigweed update is done and GCC 12.2 is used.
+  #ldflags = [ "-Wl,--no-warn-rwx-segment" ]
 }
 
 config("silabs-wifi-config") {
@@ -279,6 +283,7 @@ source_set("efr32-common") {
 
   sources = [
     "${silabs_common_plat_dir}/heap_4_silabs.c",
+    "${silabs_common_plat_dir}/syscalls_stubs.cpp",
     "efr32_utils.cpp",
     "init_efrPlatform.cpp",
     "matter_config.cpp",

examples/platform/silabs/syscalls_stubs.cpp

@@ -0,0 +1,215 @@
+/*
+ *
+ *    Copyright (c) 2023 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/*
+    This file is only used to implement weak syscall stubs
+    that gcc-arm-none-eabi 12.2.1 expect to link when using Libc
+    (newlib/libc_nano)
+*/
+
+#include <reent.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if SILABS_LOG_OUT_UART
+#include "uart.h"
+#endif
+
+int _close(int file);
+int _fstat(int file, struct stat * st);
+int _isatty(int file);
+int _lseek(int file, int ptr, int dir);
+int _read(int file, char * ptr, int len);
+int _write(int file, const char * ptr, int len);
+
+/**************************************************************************
+ * @brief
+ *  Close a file.
+ *
+ * @param[in] file
+ *  File you want to close.
+ *
+ * @return
+ *  Returns 0 when the file is closed.
+ **************************************************************************/
+int __attribute__((weak)) _close(int file)
+{
+    (void) file;
+    return 0;
+}
+
+/**************************************************************************
+ * @brief Exit the program.
+ * @param[in] status The value to return to the parent process as the
+ *            exit status (not used).
+ **************************************************************************/
+void __attribute__((weak)) _exit(int status)
+{
+    (void) status;
+    while (1)
+    {
+    } /* Hang here forever... */
+}
+
+/*************************************************************************
+ * @brief
+ *  Status of an open file.
+ *
+ * @param[in] file
+ *  Check status for this file.
+ *
+ * @param[in] st
+ *  Status information.
+ *
+ * @return
+ *  Returns 0 when st_mode is set to character special.
+ ************************************************************************/
+int __attribute__((weak)) _fstat(int file, struct stat * st)
+{
+    (void) file;
+    (void) st;
+    return 0;
+}
+
+/**************************************************************************
+ * @brief Get process ID.
+ *************************************************************************/
+int __attribute__((weak)) _getpid(void)
+{
+    return 1;
+}
+
+/**************************************************************************
+ * @brief
+ *  Query whether output stream is a terminal.
+ *
+ * @param[in] file
+ *  Descriptor for the file.
+ *
+ * @return
+ *  Returns 1 when query is done.
+ **************************************************************************/
+int __attribute__((weak)) _isatty(int file)
+{
+    (void) file;
+    return 1;
+}
+
+/**************************************************************************
+ * @brief Send signal to process.
+ * @param[in] pid Process id (not used).
+ * @param[in] sig Signal to send (not used).
+ *************************************************************************/
+int __attribute__((weak)) _kill(int pid, int sig)
+{
+    (void) pid;
+    (void) sig;
+    return -1;
+}
+
+/**************************************************************************
+ * @brief
+ *  Set position in a file.
+ *
+ * @param[in] file
+ *  Descriptor for the file.
+ *
+ * @param[in] ptr
+ *  Poiter to the argument offset.
+ *
+ * @param[in] dir
+ *  Directory whence.
+ *
+ * @return
+ *  Returns 0 when position is set.
+ *************************************************************************/
+int __attribute__((weak)) _lseek(int file, int ptr, int dir)
+{
+    (void) file;
+    (void) ptr;
+    (void) dir;
+    return 0;
+}
+
+/**************************************************************************
+ * @brief
+ *  Read from a file.
+ *
+ * @param[in] file
+ *  Descriptor for the file you want to read from.
+ *
+ * @param[in] ptr
+ *  Pointer to the chacaters that are beeing read.
+ *
+ * @param[in] len
+ *  Number of characters to be read.
+ *
+ * @return
+ *  Number of characters that have been read.
+ *************************************************************************/
+int __attribute__((weak)) _read(int file, char * ptr, int len)
+{
+    (void) file;
+#if SILABS_LOG_OUT_UART
+    return = uartConsoleRead(ptr, len);
+#else
+    (void) ptr;
+    (void) len;
+#endif
+    return 0;
+}
+
+/**************************************************************************
+ * @brief
+ *  Write to a file.
+ *
+ * @param[in] file
+ *  Descriptor for the file you want to write to.
+ *
+ * @param[in] ptr
+ *  Pointer to the text you want to write
+ *
+ * @param[in] len
+ *  Number of characters to be written.
+ *
+ * @return
+ *  Number of characters that have been written.
+ **************************************************************************/
+int __attribute__((weak)) _write(int file, const char * ptr, int len)
+{
+    (void) file;
+#if SILABS_LOG_OUT_UART
+    uartConsoleWrite(ptr, len);
+#else
+    (void) ptr;
+#endif
+
+    return len;
+}
+
+#ifdef __cplusplus
+}
+#endif

src/platform/silabs/KeyValueStoreManagerImpl.cpp

@@ -75,7 +75,7 @@ uint16_t KeyValueStoreManagerImpl::hashKvsKeyString(const char * key) const
     uint8_t hash256[Crypto::kSHA256_Hash_Length] = { 0 };
     Crypto::Hash_SHA256(reinterpret_cast<const uint8_t *>(key), strlen(key), hash256);
 
-    uint16_t hash16, i = 0;
+    uint16_t hash16 = 0, i = 0;
 
     while (!hash16 && (i < (Crypto::kSHA256_Hash_Length - 1)))
     {

third_party/silabs/efr32_sdk.gni

@@ -502,6 +502,10 @@ template("efr32_sdk") {
     cflags += [
       "-Wno-maybe-uninitialized",
       "-Wno-shadow",
+
+      # see https://github.com/project-chip/connectedhomeip/issues/26058
+      # Uncomment this cflag when pigweed update is done and GCC 12.2 is used.
+      # "-Wno-error=array-parameter",
     ]
 
     if (silabs_family == "efr32mg24" || silabs_family == "mgm24") {