Make src/platform/logging:stdio use log redirection on CHIP_PLATFORM_…

…CUSTOM_LOG platforms.

This makes stdout logging work in unit tests on Darwin.

src/platform/logging/BUILD.gn

@@ -25,7 +25,7 @@ if (current_os == "android") {
   }
 }
 
-static_library("stdio") {
+source_set("stdio") {
   sources = [ "impl/stdio/Logging.cpp" ]
 
   deps = [

src/platform/logging/impl/stdio/Logging.cpp

@@ -20,3 +20,16 @@ void ENFORCE_FORMAT(3, 0) LogV(const char * module, uint8_t category, const char
 } // namespace Platform
 } // namespace Logging
 } // namespace chip
+
+// Use log redirection on platforms that don't use
+// chip::Logging::Platform::LogV directly (e.g. Darwin)
+#if CHIP_PLATFORM_CUSTOM_LOG
+
+#include <lib/support/logging/CHIPLogging.h>
+
+__attribute__((constructor)) static void CHIPConfigureStdoutLogging(void)
+{
+    chip::Logging::SetLogRedirectCallback(chip::Logging::Platform::LogV);
+}
+
+#endif // CHIP_PLATFORM_CUSTOM_LOG