Temporary pointer compile error on MacOS Sonoma with XCode 15.0

[morotsgurka]

When using the plugin with Unreal Engine 5.3.1 on MacOS Sonoma 14.0 and XCode 15.0, i get a compile issue in StringUtils.cpp.
The error is line 7:
const char* originalStr = TCHAR_TO_ANSI(*str);
where i get the following error: temporary whose address is used as value of local variable 'originalStr' will be destroyed at the end of the full-expression [-Werror,-Wdangling]

[Toernblom]

Same error here, Ubuntu 22.04 , UE 5.3.1

[Toernblom]

Fixed by building https://github.com/eclipse/mosquitto from source.

Need to change a few things,

first in StringUtils.cpp from the plugin

auto convertedStr = StringCast<ANSICHAR>(*str);
const char* originalStr = convertedStr.Get();

In mosquitto src CMakeLists.txt

option(WITH_STATIC_LIBRARIES "Build static versions of the libmosquitto/pp libraries?" ON)
option(WITH_PIC "Build the static library with PIC (Position Independent Code) enabled archives?" ON)

in config.mk

WITH_STATIC_LIBRARIES:=yes

Then "make"

Move the outputs libmosquitto.so , libmosquittopp.so and _static to the thirdParty/linux/ appropiate folders.

i also added these lines to the build.cs of the plugin.

PublicAdditionalLibraries.Add("/usr/lib/x86_64-linux-gnu/libssl.a");
PublicAdditionalLibraries.Add("/usr/lib/x86_64-linux-gnu/libcrypto.a");

[YasserNezzari]

@Toernblom I had the same issue when packaging for android, your solution worked for me, thank you !

[morotsgurka]

@Toernblom I've followed your steps and updated our fork of the plugin with the changes. One problem I have is that when building for shipping i get a lot of build errors because there exists 2 libssl.a,
Example:

"ld.lld: error: duplicate symbol: SSL_CTX_set_purpose"
"ld.lld: error: duplicate symbol: SSL_add1_host"

The definitions are:

• /usr/lib/x86_64-linux-gnu/libssl.a (the one included in .Build.cs)
• /dirToEngine/Engine/Source/ThirdParty/OpenSSL/1.1.1t/lib/Unix/x86_64-unknown-linux-gnu/libssl.a (Unreal's included OpenSSL)

I've tried to link to the engine provided libs but that does not seem to work (or I'm doing something wrong).
Found this on integrating third-party libraries into Unreal and tried to make the path relative to the Engine path (so it would work for more people than just my Unreal path).

OS: Ubuntu 22.04.4 LTS
Unreal Engine 5.3.2 (Linux)