Fold Expression not working

I am using IDE 1.5.0 with the -std=gnu++17 flag set

When trying to use fold expression, the compiler throws an error.

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Super User

I'm not keen on new language features, but a simple test worked when test() called from main():

 template <typename... Ty>
 auto sum(Ty... args) {
 return (args + ...);
 }
 
 extern "C" int test()
 {
	 return sum(1,2,3);
 }

This is more a g++ question rather than STM.

Graduate II

STM32CubeIDE 1.5.0 (1.4.2 is fine too) no issue to me if C++17 usage. According to me proper g++ switch is "-std=c++17" not "-std=gnu++17"

Associate

It doesn't work for me and on -std = c ++ 17

Associate

Correction: works, but IDE emphasizes fold expression. Apparently we should expect further fixes.

Graduate II

Compiler (gcc/g++ here) is one thing, C editor code analysis engine another ...

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