In some cases, the compiler's ability to eliminate dead code depends on the used language (C vs C++).

GCC detects that the if expression in the following code snippet evaluates to false and thus removes the dead code. The code is compiled as C++ code:

#include <stdio.h>
#include <stdbool.h>

static void __attribute__ ((noinline)) DCEMarker0_() {printf("DCE2.0");}

void f(unsigned s, unsigned c) {
    if (((!s == !c) && c && !(s))) {
        DCEMarker0_();
    }
}

However, if the same code is compiled as C code, GCC cannot eliminate the dead code anymore.

This can also be seen via the following Compiler Explorer link: https://godbolt.org/z/a9ned9Exb

(Might be related to 106379 and 106380)