I recently tried to build a project with clang and clang++. Up to now it has only been built with GCC.

One of the problems that I saw was with code that is of the following form

if (expression)
{
   var = var;
}

I assume that this was done to give a place in the code to put breakpoints in debug builds. In optimized builds the code should all be optimized away.

We build with -Werror and this fails to build with

error: explicitly assigning value of variable of type 'int' to itself [-Werror,-Wself-assign]

I can get rid of the warning/error with -Wno-self-assign or -Wno-error=self-assign or locally with

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wself-assign"
var = var;
#pragma clang diagnostic pop

(possibly in a MACRO).

Does anyone have any other suggestions for code without side effects that could be used for breakpoints?