Re: [PATCH] libstdc++: Implement C++26 features (P2546R5)

[Jonathan Wakely]

On Mon, 3 Jun 2024 at 14:36, Peter0x44 wrote:
> > +void
> > +std::breakpoint() noexcept
> > +{
> > +#if _GLIBCXX_HAVE_DEBUGAPI_H && defined(_WIN32) &&
> > !defined(__CYGWIN__)
> > +  DebugBreak();
> > +#elif __has_builtin(__builtin_debugtrap)
> > +  __builtin_debugtrap(); // Clang
> > +#elif defined(__i386__) || defined(__x86_64__)
> > +  __asm__ volatile ("int3");
> Worth noting, currently gcc has some bugs around its handling of int3,

s/gcc/gdb/ ?

> https://sourceware.org/bugzilla/show_bug.cgi?id=31194
> int3;nop seems to work around it okay. __builtin_debugtrap() of clang
> does run into the same issues.

It seemed to work OK for me, maybe because there's no code after it?

void breakpoint() {
__asm__ volatile ("int3);
}