In MSVC, DebugBreak() or __debugbreak cause a debugger to break. On x86 it is equivalent to writing \"_asm int 3\", on x64 it is something different. When compiling with gcc
I just added a module to portable-snippets (a collection of public domain snippets of portable code) to do this. It's not 100% portable, but it should be pretty robust:
__builtin_debugtrap
for some versions of clang (identified with __has_builtin(__builtin_debugtrap)
)__debugbreak
__breakpoint(42)
int3
.inst 0xde01
.inst 0xd4200000
.inst 0xe7f001f0
bpt
__builtin_trap
signal.h
and
defined(SIGTRAP)
(i.e., POSIX), raise(SIGTRAP)
raise(SIGABRT)
In the future the module in portable-snippets may expand to include other logic and I'll probably forget to update this answer, so you should look there for updates. It's public domain (CC0), so feel free to steal the code.