stacktrace_from_exception on non-x86 about stacktrace HOT 2 OPEN

(2) shouldn't be needed on it's face because I'm using gcc/libstdc++

There are many people who use other runtimes and there's no known to me way to detect that. How should I warn them to avoid some runtimes or to be ready for leaks?

from stacktrace.

@apolukhin I did some exploring on this some time ago for detecting minimum versions of lib{std}c++ using _LIBCPP_GLIBC_PREREQ to detect libc++.

#include <features.h>

int main() {

// Starting with libc++-6, the glibc macro is in the libcpp namespace
#if defined _LIBCPP_GLIBC_PREREQ
# if _LIBCPP_GLIBC_PREREQ(LIBC_MAJOR, LIBC_MINOR)
    return 1;
# endif
#endif

}

It was succesful for gc/clang on Ubuntu, but I didn't ever get around to doing a more thorough anaysis. The comment on namespacing referes to https://reviews.llvm.org/D41892, so this method is not 100% accurate.

It looks like FreeBSD has been using libc++ since version 10 (https://wiki.freebsd.org/NewC%2B%2BStack) and OpenBSD appears to support both via clang (https://man.openbsd.org/intro.3). I'm assuming Mac uses libc++, as well. I know nothing about other platforms.

from stacktrace.