[Bug c++/86129] New: Expect SIGBUS but program just silently exits

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86129

            Bug ID: 86129
           Summary: Expect SIGBUS but program just silently exits
           Product: gcc
           Version: 8.1.0
            Status: RESOLVED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: p.sanders at alpinesoft dot co.uk
  Target Milestone: ---
            Status: RESOLVED
        Resolution: INVALID

Hi guys,

My first post here, hope I do things right.

The following code snippet just exits the program silently rather than
generating SIGBUS as you would expect it to.  I don't think what doing that is
appropriate.

clang *does* generate SIGBUS, and although the code below is, strictly
speaking, UB, I don't think gcc should behave as it does, for obvious reasons.

OK, here's the code:

    #include <iostream>

    int main()
    {
        char *p = (char *) nullptr;
        std::cout << "Watch the " << p << "birdie" << std::endl;
        return 0;
    }

And here's the output (note: no SIGBUS):

    Watch the 

Live demo here (where you can also try running it with clang)

https://wandbox.org/permlink/M1S74HqjT1HvLtr0

Sounds like an easy fix.  Thanks.

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Probably some nonnull attribute somewhere.  Anyway, GIGO.