[committed v5] libstdc++: Implement C++26 <debugging> features [PR119670]

[Jonathan Wakely]

On Fri, 29 Aug 2025 at 15:19, Rainer Orth <ro@cebitec.uni-bielefeld.de> wrote:
>
> Hi  Jonathan,
> >
> >> The src/c++26/debugging.cc file defines a global volatile int which can
> >> be set by debuggers to indicate when they are attached and detached from
> >> a running process. This allows std::is_debugger_present() to give a
> >> reliable answer, and additionally allows a debugger to choose how
> >> std::breakpoint() should behave. Setting the global to a positive value
> >> will cause std::breakpoint() to use that value as an argument to
> >> std::raise, so debuggers that prefer SIGABRT for breakpoints can select
> >> that. By default std::breakpoint() will use a platform-specific action
> >> such as the INT3 instruction on x86, or GCC's __builtin_trap().
> >
> > this patch broke Solaris/x86 bootstrap with /bin/as:
>
> it also broke bootstrap on macOS 11, 10.11:

I'll test a patch for both issues.

>
> In file included from /vol/gcc/src/hg/master/darwin/libstdc++-v3/src/c++26/debugging.cc:36:
> /Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk/usr/include/sys/ptrace.h:99:42: error: 'caddr_t' has not been declared
>    99 | int     ptrace(int _request, pid_t _pid, caddr_t _addr, int _data);
>       |                                          ^~~
>
> caddr_t is defined in <sys/types.h>, and ptrace(2) documents
>
> SYNOPSIS
>      #include <sys/types.h>
>      #include <sys/ptrace.h>
>
>      int
>      ptrace(int request, pid_t pid, caddr_t addr, int data);
>
>         Rainer
>
> --
> -----------------------------------------------------------------------------
> Rainer Orth, Center for Biotechnology, Bielefeld University
>