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:
Assembler: debugging.cc
"libstdc++-v3/src/c++26/debugging.cc", line 141 : Illegal mnemonic
Near line: " int3"
"libstdc++-v3/src/c++26/debugging.cc", line 141 : Syntax error
Near line: " int3"
I found that both int $0x3 and .byte 0xcc work instead and are also
understood by gas, dis and objdump confirming that they produce the same
results.
Rainer
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Rainer Orth, Center for Biotechnology, Bielefeld University
