[PATCH] Fix GDB PR15559 (inferior calls using "thiscall" calling convention)

[Julian Brown]

Hi,

This is the GCC part of my fix for PR15559, the GDB part of which was
posted here:

https://sourceware.org/ml/gdb-patches/2014-03/msg00610.html

Cross-tested (gcc/g++/libstdc++) from Linux to Mingw32: results are the
same, apart from (what I presume to be) noise in guality.exp/pr55665.C.

According to PR15559, this is technically a regression from pre-4.7.0,
so OK either for now, or for stage 1? For other branches?

Thanks,

Julian

ChangeLog

    include/
    * dwarf2.h (enum dwarf_calling_convention): Add
    DW_CC_GNU_thiscall_i386.

    gcc/
    * config/i386/i386.c (ix86_dwarf_calling_convention): New.
    (TARGET_DWARF_CALLING_CONVENTION): Define, using above.
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