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This patch provides a new handler MD_ARCH_FRAME_STATE_T to hide an architecture-specific structure containing CIE and FDE data related to DWARF architecture extensions. Hiding the architecture-specific attributes behind a handler has the following benefits: 1. isolating those data from the generic ones in _Unwind_FrameState 2. avoiding casts to custom types. 3. preserving typing information when debugging with GDB, and so facilitating their printing. This approach required to add a new header md-unwind-def.h included at the top of libgcc/unwind-dw2.h, and redirecting to the corresponding architecture header via a symbolic link. An obvious drawback is the increase in complexity with macros, and headers. It also caused a split of architecture definitions between md-unwind-def.h (types definitions used in unwind-dw2.h) and md-unwind.h (local types definitions and handlers implementations). The naming of md-unwind.h with .h extension is a bit misleading as the file is only included in the middle of unwind-dw2.c. Changing this naming would require modification of others backends, which I prefered to abstain from. Overall the benefits are worth the added complexity from my perspective. libgcc/ChangeLog: * Makefile.in: New target for symbolic link to md-unwind-def.h * config.host: New parameter md_unwind_def_header. Set it to aarch64/aarch64-unwind-def.h for AArch64 targets, or no-unwind.h by default. * config/aarch64/aarch64-unwind.h (aarch64_pointer_auth_key): Move to aarch64-unwind-def.h (aarch64_cie_aug_handler): Update. (aarch64_arch_extension_frame_init): Update. (aarch64_demangle_return_addr): Update. * configure.ac: New substitute variable md_unwind_def_header. * unwind-dw2.h (defined): MD_ARCH_FRAME_STATE_T. * config/aarch64/aarch64-unwind-def.h: New file. * configure: Regenerate. * config/no-unwind.h: Updated comment
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