RTEMS | Draft: Support for building RTEMS with LLVM toolchains (!1539)

[Sebastian Huber (@sebhub)]

Sebastian Huber started a new discussion on cpukit/libdl/rtl-unwind-dw2.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1539#note_161205

 >  void __register_frame(void* begin);
 >  void __deregister_frame(void* begin);
 >  
 > -bool rtems_rtl_elf_unwind_dw2_parse(const rtems_rtl_obj* obj, const char* name,
 > -                                    uint32_t flags) {
 > -  (void)obj;
 > +#if defined(__clang__)

The frame registration depends on the unwinder, not on the compiler. `__register_frame()` of libgcc takes the whole section. `__register_frame()` of the LLVM libunwind takes one FDE. A clang build which links libgcc then registers each FDE separately with libgcc. Please select the code by the unwinder.

Line 46 includes `<string.h>` a second time.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1539#note_161205
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