The brief structure of libgcc/crtstuff.c is as follows:
#ifdef CRT_BEGIN
…
#elif defined(CRT_END)
...
# ifdef OBJECT_FORMAT_ELF
…
# else
static void
__do_global_ctors_aux (void) /* prologue goes in .text section */
{
asm (__LIBGCC_INIT_SECTION_ASM_OP__);
DO_GLOBAL_CTORS_BODY;
atexit (__do_global_dtors);
} /* epilogue and body go in .init section */
FORCE_CODE_SECTION_ALIGN
asm (__LIBGCC_TEXT_SECTION_ASM_OP__);
#endif // OBJECT_FORMAT_ELF
#else // !CRT_BEGIN && !CRT_END
…
#endif
The __do_global_ctors_aux function shown above is static and without “used”
attribute which result in optimizing out when compiled with optimization. This
currently causes my port failed.
My understanding is that this function is supposed to be split into two parts:
a prologue in .text section and the rest part in .init section. Meanwhile there
is another symmetric function with the same name which is also split into two
parts: an prologue in .init section and the rest part in .text section, which
result in two identical copies of this function, one in .init section and the
other in .text section.
Or is there any other purpose of this code?
Lei
