assembly - Why does my symbol not have external linkage? -


i'm trying build coro.c using clang+lto (it works fine without lto).

when link final binary, following error:

global external, doesn't have external or weak linkage! void ()* @coro_transfer

the symbol defined in coro.h as:

#if __i386__ || __x86_64__ extern void __attribute__ ((__noinline__, __regparm__(2))) #else extern void __attribute__ ((__noinline__)) #endif coro_transfer (coro_context *prev, coro_context *next);

and in coro.c as:

  asm (        "\t.text\n"        #if _win32 || __cygwin__ || __mach__        "\t.globl _coro_transfer\n"        "_coro_transfer:\n"        #else        "\t.globl coro_transfer\n"        "coro_transfer:\n"        #endif

it seems me have (or should) have global linkage. bug lto, or there wrong assembly definition?

i checked nm , noticed symbol first undefined , defined. guess that's because of declaration in header it's not technically c function in implementation.

coro.c.o:          u abort 00000000 t coro_create 00000000 t coro_stack_alloc 00000000 t coro_stack_free          u coro_transfer 00000000 t coro_transfer          u mmap          u mprotect          u munmap          u sysconf

could causing problem?


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