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Re: What is the meaning of "missing indirect symbols for section (__TEXT, __symbol_stub)"?

On Oct 28, 2006, at 10:32 PM, John Reppy wrote:

I'm trying to help someone port a compiler (http://mlton.org) that generates
x86 assembly code, but we are having difficulty with calls to external C functions.
If we are calling a function _foo directly, we get a error from ld:

external relocation entries in non- writable section (__TEXT,__text) symbols:
_foo

but if we put in a stub as suggested by the "Mac OS X Assembler Reference"

	.symbol_stub
	L_foo_stub:
	.indirect_symbol _foo
		hlt ; hlt ; hlt ; hlt ; hlt

we get the following error from the assembler:

	missing indirect symbols for section (__TEXT,__symbol_stub)

Can someone explain what the root cause of this error message might be?

That Mac OS X Assembler Reference page is out of date. Please file a bug report at <http://bugreport.apple.com/>.

If you look at the assembly output for a simple C file (using gcc - S), you'll see that instead of .symbol_stub the compiler emits this:
.section __IMPORT,__jump_table,symbol_stubs,self_modifying_code +pure_instructions,5
Use that instead and your stub will work.

In other words, when in doubt with your own compiler, look at what a known working compiler does. :)

Hope this helps,
Eric

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 >What is the meaning of "missing indirect symbols for section (__TEXT, __symbol_stub)"? (From: John Reppy <email@hidden>)



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