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Subject: gnu/19882: ld does not detect all undefined symbols!
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>Number:         19882
>Category:       gnu
>Synopsis:       ld does not detect all undefined symbols!
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jul 12 20:10:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Peter Wemm
>Release:        FreeBSD 5.0-CURRENT i386
>Organization:
Not
>Environment:

	Any post 3.0-RELEASE system with a recent binutils.

>Description:

	Certain gas-generated external references to undefined symbols
	are not noticed by ld.  For example:

	andl    $~AST_RESCHED,_astpending

	If AST_RESCHED is undefined (remove the #include <machine/ipl.h>
	in i386/i386/swtch.s to cause this), then the kernel ends up with:

	$ nm kernel | grep AST_
		 U AST_RESCHED


>How-To-Repeat:

	Remove #include <machine/ipl.h> from i386/i386/swtch.s, build a
	kernel.  It will compile and end up with an undefined symbol.
	This was an actual problem in RELENG_4 from May 16th through
	July 12th.  ld(8) did not mention it.  The new binutils has
	a --no-undefined flag, but even that does not detect the undefined
	symbol.

>Fix:

	Unknown.


>Release-Note:
>Audit-Trail:
>Unformatted:


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