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Date: Mon, 3 Jun 1996 18:12:27 -0600 (MDT)
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Subject: bin/1289: errno breaks in thread-safe c++ compiles
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>Number:         1289
>Category:       bin
>Synopsis:       errno breaks in thread-safe c++ compiles
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jun  3 17:20:01 PDT 1996
>Last-Modified:
>Originator:     Steve Passe
>Organization:
New Ideas
>Release:        FreeBSD 2.2-960501-SNAP i386
>Environment:

	FreeBSD 2.2-960501-SNAP, thread safe libc_r

>Description:

	In the thread-safe libc, specifically errno.h, there is a
	mechanism for using a unique copy of errno for each thread.
	This mechanism breaks when a progam compliled under c++
	uses errno (includes errno.h)

>How-To-Repeat:

	foo.cc:
		#include <errno.h>
		cerr << "problem: " << errno << '\n';
	g++ foo.cc:
		(mumbles about unresolvedfunction "__error__Fv")

>Fix:
	
	RCS file: RCS/errno.h,v
	retrieving revision 1.1
	diff -r1.1 errno.h
	47c47,49
	< extern	int *		__error();
	---
	> __BEGIN_DECLS
	> int * __error __P((void));
	> __END_DECLS

>Audit-Trail:
>Unformatted: