conf/96570: cc can't build 32-bit executables on amd64

[Mikhail T.]

>Number:         96570
>Category:       conf
>Synopsis:       cc can't build 32-bit executables on amd64
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon May 01 01:10:17 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Mikhail T.
>Release:        FreeBSD 6.1-RC amd64
>Organization:
Virtual Estates, Inc.
>Environment:
System: FreeBSD aldan.algebra.com 6.1-RC FreeBSD 6.1-RC #4: Sat Apr 15 14:53:29 EDT 2006 root at aldan.algebra.com:/meow/obj/var/src/sys/SILVER amd64

>Description:

	``cc -m32'' currently succeeds _compiling_, but fails linking
	the program, because it looks for libgcc.a in /usr/lib, where
	it finds the 64-bit flavor.

	This is a shame, because the 32-bit library is built and
	available in /usr/lib32 -- cc just needs to know to look
	there, when given the ``-m32'' flag.

>How-To-Repeat:

	echo 'main() {}' > t.c
	cc -m32 t.c
	/usr/bin/ld: skipping incompatible /usr/lib/libgcc.a when
	searching for -lgcc
	/usr/bin/ld: cannot find -lgcc

>Fix:

	The details of the contrib/gcc/gcc.c appear hairy to a novice
	like myself, but it should not be too difficult for a seasoned
	developer to fix this configuration problem. Or so I think :-)

	Renaming /usr/lib to /usr/lib64 and /usr/lib32 to /usr/lib
	allows creation of 32-bit executables, but, obviously, prevents
	creation of the 64-bit ones (and starting many programs).

	This has been a nuissance since the beginning of the
	FreeBSD/amd64, I guess. It would be nice to see it resolved
	in the upcoming 6.1.
>Release-Note:
>Audit-Trail:
>Unformatted: