>Number:         145
>Category:       bin
>Synopsis:       gcc optimizer breaks __ieee754_hypot in libm
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    gnats-admin (Utility Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar  1 11:05:02 1994
>Originator:     Thomas Eberhardt
>Organization:
CeVis, University of Bremen, Germany
>Release:        
>Environment:
	
System: NetBSD ed209 0.9a ED209#0 i386

Machine: i386
>Description:
	Compiling lib/libm/src/e_hypot.c with -O or -O2 gives bad code, i.e.
	it calling hypot gives wrong results.
>How-To-Repeat:
	call hypot(3.0, 4.0)
>Fix:
	Until another release of gcc becomes available that is considered
	stable, compile e_hypot.c without any optimizations:

*** lib/libm/Makefile-	Sat Feb 26 11:55:15 1994
--- lib/libm/Makefile	Tue Mar  1 19:42:52 1994
***************
*** 90,94 ****
--- 90,109 ----
  MLINKS+=lgamma.3 gamma.3
  MLINKS+=sqrt.3 cbrt.3
  
+ e_hypot.o:
+ 	${CC} -D_MULTI_LIBM -D_POSIX_MODE -c ${.IMPSRC}
+ 	@${LD} -x -r ${.TARGET}
+ 	@mv a.out ${.TARGET}
+ 
+ e_hypot.po:
+ 	${CC} -p -D_MULTI_LIBM -D_POSIX_MODE -c ${.IMPSRC} -o ${.TARGET}
+ 	@${LD} -X -r ${.TARGET}
+ 	@mv a.out ${.TARGET}
+ 
+ e_hypot.so:
+ 	${CC} ${PICFLAG} -DPIC -D_MULTI_LIBM -D_POSIX_MODE -c ${.IMPSRC} -o ${.TARGET}
+ 	@${LD} -x -r ${.TARGET}
+ 	@mv a.out ${.TARGET}
+ 
  
  .include <bsd.lib.mk>
>Audit-Trail:
>Unformatted:


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