> uname -a
Linux loanamd25 2.6.16.46-0.10-smp #1 SMP Mon May 7 13:37:05 UTC 2007 x86_64
x86_64 x86_64 GNU/Linux

> gfortran --version
GNU Fortran (GCC) 4.5.0

> cat f06fkfn.f90
    FUNCTION F06FKFN(N,W,INCW,X,INCX)
       IMPLICIT NONE
       INTEGER, PARAMETER :: WP = KIND(0.0D0)
       REAL (KIND=WP)                  :: F06FKFN
       REAL (KIND=WP), PARAMETER       :: ONE = 1.0E+0_WP
       REAL (KIND=WP), PARAMETER       :: ZERO = 0.0E+0_WP
       INTEGER, INTENT (IN)            :: INCW, INCX, N
       REAL (KIND=WP), INTENT (IN)     :: W(*), X(*)
       REAL (KIND=WP)                  :: ABSYI, NORM, SCALE, SSQ
       INTEGER                         :: I, IW, IX
       REAL (KIND=WP), EXTERNAL        :: F06BMFN
       INTRINSIC                          ABS, SQRT
       IF (N<1) THEN
          NORM = ZERO
       ELSE IF (N==1) THEN
          NORM = SQRT(W(1))*ABS(X(1))
       ELSE
          IF (INCW>0) THEN
             IW = 1
          ELSE
             IW = 1 - (N-1)*INCW
          END IF
          IF (INCX>0) THEN
             IX = 1
          ELSE
             IX = 1 - (N-1)*INCX
          END IF
          SCALE = ZERO
          SSQ = ONE
          DO I = 1, N
             IF ((W(IW)/=ZERO) .AND. (X(IX)/=ZERO)) THEN
                ABSYI = SQRT(W(IW))*ABS(X(IX))
                IF (SCALE<ABSYI) THEN
                   SSQ = 1 + SSQ*(SCALE/ABSYI)**2
                   SCALE = ABSYI
                ELSE
                   SSQ = SSQ + (ABSYI/SCALE)**2
                END IF
             END IF
             IW = IW + INCW
             IX = IX + INCX
          END DO
          NORM = F06BMFN(SCALE,SSQ)
       END IF
       F06FKFN = NORM
       RETURN
    END FUNCTION F06FKFN

> gfortran -O3 -m32 -fcheck=all -c f06fkfn.f90
f06fkfn.f90: In function ‘f06fkfn’:
f06fkfn.f90:1:0: internal compiler error: Segmentation fault


-- 
           Summary: ICE with -fcheck=all
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mathewc at nag dot co dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43796