Brian Dessent wrote:
> That is a bug report against glibc. You cannot draw any inferences
> between that and newlib/Cygwin because they are totally separate and
> unrelated code bases.
> That would be expected given Lev's indication of a fix in newlib
What I wished to stress was that the 'tgamma' function of newlib gives the
same results of the glibc-tgamma, for which a bug report has been sent.
And this regardless the "Lev's indication of a fix in newlib".
So it looks that the newlib-tgamma has similar problems to that of
glibc-tgamma.
Building the following test case with a recent CVS-GFortran-4.3.0
(that now uses tgamma), the result is
Segment fault with Cygwin-1.5.24-2
fail with Cygwin-snapshot 20070920
fail on GNU/Linux Kubuntu 7.04
Linking it with Cernlib (that has its own gamma implemented), it is
completed successfully.
Cheers,
Angelo.
==========================================================================
!
! gfortran -O0 -funroll-loops -fomit-frame-pointer -fno-second-underscore
! -fno-automatic gfc_gamma_test_c302m.F90 -o gfc_gamma_test_c302m
!
! Uncommenting the lines
!
! !real :: gamma
! !real(DP) :: dgamma
! !external gamma,dgamma
!
! you must build in this way:
!
! gfortran -O0 -funroll-loops -fomit-frame-pointer -fno-second-underscore
! -fno-automatic gfc_gamma_test_c302m.F90 `cernlib -gfc mathlib`
! -o gfc_gamma_test_c302m
!
program gfc_gamma_test_c302m
implicit none
integer, parameter :: LOUT = 10
integer :: ntest = 0
call c302m()
contains
subroutine c302m
implicit none
logical :: ltest=.true.,ltest1=.true.,ltest2=.true.
call header('C302',0)
call c302d(ltest1)
ltest=ltest .and. ltest1
call test_result('C302',ltest)
call pagend('C302')
end subroutine c302m
!
subroutine c302d(ltest1)
implicit none
! implicit double precision (A-H,O-Z)
logical, intent(inout) :: ltest1
!
integer, parameter :: DP = kind(1.D0)
real(DP), parameter :: HALF = 5D-1, PI=3.14159265358979324D0
! Set maximum error allowed for test to be considered successful
real(DP), parameter :: TOL(2) = (/1D-6,5D-14/)
!
integer :: jf,n,nf
character(len=6) :: tfunc(2) = (/'GAMMA ','DGAMMA'/)
real(DP) :: dr,er,etol,errmax,rerrmax,t,x,c(0:20)
!real :: gamma
!real(DP) :: dgamma
!external gamma,dgamma
LTEST1=.true.
c(0)=1
do n = 1,20
c(n)=(2*n-1)*c(n-1)/2
enddo
nf=2
do jf = 1,nf
errmax= 0.0D0
rerrmax= 0.0E0
write(LOUT,'(/10X,''Test of C302 '',A)') tfunc(jf)
write(LOUT,'(/9X,''X '',7X,''Exact'',25X,''Calculated'',&
&14X,''Rel. Error'')')
do n = 1,20
x = n+HALF
t = c(abs(n))*sqrt(PI)
if (jf == 1) then
dr = gamma(sngl(x))
if (dr /= 0) er = abs(sngl(dr-t)/sngl(dr))
write(LOUT,'(1X,F10.1,2E27.9,5X,E10.1)')&
sngl(x),sngl(t),sngl(dr),sngl(er)
endif
if (jf == 2) then
dr = dgamma(x)
if (dr /= 0) er = abs((dr-t)/dr)
write(LOUT,'(1X,F10.1,2E27.18,5X,E10.1)') x,t,dr,er
endif
errmax= max(errmax,er)
enddo
etol = TOL(jf)
write(LOUT,'(/''Largest relative error was'',E10.1)') errmax
ltest1 = ltest1.and.(errmax <= etol)
write(LOUT,'(/''Testing error messages:'')')
if (jf == 1) dr=gamma(-sngl(HALF))
if (jf == 2) dr = dgamma(-HALF)
enddo
return
end subroutine c302d
!
subroutine header(code,mode)
! This routine prints a page header with a testing routine name
! message.
implicit none
character(len=*), intent(in) :: code
integer, intent(in) :: mode
ntest = ntest+1
if(mode == 1) &
write(*,'(" Test#",I3," ( ",A," ): started")') ntest,code
write(LOUT,'("1",25X,30("*")/26X,"** Testing Routine ",A,3X,"**"/&
&26X,30("*"))') code
end subroutine header
!
subroutine pagend(code)
! This subroutine prints a page end message
implicit none
character(len=*), intent(in) :: code
write(LOUT,'(/26X,30("*")/26X,"** End of Test of ",A,3X,"**"/&
&26X,30("*"))') code
end subroutine pagend
!
subroutine test_result(code,test)
character(len=*),intent(in) :: code
logical, intent(in) :: test
character(len=*), parameter ::&
fmt1 = '(" Test#",I3," ( ",A," ): completed successfully")',&
fmt2 = '(" Test#",I3," ( ",A," ): *** failed ***")'
if (test) then
write(*,fmt1) ntest,code
if (LOUT /= 6) write(LOUT,fmt1) ntest,code
else
write(*,fmt2) ntest,code
if (LOUT /= 6) write(LOUT,fmt2) ntest,code
endif
end subroutine test_result
end program
====================================================================
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