mecej4
Joined: 31 Oct 2006
Posts: 1897
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 Posted: Sat Mar 25, 2023 2:19 am Post subject: Error messages do not quite point to the error |
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In the following source code, I had left out the END SUBROUTINE statement for the CONTAINed subroutine just before the last line.
| Code: | ! Utility for taking routines declared as untyped externals in
! SLATEC sources, and checking if they are implicitly typed
! external functions or are actually subroutines
program scanfuncs
implicit none
integer, parameter :: NFUN = 500
character(10) fnames(NFUN)
character(150) line,linetrim
character(10) rname
integer i,ll,iw,lu,ib,ie,nf
logical found
!
open(11,file='funcs.txt',status='old')
do i=1, NFUN
read(11,'(A)',end=10) fnames(i)
end do
10 close(11)
open(11,file='exts.txt',status='old')
rewind(11)
nf = i-1
print *,nf,' functions recognized'
do
read (11,'(A)',end = 100) line
ll = len_trim(line)
iw = index(line,'external')
if(iw == 0)iw = index(line,'EXTERNAL') ! will miss if mixed case in input!
if (iw /= 0) then
linetrim = line(iw+9:ll) // ','
lu = len_trim(linetrim)
ib = 1
do
ie = index(linetrim(ib:lu),',')
if(ie==0)then
print *,line
print *,linetrim
stop 'Error, no comma found at end'
endif
ie = ie+ib-1
rname = linetrim(ib:ie-1)
call search(rname,fnames,nf,found) !print *,rname
if(found)then
print *,' Input Line:'
print '(8x,A,/)',line
endif
ib=ie+2
if(ib > lu)exit
end do
else
print *,'"external" not found in line: '
print *,line
endif
end do
100 close(11)
stop
contains
!Could use binary search, but linear search is fast enough
subroutine search(rname,fnames,nf,found)
integer, intent(in) :: nf
character(10), intent(in) :: fnames(nf)
character(10), intent(in) :: rname
logical, intent(out) :: found
integer i
found = .false.
do i=1,nf
if(rname .eq. fnames(i))then
print 10,trim(rname)
found = .true.
endif
end do
return
10 format('Routine ',A,' is a known function')
! end subroutine ! commented out to display compiler behaviour
end program
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The compiler output error messages that had me confused for a few moments.
| Code: | ERROR S:\ALGO\slatec\IBED\src\hide\scanfnc.F90 15: FNAMES appears on the left hand side of an assignment yet has the INTENT(IN) attribute
ERROR S:\ALGO\slatec\IBED\src\hide\scanfnc.F90 20: NF appears on the left hand side of an assignment yet has the INTENT(IN) attribute
ERROR S:\ALGO\slatec\IBED\src\hide\scanfnc.F90 39: RNAME appears on the left hand side of an assignment yet has the INTENT(IN) attribute
ERROR S:\ALGO\slatec\IBED\src\hide\scanfnc.F90 40: Compilation abandoned |
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