topic Re: Misplaced OpenMP directive in Intel® Fortran Compiler

Misplaced OpenMP directive

OP1 — Wed, 27 Aug 2008 18:14:43 GMT

I am puzzled by the compiler error I get with the following part of my subroutine:

...

!$0MP PARALLEL DO DEFAULT(SHARED) PRIVATE(I_NL_SUBSET)

DO I_NL_SUBSET=1,N_NL_SUBSETS
IF (NL_SUBSETS_FLAGS(I_NL_SUBSET)) THEN
CALL SUB_NL_FCN(I_NL_SUBSET,NL_SUBSETS,X_TIME,FNL_TIME,STATE_TIME, &
N_NL_SUBSETS,N_TIME,N_TIME_PLUS_PADDING,N_NL_DOFS,SUB_ERROR)
ENDIF
ENDDO
!$OMP END PARALLEL DO
...

The error message I get is: "Error: Misplaced part of an OpenMP parallel directive", and it points to the END PARALLEL DO directive.

SUB_NL_FCN and SUB_ERRORare declared as EXTERNAL(they are dummy arguments). NL_SUBSET is of a type declared in a module. All other variables areof either REAL(8), INTEGER(4) type, some are arrays, all are dummy arguments passed to the subroutine which contains the parallel region above.

What is wrong here?

Thanks,

Olivier

Re: Misplaced OpenMP directive

jimdempseyatthecove — Wed, 27 Aug 2008 21:02:41 GMT

Olivier,

Try commenting out the two !$OMP statements _without_ touching any of the interviening code.
(Just place a C***Debug*** to the left of each statement/directive)

Then compile and check for errors

The purpose is to test to see if you have a problem with your continuation line. If you do have a problem with your continuation line then some other error will appear (e.g. bad IF statement)

Jim Dempsey

Re: Misplaced OpenMP directive

jimdempseyatthecove — Wed, 27 Aug 2008 21:04:56 GMT

I forgot to mention

In the sample code above the CALL statement is on the left margin. I assume this is not the case in your actual code.

However, if your call statement is located at the left margine then it is not a CALL statement... it is a Comment.

Jim

Re: Misplaced OpenMP directive

TimP — Wed, 27 Aug 2008 21:14:21 GMT

The END PARALLEL DO is superfluous here. If you want an END PARALLEL, you need

!$OMP PARALLEL

!$OMP DO

....

ENDDO

!$OMP END PARALLEL

It's syntactically legal to have CALL starting in column 1 only if you use free form syntax compiler option. However, it's even more important to use a reasonable indentation scheme when using free format, if only to avoid sending yourself and others in chase of red herrings.

Re: Misplaced OpenMP directive

jimdempseyatthecove — Wed, 27 Aug 2008 21:29:41 GMT

Tim

Olivier used a single statement !$OMP PARALLEL DO therefore he needs to end with !$OMP END PARALLEL DO

He did not program to style you mentioned in your post (!$OMP PARALLEL, then !$OMP DO, then code, then !$OMP END DO, then !$OMP END PARALLEL)

Jim Dempsey

Re: Misplaced OpenMP directive

OP1 — Wed, 27 Aug 2008 22:38:43 GMT

Thanks for your help... Actually... I found the mistake I made... nothing to be proud of... after all these years programming in Fortran...

... it's kind of the worse mistake you can make for your own ego...

... I realized that I wrote !$OMP with a 0 (zero) instead of the letter O...

Now, maybe the Fortran compiler could check the syntax of the OpenMP directives, to catch this kind of (really) silly mistake? Dr. Fortran, what do you think?

Justone of these days... so much time wasted for so little...

Olivier

Re: Misplaced OpenMP directive

DavidWhite — Thu, 28 Aug 2008 00:46:05 GMT

Many years ago as an undergraduate, I spelled FORMAT with a 0, to get the apparently meaningless error message "this is not a Fortran statement". Just tried IVF with the same mistake - the compiler messages are not that more informative:

Error1 Error: Missing mandatory separating blank

Error2 Error: Syntax error, found IDENTIFIER 'X' when expecting one of: .EQV. .NEQV. .XOR. .OR. .AND. .LT. < .LE. <= .EQ. == .NE. /= .GT. >

Error3 Error: Syntax error, found END-OF-STATEMENT when expecting one of: => = .

Apart from the lack of colouring in MSVS which shows that "F0RMAT" is not a keyword, I still think it would take a while to work out why the statement won't compile. It seems that 30 years of compiler development still can't account for our stupid mistakes;-)

Re: Misplaced OpenMP directive

Steven_L_Intel1 — Thu, 28 Aug 2008 14:20:23 GMT

The compiler DOES check syntax of OMP directive - but if you misspell the directive introducer, it looks like a comment and is not parsed. This is the downside of directives designed to look like comments.