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Compiler bug with fixed form wide source and continued lines

 
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mecej4



Joined: 31 Oct 2006
Posts: 1281

PostPosted: Mon Feb 10, 2020 4:39 pm    Post subject: Compiler bug with fixed form wide source and continued lines Reply with quote

While compiling some old source code in fixed form with many continuation lines and source lines wider than 72 columns, I ran into perplexing responses from FTN95 8.51 (32 and 64 bit). I have prepared a small example to demonstrate the bug.

Code:
      subroutine Jacobian_deg(coef)

      double precision x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,
     1                 x15,x16,x17,x18,x19,x20,
     2                 y1,y2,y3,y4,y5,y6,y7,y8,y9,y10,y11,y12,y13,y14,
     3                 y15,y16,y17,y18,y19,y20,
     4                 z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12,z13,z14,
     5                 z15,z16,z17,z18,z19,z20

      double precision coef(115)
! code to evaluate x1-x20, y1-y20, z1-z20 removed for brevity
      coef(7)=   (x1*y10*z11) - (x1*y11*z10)   - (x10*y1*z11)           + (x10*y11*z1) !only long line in file
     1         - (x11*y10*z1) + (x1*y10*z12)   - (x1*y12*z10)
     2         + (x12*y1*z10) - (x12*y10*z1)   + (x1*y10*z13)
     3         + (x10*y13*z1) + (x13*y1*z10)   - (x13*y10*z1)
     4         - (x10*y1*z14) + (x10*y14*z1)   + (x14*y1*z10)
     5         + (x1*y11*z14) - (x1*y14*z11)   + (x1*y15*z10)
     6         - (x11*y1*z14) + (x11*y14*z1)   + (x14*y1*z11)
     7         + (x15*y10*z1) - (x1*y10*z16)   + (x1*y16*z10)
     8         - (x16*y1*z10) + (x16*y10*z1)   + (x1*y13*z14)
     9         + (x13*y14*z1) + (x14*y1*z13)   - (x14*y13*z1)
     1         - (x12*y1*z16) + (x12*y16*z1)   + (x16*y1*z12)
     2         - (x1*y15*z14) - (x14*y1*z15)   + (x14*y15*z1)
     3         + (x1*y14*z16) - (x1*y16*z14)   - (x14*y1*z16)
     4         - (x16*y14*z1) - (x1*y14*z17)   + (x1*y17*z14)
     5         - (x17*y1*z14) + (x17*y14*z1)   + (x1*y14*z18)
     6         + (x14*y18*z1) + (x18*y1*z14)   - (x18*y14*z1)
     7         - (x1*y17*z16) + (x1*y19*z14)   + (x14*y1*z19)
     8         + (x16*y17*z1) + (x17*y1*z16)   - (x17*y16*z1)
     9         - (x1*y16*z18) + (x1*y18*z16)   + (x16*y1*z18)
     1         + (x18*y16*z1) + (x1*y16*z19)   - (x1*y19*z16)
     2         + (x19*y1*z16) - (x19*y16*z1)   - (x10*y11*z12)
     3         - (x11*y12*z10) - (x12*y10*z11) + (x12*y11*z10)
     4         - (x12*y10*z13) + (x12*y13*z10) + (x13*y10*z12)

      end subroutine Jacobian_deg

When compiled with ftn95 /error_num /64 /ignore 197 298 c7b.f, a warning is issued for the truncated line. If the /no_truncate option is added, we are told:

Code:
R:\lang\FTN95>ftn95 /no_trunc /error_num /64 /ignore 197 298 c7b.f
[FTN95/x64 Ver. 8.51.0 Copyright (c) Silverfrost Ltd 1993-2019]
0012)       coef(7)=   (x1*y10*z11) - (x1*y11*z10)   - (x10*y1*z11)           + (x10*y11*z1) !only long line in file
*** Error 1100: Line is longer than 72 characters (because of /NO_TRUNCATE)
    1 ERROR  [<JACOBIAN_DEG> FTN95 v8.51.0]
*** Compilation failed


Gfortran with the -ffixed-line-length-132 option compiles this with no error.

The FTN95 online documentation says that up to 40 continuation lines can be used. I found while working with the larger source code that it accepts many more, but because of the above bug issued many confusing messages if /no_truncate was specified.
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PaulLaidler
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Joined: 21 Feb 2005
Posts: 6335
Location: Salford, UK

PostPosted: Mon Feb 10, 2020 7:10 pm    Post subject: Reply with quote

I can take a look at this but I suspect that there may be a missunderstanding in what /no_truncate does. Maybe /wide_source is intended.
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mecej4



Joined: 31 Oct 2006
Posts: 1281

PostPosted: Mon Feb 10, 2020 9:14 pm    Post subject: Reply with quote

Thanks, Paul, you are correct: I misunderstood the meaning of the option.

Sorry!
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