Question

当我使用f2c编译以下文件时，它失败并显示非信息语法错误消息

f2c  < ../../libcruft/blas-xtra/ddot3.f >ddot3.c
   ddot3:
Error on line 37: syntax error

gfortran编译它没有任何错误。你知道是什么原因引起的吗？您是否知道任何严格为f2c且具有良好错误消息的fortran编译器？

有问题的文件：

c Copyright (C) 2009-2012  VZLU Prague, a.s., Czech Republic
c
c Author: Jaroslav Hajek <highegg@gmail.com>
c
c This file is part of Octave.
c
c Octave is free software; you can redistribute it and/or modify
c it under the terms of the GNU General Public License as published by
c the Free Software Foundation; either version 3 of the License, or
c (at your option) any later version.
c
c This program is distributed in the hope that it will be useful,
c but WITHOUT ANY WARRANTY; without even the implied warranty of
c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
c GNU General Public License for more details.
c
c You should have received a copy of the GNU General Public License
c along with this software; see the file COPYING.  If not, see
c <http://www.gnu.org/licenses/>.
c
      subroutine ddot3(m,n,k,a,b,c)
c purpose:      a 3-dimensional dot product.
c               c = sum (a .* b, 2), where a and b are 3d arrays.
c arguments:
c m,n,k (in)    the dimensions of a and b
c a,b (in)      double prec. input arrays of size (m,k,n)
c c (out)       double prec. output array, size (m,n)
      integer m,n,k,i,j,l
      double precision a(m,k,n),b(m,k,n)
      double precision c(m,n)

      double precision ddot
      external ddot


c quick return if possible.
      if (m <= 0 .or. n <= 0) return

      if (m == 1) then
c the column-major case.
        do j = 1,n
          c(1,j) = ddot(k,a(1,1,j),1,b(1,1,j),1)
        end do
      else
c We prefer performance here, because that's what we generally
c do by default in reduction functions. Besides, the accuracy
c of xDOT is questionable. Hence, do a cache-aligned nested loop.
        do j = 1,n
          do i = 1,m
            c(i,j) = 0d0
          end do
          do l = 1,k
            do i = 1,m
              c(i,j) = c(i,j) + a(i,l,j)*b(i,l,j)
            end do
          end do
        end do
      end if

      end subroutine

Answer 1

我相信f2c期望阅读FORTRAN77和行

if (m <= 0 .or. n <= 0) return

使用Fortran 90中引入的令牌（ ie <=）。尝试将行更改为

if (m .le. 0 .or. n .le. 0) return

我希望如果这样可以解决问题，f2c接下来会抱怨==这也是Fortran 90的介绍。

如果您是f2c的粉丝，请不要继续阅读。

至于你知道任何fortran编译器会严格像f2c并且有很好的错误信息吗？你开玩笑吧？ f2c是一个过时的插入你最喜欢的中度到严重不赞成的术语这可能是一个坏主意，早在1990年首次发布时。现在，Fortran和C之间的互操作性是（a）标准化的，并且（b）比以前更容易，我认为没有充分的理由使用它。

如果（m <= 0。或.n＆lt; = 0）返回，则行上的语法错误

1 个答案: