[petsc-dev] Fix errors for petsc-3.7.3/petsc/src/ts/examples/tutorials/ex29.c

[Barry Smith]

  Thanks for reporting this. Yes variables named I is not allowed in C code :-) I have fixed the example in the master branch.

  Barry

> On Sep 7, 2016, at 2:37 PM, Lulu Liu <lulu.liu at kaust.edu.sa> wrote:
> 
> When I try to make ex29 in the directory /petsc-3.7.3/petsc/src/ts/examples/tutorials/,  it shows following errors. It seems that we need to  define Mat J (or other names)  instead of Mat I). Thanks!
> 
> 
> /Users/lulu/petsc/petsc-3.7.3/petsc/src/ts/examples/tutorials/ex29.c:42:18: error: 
>       expected identifier or '('
>   Mat            I;
> /usr/include/complex.h:42:11: note: expanded from macro 'I'
> #define I _Complex_I
>           ^
> /usr/include/complex.h:40:21: note: expanded from macro '_Complex_I'
> #define _Complex_I (__extension__ 1.0iF)
>                     ^
> /Users/lulu/petsc/petsc-3.7.3/petsc/src/ts/examples/tutorials/ex29.c:42:18: error: 
>       expected ')'
> /usr/include/complex.h:42:11: note: expanded from macro 'I'
> #define I _Complex_I
>           ^
> /usr/include/complex.h:40:21: note: expanded from macro '_Complex_I'
> #define _Complex_I (__extension__ 1.0iF)
>                     ^
> /Users/lulu/petsc/petsc-3.7.3/petsc/src/ts/examples/tutorials/ex29.c:42:18: note: 
>       to match this '('
> /usr/include/complex.h:42:11: note: expanded from macro 'I'
> #define I _Complex_I
>           ^
> /usr/include/complex.h:40:20: note: expanded from macro '_Complex_I'
> #define _Complex_I (__extension__ 1.0iF)
>                    ^
> /Users/lulu/petsc/petsc-3.7.3/petsc/src/ts/examples/tutorials/ex29.c:58:41: error: 
>       cannot take the address of an rvalue of type '_Complex float'
>   ierr = DMCreateInterpolation(cdmc,cdm,&I,&vscale);CHKERRQ(ierr);
>                                         ^~
> /Users/lulu/petsc/petsc-3.7.3/petsc/src/ts/examples/tutorials/ex29.c:59:22: error: 
>       passing '_Complex float' to parameter of incompatible type 'Mat'
>       (aka 'struct _p_Mat *')
>   ierr = MatRestrict(I,c,cc);CHKERRQ(ierr);
>                      ^
> /usr/include/complex.h:42:11: note: expanded from macro 'I'
> #define I _Complex_I
>           ^~~~~~~~~~
> /usr/include/complex.h:40:20: note: expanded from macro '_Complex_I'
> #define _Complex_I (__extension__ 1.0iF)
>                    ^~~~~~~~~~~~~~~~~~~~~
> /Users/lulu/petsc/petsc-3.7.3/petsc/include/petscmat.h:557:44: note: passing
>       argument to parameter here
> PETSC_EXTERN PetscErrorCode MatRestrict(Mat,Vec,Vec);
>                                            ^
> /Users/lulu/petsc/petsc-3.7.3/petsc/src/ts/examples/tutorials/ex29.c:62:21: error: 
>       cannot take the address of an rvalue of type '_Complex float'
>   ierr = MatDestroy(&I);CHKERRQ(ierr);
>                     ^~
> 5 errors generated.
> make: *** [ex29.o] Error 1
> 
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