Error Cannot Change Attributes Of Use-associated Symbol At 1
Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.3831&r2=1.3832 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gfortran.fortran-torture/compile/name_clash.f90.diff?cvsroot=gcc&r1=NONE&r2=1.1 Comment 12 Tobias Schlüter 2004-06-09 13:09:10 UTC Worked around in the previous commit. call assign(a) ! Open Source libraries Technology PGI Unified Binary MPI Debugging PGI Accelerator with OpenACC Common Compiler Feedback Format CUDA Fortran CUDA-x86 Products HPC Products PGI Workstation PGI Server PGI CDK Cluster Development foo.f90 > module foo > real sin > end module foo > > ! http://megavoid.net/error-cannot/error-cannot-find-symbol-symbol-method-powdouble-double.html
s1.f90 subroutine s1(x) use foo real x intrinsic sin x = sin(x) end subroutine s1 ! We recommend that the save attribute should always be used when pointers and allocatable arrays are allocated in procedures. AND THE COMPILER WON'T CATCH IT ! THEN LATER NULLIFY OR ALLOCATE THE CHILD POINTER call child_construct(x,5) if (associated(x%p)) print *, x%p contains subroutine child_construct(this,len) ! https://gcc.gnu.org/bugzilla/show_bug.cgi?id=13249
Error Cannot Change Attributes Of Use-associated Symbol At 1
In section 11.2.1, the standard seems to say that one can add the > "volatile" attribute to the local instance of an entity accessed via > host association. On some compilers it is possible to set the record length as follows: open(unit=6, recl = 2147483646) On other compilers unit 6 is preconnected and the record length cannot be changed. This is a real suprise to C programmers.
Not to mention a module, once compiled, should contain all the information necessary for the USE statement. ! Explanation The reason is that Fortran 90 allows procedures to be called by name (keyword) arguments. this is a fortran90 style subroutine real, dimension(:) :: a a = a + 1. It is an external procedure whose interface happens to be defined in a module.
When more than one compiler disagrees with my reading of the standard, I tend to doubt myself, so I appreciate the confirmation.--Steve Tue, 14 Jul 2009 13:09:50 GMT Page However, if the interface is left out, the compiler will no longer check whether the arguments of calling procedures agree with the arguments listed in the interface. or allocate(x) ... ! https://gcc.gnu.org/ml/gcc-bugs/2013-05/msg00064.html Leo 2010/10/1 Stephan Kramer
In fact, ibm xlf rejects it, too. this is a fortran90 style subroutine real, dimension(:) :: a a = a + 1. Thanks to Henry Zongaro of IBM for pointing this out. (We never would have figured this one out on our own.) Also, James Giles found a subtle point regarding this example. As a work around, if you put your variables into a common block and then export the common block, it seems to work ok.
In this example, it is permitted to leave out the interface altogether since routines without interfaces are treated as Fortran77 style routines by default. end subroutine second_sub Dangers with Pointers Fortran 90 has 3 ways to implement dynamic memory: Automatic arrays, allocatable arrays, and pointers. Error Cannot Change Attributes Of Use-associated Symbol At 1 So there is no conflict in their declarations and being brought together into the same scoping unit. mytype is assumed to be already nullified or allocated type (mytype), pointer :: this integer, optional, intent(in) :: len if (.not.associated(x)) allocate(x) if (present(len)) then allocate(x%p(len)) x%p = 0.
once pr15481 is fixed." Comment 14 CVS Commits 2004-06-29 18:56:50 UTC Subject: Bug 13249 CVSROOT: /cvs/gcc Module name: gcc Changes by: email@example.com 2004-06-29 18:56:47 Modified files: gcc/fortran : decl.c dump-parse-tree.c gfortran.h check over here subroutine local_pointer(this) real, dimension(:) :: this real, dimension(:), save, pointer :: local_table ! program main use assign_pointer_class type (mytype) :: x real :: a = 0 ! causes the error go away !
I don't recall whether Andy yet implemented the f2003 form of this statement in g95. Leo van Kampenhout lvankampenhout at gmail.com Fri Oct 1 04:05:11 CDT 2010 Next message: [petsc-users] petsc and meshless type method: Forming parallel coefficient matrix Messages sorted by: [ date ] [ Under windows in C the __declspec(dllexport) seems to work without having to specify a .def file. http://megavoid.net/error-cannot/error-cannot-change-visible-onshow-onhide.html program main type mytype real, dimension(:), pointer :: p end type mytype type (mytype), pointer :: x !
Thanks. end subroutine incb If the routine is in a module interfaces are generated automatically and do not need to be explicitly written. ! nullify(x%p) !
A suprise with non-advancing I/O Many people think that the new non-advancing I/O in Fortran 90 is the same as stream I/O in other languages.
In fact, ibm xlf rejects it, too. > Or maybe I don't understand its meaning? Automatic arrays are automatically created on entry and deleted on exit from a procedure, and they are safest and easiest to use. Bug13249 - Error when using COMMON Summary: Error when using COMMON Status: RESOLVED FIXED Alias: None Product: gcc Classification: Unclassified Component: fortran (show other bugs) Version: tree-ssa Importance: P2 normal Target Fix typo in intialization of derived types. (finish_equivalences): Add second argument in call to create_common. (named_common): take 'gfc_symtree' instead of 'gfc_symbol'. (gfc_trans_common): Adapt to new data structures. * trans-decl.c (gfc_create_module_variables): Also
THIS IS THE RIGHT WAY if (present(header)) then if (header) print *, 'This is the header ' endif print *, this end subroutine print_char Explanation The first method is not safe Mon, 06 Jul 2009 06:32:38 GMT Michael Metcal#2 / 5 Questions about Fortran 2003 "volatile" From John Reid: Quote:>> 1. Richard can probably answer this better than I; as he was a member of J3 and editor for the F95/2003 standard. weblink Followup to "Fortran calling "c", and "c" calling Fortran 7.