[llvm-bugs] [Bug 52152] New: IGNORE_TKR directive with gfortran
llvm-bugs at lists.llvm.org
Tue Oct 12 02:21:02 PDT 2021
Bug ID: 52152
Summary: IGNORE_TKR directive with gfortran
Assignee: unassignedbugs at nondot.org
Reporter: gilles at rist.or.jp
CC: David.Truby at arm.com, jperier at nvidia.com,
kirankumartp at gmail.com, llvm-bugs at lists.llvm.org,
sscalpone at nvidia.com
Created attachment 25356
a reproducer to evidence the issue
The attached conftest.f90 program can be used in order to evidence the issue.
gfortran -c conftest.f90
should work (it can issue a warning related to an type/interface mismatch, but
that can be ignored).
Now the same file fails to compile with flang resulting into an error in the
> Error: Rank mismatch in argument 'buffer' at (1) (rank-1 and scalar)
What happens is the 'buffer' dummy argument of the 'foo' subroutine has the
!GCC$ ATTRIBUTES NO_ARG_CHECK :: buffer
This is GCC specific (as the !GCC$ sentinel implies), and is simply stripped by
Consequently, the flang-processed file contains no such directive and hence
flang offers a similar directive
!DIR$ IGNORE_TKR buffer
that is passed as-is to gfortran.
Unfortunately, gfortran does not understand this directive and the compilation
Of course, one option is to have the fine GNU folks update gfortran to support
Other options at the flang level could be to
- pass through unknown and/or gfortran specific directives
- translate flang to gfortran directives
Will you be willing to consider doing something about that at the flang level?
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