[Bug fortran/54370] New: error: non-trivial conversion in unary operation

[chilikin.k at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54370

             Bug #: 54370
           Summary: error: non-trivial conversion in unary operation
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: chiliki...@gmail.com


The following:

      MODULE M
      CONTAINS

      LOGICAL(C_BOOL) FUNCTION L() BIND(C)
      USE, INTRINSIC :: ISO_C_BINDING
      L = .FALSE.
      END FUNCTION

      SUBROUTINE S()
      DO WHILE (L())
      ENDDO
      END

      END

(also in attached file)

Results in:

$ gfortran -c test.f08 
test.f08: In function 's':                                                      
test.f08:10:0: error: non-trivial conversion in unary operation                 
logical(kind=4)                                                                 
logical(kind=1)
D.1858 = ~D.1857;

test.f08:10: confused by earlier errors, bailing out

With compiler:

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/gcc-4.7.0/libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --prefix=/opt/gcc-4.7.0/
Thread model: posix
gcc version 4.7.0 (GCC) 

The same error appears in version 4.7.1.

Compilation works in version 4.6.3 without any errors.