[Bug libfortran/41169] New: [4.5 regression] libgfortran fails to build on Solaris 10+: '_Imaginary_I' undeclared

["ro at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Probably since the introduction of those two patches

2009-07-27  Tobias Burnus  <burnus@net-b.de>

        PR fortran/40863
        * c99_functions.c: Define complex I, if not defined.
        Create prototypes for C99 functions to silence warnings.
        * gfortran.map: Add missing functions to GFORTRAN_C99_1.0
        and new GFORTRAN_C99_1.1.

2009-07-25  Tobias Burnus  <burnus@net-b.de>

        PR fortran/33197
        * intrinsics/c99_functions.c (cacosf,cacos,cacosl,casinf,
        casin,casind,catanf,catan,catanl,cacoshf,cacosh,cacoshl,
        casinhf,casinh,casinhf,catanhf,catanh,catanhl): New functions.
        * c99_protos.h: Add prototypes for those.

libgfortran fails to build on Solaris 10 and 11:

/vol/gcc/src/gcc-dist/libgfortran/intrinsics/c99_functions.c: In function
'casinf':
/vol/gcc/src/gcc-dist/libgfortran/intrinsics/c99_functions.c:1585:11: error:
'_Imaginary_I' undeclared (first use in this function)
/vol/gcc/src/gcc-dist/libgfortran/intrinsics/c99_functions.c:1585:11: error:
(Each undeclared identifier is reported only once
/vol/gcc/src/gcc-dist/libgfortran/intrinsics/c99_functions.c:1585:11: error:
for each function it appears in.)

and many more such errors.

The problem fails to be twofold: <complex.h> states:

/*
 * Compilation environments for Solaris must provide the _Imaginary datatype
 * and the compiler intrinsics _Complex_I and _Imaginary_I
 */
#define _Complex_I      _Complex_I
#define complex         _Complex
#define _Imaginary_I    _Imaginary_I
#define imaginary       _Imaginary
#undef  I
#define I               _Imaginary_I

but gcc obviously fails to do that.  Maybe this can be worked around with
fixincludes, but until this is fixed somehow, libgfortran needs to work around
the problem.

IRIX 6.5 is very likely affected as well: there, <complex.h> has

#define complex _Complex
#define _Complex_I ((float _Complex) (__I__))
#define imaginary _Imaginary
// #define _Imaginary_I ((float _Imaginary) 1)
#define _Imaginary_I __I__
#define I _Imaginary_I

and __I__ seems to be a compiler builtin.


-- 
           Summary: [4.5 regression] libgfortran fails to build on Solaris
                    10+: '_Imaginary_I' undeclared
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libfortran
        AssignedTo: burnus at gcc dot gnu dot org
        ReportedBy: ro at gcc dot gnu dot org
  GCC host triplet: *-*-solaris2.1[01]


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41169