[Bug math/21685] tgmath.h handling of bit-fields

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https://sourceware.org/bugzilla/show_bug.cgi?id=21685

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2fee621de0776a6e729c3b18c27442e00733f2b2

commit 2fee621de0776a6e729c3b18c27442e00733f2b2
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Aug 2 16:09:01 2017 +0000

    Fix tgmath.h for bit-fields (bug 21685).

    The tgmath.h macros produce errors for bit-field arguments, because
    they apply sizeof and typeof to the arguments.  This patch fixes them
    to use unary + systematically before using sizeof or typeof on
    arguments that might be bit-fields (note that __real__ of a bit-field
    is still a bit-field for this purpose, since it's an lvalue).
    gen-tgmath-tests.py is extended to add tests for this case.

    Tested for x86_64.

        [BZ #21685]
        * math/tgmath.h (__tgmath_real_type): Use unary + on potentially
        bit-field expressions passed to sizeof or typeof.
        [__HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)]
        (__TGMATH_F128): Likewise.
        [__HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)]
        (__TGMATH_CF128): Likewise.
        (__TGMATH_UNARY_REAL_ONLY): Likewise.
        (__TGMATH_UNARY_REAL_RET_ONLY): Likewise.
        (__TGMATH_BINARY_FIRST_REAL_ONLY): Likewise.
        (__TGMATH_BINARY_FIRST_REAL_STD_ONLY): Likewise.
        (__TGMATH_BINARY_REAL_ONLY): Likewise.
        (__TGMATH_BINARY_REAL_STD_ONLY): Likewise.
        (__TGMATH_BINARY_REAL_RET_ONLY): Likewise.
        (__TGMATH_TERNARY_FIRST_SECOND_REAL_ONLY): Likewise.
        (__TGMATH_TERNARY_REAL_ONLY): Likewise.
        (__TGMATH_TERNARY_FIRST_REAL_RET_ONLY): Likewise.
        (__TGMATH_UNARY_REAL_IMAG): Likewise.
        (__TGMATH_UNARY_IMAG): Likewise.
        (__TGMATH_UNARY_REAL_IMAG_RET_REAL): Likewise.
        (__TGMATH_BINARY_REAL_IMAG): Likewise.
        * math/gen-tgmath-tests.py (Type.init_types): Create bit_field
        type.
        (define_vars_for_type): Handle bit_field type specially.
        (Tests.__init__): Declare structure with bit-field element.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                |   28 +++++++++++
 math/gen-tgmath-tests.py |   12 ++++-
 math/tgmath.h            |  118 +++++++++++++++++++++++-----------------------
 3 files changed, 98 insertions(+), 60 deletions(-)

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