[Bug math/21660] GCC fails to compile a formula with tgmath.h

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https://sourceware.org/bugzilla/show_bug.cgi?id=21660

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=be3a79a3cc8d8111811a52b0fe243b6f4dd03844

commit be3a79a3cc8d8111811a52b0fe243b6f4dd03844
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Nov 15 02:08:56 2017 +0000

    Use __builtin_tgmath in tgmath.h with GCC 8 (bug 21660).

    GCC mainline now supports __builtin_tgmath to allow <tgmath.h> macro
    implementations that expand their arguments only once, so avoiding
    exponential blowup in the size of macro expansions when calls to those
    macros are nested in arguments to those macros.

    This patch makes glibc's tgmath.h support using __builtin_tgmath, as a
    much simpler and more efficient alternative to the existing
    implementation.  (As a side effect, the new feature would make it much
    more practical to support decimal floating point in <tgmath.h> with
    new compilers; currently, libdfp does not provide a <tgmath.h>
    implementation, and making decimal arguments cause integer arguments
    to be considered of type _Decimal64 instead of double would have been
    very problematic in the old implementation.)

    Tested for x86_64 (with GCC mainline).

        [BZ #21660]
        * math/tgmath.h (__HAVE_BUILTIN_TGMATH): New macro.
        [__HAVE_BUILTIN_TGMATH] (__TG_F16_ARG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TG_F32_ARG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TG_F64_ARG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TG_F128_ARG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TG_F32X_ARG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TG_F64X_ARG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TG_F128X_ARG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_FUNCS): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_RCFUNCS): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_1): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_2): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_2STD): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_3): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_1C): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_2C): Likewise.
        (__tgml): Make conditional on [!__HAVE_BUILTIN_TGMATH].
        (__floating_type): Likewise.
        (__real_integer_type): Likewise.
        (__complex_integer_type): Likewise.
        (__expr_is_real): Likewise.
        (__tgmath_real_type_sub): Likewise.
        (__tgmath_real_type): Likewise.
        (__tgmath_complex_type_sub): Likewise.
        (__tgmath_complex_type): Likewise.
        (__TGMATH_F128): Likewise.
        (__TGMATH_CF128): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_ONLY): Define using
        new macros.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_RET_ONLY): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_FIRST_REAL_ONLY):
        Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_FIRST_REAL_STD_ONLY):
        Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_ONLY): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_STD_ONLY): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_RET_ONLY): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_FIRST_SECOND_REAL_ONLY):
        Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_REAL_ONLY): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_TERNARY_FIRST_REAL_RET_ONLY):
        Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_IMAG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_IMAG): Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_UNARY_REAL_IMAG_RET_REAL):
        Likewise.
        [__HAVE_BUILTIN_TGMATH] (__TGMATH_BINARY_REAL_IMAG): Likewise.
        (__TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME): New macro.
        (carg): Use __TGMATH_UNARY_REAL_IMAG_RET_REAL_SAME.
        (cimag): Likewise.
        (creal): Likewise.

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

Summary of changes:
 ChangeLog     |   55 +++++++++++++++
 math/tgmath.h |  204 +++++++++++++++++++++++++++++++++++++++++----------------
 2 files changed, 202 insertions(+), 57 deletions(-)

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