round.m4

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Hash : 86a9695e
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Date : 2023-02-17T16:24:34

Improve cross-compilation from midipix.

Reported by Ørjan Malde <red@foxi.me> at
<https://lists.gnu.org/archive/html/bug-gnulib/2023-02/msg00131.html>.

Since midipix consists of musl libc based on an emulation of Linux system
calls, for pure libc functionality it can be treated like musl libc.

* m4/calloc.m4 (_AC_FUNC_CALLOC_IF): Treat midipix like systems with
musl libc.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): Likewise.
* m4/ceil.m4 (gl_FUNC_CEIL): Likewise.
* m4/ceilf.m4 (gl_FUNC_CEILF): Likewise.
* m4/ceill.m4 (gl_FUNC_CEILL): Likewise.
* m4/exp2l.m4 (gl_FUNC_EXP2L): Likewise.
* m4/expl.m4 (gl_FUNC_EXPL): Likewise.
* m4/expm1.m4 (gl_FUNC_EXPM1): Likewise.
* m4/expm1f.m4 (gl_FUNC_EXPM1F): Likewise.
* m4/expm1l.m4 (gl_FUNC_EXPM1L): Likewise.
* m4/fclose.m4 (gl_FUNC_FCLOSE_STDIN): Likewise.
* m4/fdopendir.m4 (gl_FUNC_FDOPENDIR): Likewise.
* m4/ffsll.m4 (gl_FUNC_FFSLL): Likewise.
* m4/floor.m4 (gl_FUNC_FLOOR): Likewise.
* m4/floorf.m4 (gl_FUNC_FLOORF): Likewise.
* m4/fmod.m4 (gl_FUNC_FMOD): Likewise.
* m4/fmodf.m4 (gl_FUNC_FMODF): Likewise.
* m4/fmodl.m4 (gl_FUNC_FMODL): Likewise.
* m4/fnmatch.m4 (gl_FUNC_FNMATCH_POSIX): Likewise.
* m4/fopen.m4 (gl_FUNC_FOPEN_GNU): Likewise.
* m4/fpurge.m4 (gl_FUNC_FPURGE): Likewise.
* m4/getdelim.m4 (gl_FUNC_GETDELIM): Likewise.
* m4/getline.m4 (gl_FUNC_GETLINE): Likewise.
* m4/hypot.m4 (gl_FUNC_HYPOT): Likewise.
* m4/hypotf.m4 (gl_FUNC_HYPOTF): Likewise.
* m4/hypotl.m4 (gl_FUNC_HYPOTL): Likewise.
* m4/iconv_open-utf.m4 (gl_FUNC_ICONV_OPEN_UTF_SUPPORT): Likewise.
* m4/log.m4 (gl_FUNC_LOG): Likewise.
* m4/log10.m4 (gl_FUNC_LOG10): Likewise.
* m4/log10f.m4 (gl_FUNC_LOG10F): Likewise.
* m4/log10l.m4 (gl_FUNC_LOG10L_WORKS): Likewise.
* m4/log1p.m4 (gl_FUNC_LOG1P): Likewise.
* m4/log1pf.m4 (gl_FUNC_LOG1PF): Likewise.
* m4/log1pl.m4 (gl_FUNC_LOG1PL, gl_FUNC_LOG1PL_WORKS): Likewise.
* m4/log2.m4 (gl_FUNC_LOG2): Likewise.
* m4/log2f.m4 (gl_FUNC_LOG2F): Likewise.
* m4/log2l.m4 (gl_FUNC_LOG2L_WORKS): Likewise.
* m4/logf.m4 (gl_FUNC_LOGF): Likewise.
* m4/logl.m4 (gl_FUNC_LOGL_WORKS): Likewise.
* m4/malloc.m4 (_AC_FUNC_MALLOC_IF): Likewise.
* m4/mkstemp.m4 (gl_FUNC_MKSTEMP): Likewise.
* m4/modf.m4 (gl_FUNC_MODF): Likewise.
* m4/modff.m4 (gl_FUNC_MODFF): Likewise.
* m4/modfl.m4 (gl_FUNC_MODFL): Likewise.
* m4/musl.m4 (gl_MUSL_LIBC): Likewise.
* m4/perror.m4 (gl_FUNC_PERROR): Likewise.
* m4/posix_spawn.m4 (gl_POSIX_SPAWN_SECURE,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN): Likewise.
* m4/printf.m4 (gl_PRINTF_SIZES_C99, gl_PRINTF_INFINITE,
gl_PRINTF_INFINITE_LONG_DOUBLE, gl_PRINTF_DIRECTIVE_A,
gl_PRINTF_DIRECTIVE_F, gl_PRINTF_FLAG_ZERO, gl_SNPRINTF_TRUNCATION_C99,
gl_SNPRINTF_RETVAL_C99, gl_SNPRINTF_DIRECTIVE_N,
gl_VSNPRINTF_ZEROSIZE_C99): Likewise.
* m4/pthread_rwlock_rdlock.m4 (gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER):
Likewise.
* m4/putenv.m4 (gl_FUNC_PUTENV): Likewise.
* m4/realloc.m4 (_AC_FUNC_REALLOC_IF): Likewise.
* m4/remainder.m4 (gl_FUNC_REMAINDER): Likewise.
* m4/remainderf.m4 (gl_FUNC_REMAINDERF): Likewise.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL, gl_FUNC_REMAINDERL_WORKS):
Likewise.
* m4/rintl.m4 (gl_FUNC_RINTL): Likewise.
* m4/round.m4 (gl_FUNC_ROUND): Likewise.
* m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise.
* m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise.
* m4/setenv.m4 (gl_FUNC_SETENV): Likewise.
* m4/setlocale_null.m4 (gl_FUNC_SETLOCALE_NULL): Likewise.
* m4/signbit.m4 (gl_SIGNBIT): Likewise.
* m4/stpncpy.m4 (gl_FUNC_STPNCPY): Likewise.
* m4/strerror.m4 (gl_FUNC_STRERROR, gl_FUNC_STRERROR_0): Likewise.
* m4/strtod.m4 (gl_FUNC_STRTOD): Likewise.
* m4/strtold.m4 (gl_FUNC_STRTOLD): Likewise.
* m4/trunc.m4 (gl_FUNC_TRUNC): Likewise.
* m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise.
* m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise.
* m4/ungetc.m4 (gl_FUNC_UNGETC_WORKS): Likewise.
* m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Likewise.

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m4/round.m4

# round.m4 serial 24
dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_ROUND],
[
  m4_divert_text([DEFAULTS], [gl_round_required=plain])
  AC_REQUIRE([gl_MATH_H_DEFAULTS])

  dnl Persuade glibc <math.h> to declare round().
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

  gl_CHECK_MATH_LIB([ROUND_LIBM], [x = round (x);],
    [extern
     #ifdef __cplusplus
     "C"
     #endif
     double round (double);
    ])
  if test "$ROUND_LIBM" != missing; then
    HAVE_ROUND=1
    dnl Also check whether it's declared.
    dnl IRIX 6.5 has round() in libm but doesn't declare it in <math.h>.
    AC_CHECK_DECLS([round], , [HAVE_DECL_ROUND=0], [[#include <math.h>]])

    dnl Test whether round() produces correct results. On NetBSD 3.0, for
    dnl x = 1/2 - 2^-54, the system's round() returns a wrong result.
    AC_REQUIRE([AC_PROG_CC])
    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
    AC_CACHE_CHECK([whether round works], [gl_cv_func_round_works],
      [
        save_LIBS="$LIBS"
        LIBS="$LIBS $ROUND_LIBM"
        AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <float.h>
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
double round (double);
#if defined _MSC_VER && !defined __clang__
# pragma fenv_access (off)
#endif
int main()
{
  /* 2^DBL_MANT_DIG.  */
  static const double TWO_MANT_DIG =
    /* Assume DBL_MANT_DIG <= 5 * 31.
       Use the identity
       n = floor(n/5) + floor((n+1)/5) + ... + floor((n+4)/5).  */
    (double) (1U << (DBL_MANT_DIG / 5))
    * (double) (1U << ((DBL_MANT_DIG + 1) / 5))
    * (double) (1U << ((DBL_MANT_DIG + 2) / 5))
    * (double) (1U << ((DBL_MANT_DIG + 3) / 5))
    * (double) (1U << ((DBL_MANT_DIG + 4) / 5));
  volatile double x = 0.5 - 0.5 / TWO_MANT_DIG;
  return (x < 0.5 && round (x) != 0.0);
}]])], [gl_cv_func_round_works=yes], [gl_cv_func_round_works=no],
        [case "$host_os" in
           netbsd* | aix*) gl_cv_func_round_works="guessing no" ;;
                           # Guess yes on MSVC, no on mingw.
           mingw*)         AC_EGREP_CPP([Known], [
#ifdef _MSC_VER
 Known
#endif
                             ],
                             [gl_cv_func_round_works="guessing yes"],
                             [gl_cv_func_round_works="guessing no"])
                           ;;
           *)              gl_cv_func_round_works="guessing yes" ;;
         esac
        ])
        LIBS="$save_LIBS"
      ])
    case "$gl_cv_func_round_works" in
      *no) REPLACE_ROUND=1 ;;
    esac

    m4_ifdef([gl_FUNC_ROUND_IEEE], [
      if test $gl_round_required = ieee && test $REPLACE_ROUND = 0; then
        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
        AC_CACHE_CHECK([whether round works according to ISO C 99 with IEC 60559],
          [gl_cv_func_round_ieee],
          [
            save_LIBS="$LIBS"
            LIBS="$LIBS $ROUND_LIBM"
            AC_RUN_IFELSE(
              [AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
double round (double);
]gl_DOUBLE_MINUS_ZERO_CODE[
]gl_DOUBLE_SIGNBIT_CODE[
static double dummy (double f) { return 0; }
int main (int argc, char *argv[])
{
  double (* volatile my_round) (double) = argc ? round : dummy;
  /* Test whether round (-0.0) is -0.0.  */
  if (signbitd (minus_zerod) && !signbitd (my_round (minus_zerod)))
    return 1;
  return 0;
}
              ]])],
              [gl_cv_func_round_ieee=yes],
              [gl_cv_func_round_ieee=no],
              [case "$host_os" in
                                     # Guess yes on glibc systems.
                 *-gnu* | gnu*)      gl_cv_func_round_ieee="guessing yes" ;;
                                     # Guess yes on musl systems.
                 *-musl* | midipix*) gl_cv_func_round_ieee="guessing yes" ;;
                                     # Guess yes on MSVC, no on mingw.
                 mingw*)             AC_EGREP_CPP([Known], [
#ifdef _MSC_VER
 Known
#endif
                                       ],
                                       [gl_cv_func_round_ieee="guessing yes"],
                                       [gl_cv_func_round_ieee="guessing no"])
                                     ;;
                                     # If we don't know, obey --enable-cross-guesses.
                 *)                  gl_cv_func_round_ieee="$gl_cross_guess_normal" ;;
               esac
              ])
            LIBS="$save_LIBS"
          ])
        case "$gl_cv_func_round_ieee" in
          *yes) ;;
          *) REPLACE_ROUND=1 ;;
        esac
      fi
    ])
  else
    HAVE_ROUND=0
    HAVE_DECL_ROUND=0
  fi
  if test $HAVE_ROUND = 0 || test $REPLACE_ROUND = 1; then
    dnl Find libraries needed to link lib/round.c.
    gl_FUNC_FLOOR_LIBS
    gl_FUNC_CEIL_LIBS
    ROUND_LIBM=
    dnl Append $FLOOR_LIBM to ROUND_LIBM, avoiding gratuitous duplicates.
    case " $ROUND_LIBM " in
      *" $FLOOR_LIBM "*) ;;
      *) ROUND_LIBM="$ROUND_LIBM $FLOOR_LIBM" ;;
    esac
    dnl Append $CEIL_LIBM to ROUND_LIBM, avoiding gratuitous duplicates.
    case " $ROUND_LIBM " in
      *" $CEIL_LIBM "*) ;;
      *) ROUND_LIBM="$ROUND_LIBM $CEIL_LIBM" ;;
    esac
  fi
  AC_SUBST([ROUND_LIBM])
])

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kc3-lang/gnulib/m4/round.m4

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m4/round.m4