log2.m4

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Hash : a923e066
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Date : 2025-09-10T22:55:08

math-h: Remove support for IRIX.

* lib/math.in.h (FP_ILOGB0, FP_ILOGBNAN): Remove code for IRIX.
(cbrtf): Test HAVE_CBRTF instead of HAVE_DECL_CBRTF.
(cbrtl): Test HAVE_CBRTL instead of HAVE_DECL_CBRTL.
(copysignf): Test HAVE_COPYSIGNF instead of HAVE_DECL_COPYSIGNF.
(exp2f): Test HAVE_EXP2F instead of HAVE_DECL_EXP2F.
(exp2): Test HAVE_EXP2 instead of HAVE_DECL_EXP2.
(exp2l): Test HAVE_EXP2L instead of HAVE_DECL_EXP2L.
(expm1l): Test HAVE_EXPM1L instead of HAVE_DECL_EXPM1L.
(log2f): Test HAVE_LOG2F instead of HAVE_DECL_LOG2F.
(log2): Test HAVE_LOG2 instead of HAVE_DECL_LOG2.
(log2l): Test HAVE_LOG2L instead of HAVE_DECL_LOG2L.
(remainder): Don't test HAVE_DECL_REMAINDER.
(remainderl): Test HAVE_REMAINDERL instead of HAVE_DECL_REMAINDERL.
(rintf): Test HAVE_RINTF instead of HAVE_DECL_RINTF.
(roundf): Test HAVE_ROUNDF instead of HAVE_DECL_ROUNDF.
(round): Test HAVE_ROUND instead of HAVE_DECL_ROUND.
(roundl): Test HAVE_ROUNDL instead of HAVE_DECL_ROUNDL.
(isnanf, isnand): Remove code for IRIX.
* m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize HAVE_COPYSIGNF,
HAVE_EXP2, HAVE_EXP2F, HAVE_EXP2L, HAVE_EXPM1L, HAVE_LOG2, HAVE_LOG2F,
HAVE_LOG2L, HAVE_REMAINDERL, HAVE_RINTF, HAVE_ROUND, HAVE_ROUNDF,
HAVE_ROUNDL. Don't initialize HAVE_DECL_CBRTF, HAVE_DECL_CBRTL,
HAVE_DECL_COPYSIGNF, HAVE_DECL_EXP2, HAVE_DECL_EXP2F, HAVE_DECL_EXP2L,
HAVE_DECL_EXPM1L, HAVE_DECL_LOG2, HAVE_DECL_LOG2F, HAVE_DECL_LOG2L,
HAVE_DECL_REMAINDER, HAVE_DECL_REMAINDERL, HAVE_DECL_RINTF,
HAVE_DECL_ROUND, HAVE_DECL_ROUNDF, HAVE_DECL_ROUNDL.
* modules/math-h (Makefile.am): Substitute HAVE_COPYSIGNF, HAVE_EXP2,
HAVE_EXP2F, HAVE_EXP2L, HAVE_EXPM1L, HAVE_LOG2, HAVE_LOG2F, HAVE_LOG2L,
HAVE_REMAINDERL, HAVE_RINTF, HAVE_ROUND, HAVE_ROUNDF, HAVE_ROUNDL.
Don't substitute HAVE_DECL_CBRTF, HAVE_DECL_CBRTL, HAVE_DECL_COPYSIGNF,
HAVE_DECL_EXP2, HAVE_DECL_EXP2F, HAVE_DECL_EXP2L, HAVE_DECL_EXPM1L,
HAVE_DECL_LOG2, HAVE_DECL_LOG2F, HAVE_DECL_LOG2L, HAVE_DECL_REMAINDER,
HAVE_DECL_REMAINDERL, HAVE_DECL_RINTF, HAVE_DECL_ROUND,
HAVE_DECL_ROUNDF, HAVE_DECL_ROUNDL.
* m4/cbrtf.m4 (gl_FUNC_CBRTF_WORKS): Remove macro.
(gl_FUNC_CBRTF): Don't invoke it. Don't set HAVE_DECL_CBRTF.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): Don't set HAVE_DECL_CBRTL. Remove test
regarding cbrtl (-0.0L).
* lib/cbrtl.c (cbrtl): Remove code for IRIX.
* m4/copysignf.m4 (gl_FUNC_COPYSIGNF): Don't set HAVE_DECL_COPYSIGNF.
* m4/exp2f.m4 (gl_FUNC_EXP2F): Don't set HAVE_DECL_EXP2F.
* m4/exp2.m4 (gl_FUNC_EXP2): Don't set HAVE_DECL_EXP2.
* m4/exp2l.m4 (gl_FUNC_EXP2L): Don't set HAVE_DECL_EXP2L. Remove code
for IRIX. Remove test regarding exp2l (-Inf).
* m4/expm1l.m4 (gl_FUNC_EXPM1L): Don't set HAVE_DECL_EXPM1L. Remove code
for IRIX.
* m4/log2f.m4 (gl_FUNC_LOG2F): Don't set HAVE_DECL_LOG2F.
* m4/log2.m4 (gl_FUNC_LOG2): Don't set HAVE_DECL_LOG2.
* lib/log2.c (log2): Remove code for IRIX.
* m4/log2l.m4 (gl_FUNC_LOG2L): Don't set HAVE_DECL_LOG2L. Remove code
for IRIX.
* lib/log2l.c (log2l): Remove code for IRIX.
* m4/remainder.m4 (gl_FUNC_REMAINDER): Don't set HAVE_DECL_REMAINDER.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL): Don't set HAVE_DECL_REMAINDERL.
Remove code for IRIX.
* m4/rintf.m4 (gl_FUNC_RINTF): Don't set HAVE_DECL_RINTF.
* m4/roundf.m4 (gl_FUNC_ROUNDF): Don't set HAVE_DECL_ROUNDF.
* m4/round.m4 (gl_FUNC_ROUND): Don't set HAVE_DECL_ROUND.
* m4/roundl.m4 (gl_FUNC_ROUNDL): Don't set HAVE_DECL_ROUNDL.

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m4/log2.m4

# log2.m4
# serial 17
dnl Copyright (C) 2010-2025 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.
dnl This file is offered as-is, without any warranty.

AC_DEFUN([gl_FUNC_LOG2],
[
  m4_divert_text([DEFAULTS], [gl_log2_required=plain])
  AC_REQUIRE([gl_MATH_H_DEFAULTS])

  dnl Persuade glibc <math.h> to declare log2().
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

  dnl Determine LOG2_LIBM.
  gl_COMMON_DOUBLE_MATHFUNC([log2])

  dnl Test whether log2() exists.
  saved_LIBS="$LIBS"
  LIBS="$LIBS $LOG2_LIBM"
  gl_CHECK_FUNCS_ANDROID([log2], [[#include <math.h>]])
  LIBS="$saved_LIBS"
  if test $ac_cv_func_log2 = yes; then
    HAVE_LOG2=1

    saved_LIBS="$LIBS"
    LIBS="$LIBS $LOG2_LIBM"
    gl_FUNC_LOG2_WORKS
    LIBS="$saved_LIBS"
    case "$gl_cv_func_log2_works" in
      *yes) ;;
      *) REPLACE_LOG2=1 ;;
    esac

    m4_ifdef([gl_FUNC_LOG2_IEEE], [
      if test $gl_log2_required = ieee && test $REPLACE_LOG2 = 0; then
        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
        AC_CACHE_CHECK([whether log2 works according to ISO C 99 with IEC 60559],
          [gl_cv_func_log2_ieee],
          [
            saved_LIBS="$LIBS"
            LIBS="$LIBS $LOG2_LIBM"
            AC_RUN_IFELSE(
              [AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
#ifndef log2 /* for Cygwin 1.7.x */
extern
#ifdef __cplusplus
"C"
#endif
double log2 (double);
#endif
/* Compare two numbers with ==.
   This is a separate function in order to disable compiler optimizations.  */
static int
numeric_equal (double x, double y)
{
  return x == y;
}
static double dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
  double (* volatile my_log2) (double) = argc ? log2 : dummy;
  /* Test log2(negative).
     This test fails on NetBSD 5.1 and Solaris 10/x86_64.  */
  double y = my_log2 (-1.0);
  if (numeric_equal (y, y))
    return 1;
  return 0;
}
              ]])],
              [gl_cv_func_log2_ieee=yes],
              [gl_cv_func_log2_ieee=no],
              [case "$host_os" in
                                     # Guess yes on glibc systems.
                 *-gnu* | gnu*)      gl_cv_func_log2_ieee="guessing yes" ;;
                                     # Guess yes on musl systems.
                 *-musl* | midipix*) gl_cv_func_log2_ieee="guessing yes" ;;
                                     # Guess yes on native Windows.
                 mingw* | windows*)  gl_cv_func_log2_ieee="guessing yes" ;;
                                     # If we don't know, obey --enable-cross-guesses.
                 *)                  gl_cv_func_log2_ieee="$gl_cross_guess_normal" ;;
               esac
              ])
            LIBS="$saved_LIBS"
          ])
        case "$gl_cv_func_log2_ieee" in
          *yes) ;;
          *) REPLACE_LOG2=1 ;;
        esac
      fi
    ])
  else
    HAVE_LOG2=0
    case "$gl_cv_onwards_func_log2" in
      future*) REPLACE_LOG2=1 ;;
    esac
  fi
  if test $HAVE_LOG2 = 0 || test $REPLACE_LOG2 = 1; then
    dnl Find libraries needed to link lib/log2.c.
    AC_REQUIRE([gl_FUNC_ISNAND])
    AC_REQUIRE([gl_FUNC_FREXP])
    AC_REQUIRE([gl_FUNC_LOG])
    LOG2_LIBM=
    dnl Append $ISNAND_LIBM to LOG2_LIBM, avoiding gratuitous duplicates.
    case " $LOG2_LIBM " in
      *" $ISNAND_LIBM "*) ;;
      *) LOG2_LIBM="$LOG2_LIBM $ISNAND_LIBM" ;;
    esac
    dnl Append $FREXP_LIBM to LOG2_LIBM, avoiding gratuitous duplicates.
    case " $LOG2_LIBM " in
      *" $FREXP_LIBM "*) ;;
      *) LOG2_LIBM="$LOG2_LIBM $FREXP_LIBM" ;;
    esac
    dnl Append $LOG_LIBM to LOG2_LIBM, avoiding gratuitous duplicates.
    case " $LOG2_LIBM " in
      *" $LOG_LIBM "*) ;;
      *) LOG2_LIBM="$LOG2_LIBM $LOG_LIBM" ;;
    esac
  fi
])

dnl Test whether log2() works.
dnl On Cygwin 1.7.9, log2(2^29) is not exactly 29.
AC_DEFUN([gl_FUNC_LOG2_WORKS],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether log2 works], [gl_cv_func_log2_works],
    [
      AC_RUN_IFELSE(
        [AC_LANG_SOURCE([[
#include <math.h>
#ifndef log2 /* for Cygwin 1.7.x */
extern
#ifdef __cplusplus
"C"
#endif
double log2 (double);
#endif
volatile double x;
volatile double y;
int main ()
{
  int result = 0;
  /* This test fails on Cygwin 1.7.9.  */
  x = 536870912.0;
  y = log2 (x);
  if (!(y == 29.0))
    result |= 1;
  return result;
}
]])],
        [gl_cv_func_log2_works=yes],
        [gl_cv_func_log2_works=no],
        [case "$host_os" in
           cygwin*)           gl_cv_func_log2_works="guessing no" ;;
                              # Guess yes on native Windows.
           mingw* | windows*) gl_cv_func_log2_works="guessing yes" ;;
           *)                 gl_cv_func_log2_works="guessing yes" ;;
         esac
        ])
    ])
])

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kc3-lang/gnulib/m4/log2.m4

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m4/log2.m4