log2f.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.

Download

m4/log2f.m4

# log2f.m4 serial 13
dnl Copyright (C) 2010-2023 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_LOG2F],
[
  m4_divert_text([DEFAULTS], [gl_log2f_required=plain])
  AC_REQUIRE([gl_MATH_H_DEFAULTS])
  AC_REQUIRE([gl_FUNC_LOG2])

  dnl Persuade glibc <math.h> to declare log2f().
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

  dnl Determine LOG2F_LIBM.
  gl_COMMON_DOUBLE_MATHFUNC([log2f])

  dnl Test whether log2f() exists.
  save_LIBS="$LIBS"
  LIBS="$LIBS $LOG2F_LIBM"
  gl_CHECK_FUNCS_ANDROID([log2f], [[#include <math.h>]])
  LIBS="$save_LIBS"
  if test $ac_cv_func_log2f = yes; then
    HAVE_LOG2F=1
    dnl Also check whether it's declared.
    dnl IRIX 6.5 has log2f() in libm but doesn't declare it in <math.h>.
    AC_CHECK_DECL([log2f], , [HAVE_DECL_LOG2F=0], [[#include <math.h>]])

    save_LIBS="$LIBS"
    LIBS="$LIBS $LOG2F_LIBM"
    gl_FUNC_LOG2F_WORKS
    LIBS="$save_LIBS"
    case "$gl_cv_func_log2f_works" in
      *yes) ;;
      *) REPLACE_LOG2F=1 ;;
    esac

    m4_ifdef([gl_FUNC_LOG2F_IEEE], [
      if test $gl_log2f_required = ieee && test $REPLACE_LOG2F = 0; then
        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
        AC_CACHE_CHECK([whether log2f works according to ISO C 99 with IEC 60559],
          [gl_cv_func_log2f_ieee],
          [
            save_LIBS="$LIBS"
            LIBS="$LIBS $LOG2F_LIBM"
            AC_RUN_IFELSE(
              [AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
#ifndef log2f /* for Cygwin 1.7.x */
extern
#ifdef __cplusplus
"C"
#endif
float log2f (float);
#endif
/* Compare two numbers with ==.
   This is a separate function because IRIX 6.5 "cc -O" miscompiles an
   'x == x' test.  */
static int
numeric_equal (float x, float y)
{
  return x == y;
}
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
  float (* volatile my_log2f) (float) = argc ? log2f : dummy;
  /* Test log2f(negative).
     This test fails on NetBSD 5.1 and Solaris 10/x86_64.  */
  float y = my_log2f (-1.0f);
  if (numeric_equal (y, y))
    return 1;
  return 0;
}
              ]])],
              [gl_cv_func_log2f_ieee=yes],
              [gl_cv_func_log2f_ieee=no],
              [case "$host_os" in
                                     # Guess yes on glibc systems.
                 *-gnu* | gnu*)      gl_cv_func_log2f_ieee="guessing yes" ;;
                                     # Guess yes on musl systems.
                 *-musl* | midipix*) gl_cv_func_log2f_ieee="guessing yes" ;;
                                     # Guess yes on native Windows.
                 mingw*)             gl_cv_func_log2f_ieee="guessing yes" ;;
                                     # If we don't know, obey --enable-cross-guesses.
                 *)                  gl_cv_func_log2f_ieee="$gl_cross_guess_normal" ;;
               esac
              ])
            LIBS="$save_LIBS"
          ])
        case "$gl_cv_func_log2f_ieee" in
          *yes) ;;
          *) REPLACE_LOG2F=1 ;;
        esac
      fi
    ])
  else
    HAVE_LOG2F=0
    HAVE_DECL_LOG2F=0
    case "$gl_cv_onwards_func_log2f" in
      future*) REPLACE_LOG2F=1 ;;
    esac
  fi
  if test $HAVE_LOG2F = 0 || test $REPLACE_LOG2F = 1; then
    dnl Find libraries needed to link lib/log2f.c.
    if test $ac_cv_func_log2 = yes; then
      AC_DEFINE([HAVE_LOG2], [1],
        [Define to 1 if the log2() function is available in libc or libm.])
      LOG2F_LIBM="$LOG2_LIBM"
    else
      AC_REQUIRE([gl_FUNC_ISNANF])
      AC_REQUIRE([gl_FUNC_FREXPF])
      AC_REQUIRE([gl_FUNC_LOGF])
      LOG2F_LIBM=
      dnl Append $ISNANF_LIBM to LOG2F_LIBM, avoiding gratuitous duplicates.
      case " $LOG2F_LIBM " in
        *" $ISNANF_LIBM "*) ;;
        *) LOG2F_LIBM="$LOG2F_LIBM $ISNANF_LIBM" ;;
      esac
      dnl Append $FREXPF_LIBM to LOG2F_LIBM, avoiding gratuitous duplicates.
      case " $LOG2F_LIBM " in
        *" $FREXPF_LIBM "*) ;;
        *) LOG2F_LIBM="$LOG2F_LIBM $FREXPF_LIBM" ;;
      esac
      dnl Append $LOGF_LIBM to LOG2F_LIBM, avoiding gratuitous duplicates.
      case " $LOG2F_LIBM " in
        *" $LOGF_LIBM "*) ;;
        *) LOG2F_LIBM="$LOG2F_LIBM $LOGF_LIBM" ;;
      esac
    fi
  fi
])

dnl Test whether log2() works.
dnl On OSF/1 5.1, log2f(-0.0f) is NaN.
dnl On Cygwin 1.7.9, log2f(2^13) is not exactly 13.
AC_DEFUN([gl_FUNC_LOG2F_WORKS],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether log2f works], [gl_cv_func_log2f_works],
    [
      AC_RUN_IFELSE(
        [AC_LANG_SOURCE([[
#include <math.h>
#ifndef log2f /* for Cygwin 1.7.x */
extern
#ifdef __cplusplus
"C"
#endif
float log2f (float);
#endif
volatile float x;
volatile float y;
int main ()
{
  int result = 0;
  /* This test fails on OSF/1 5.1.  */
  x = -0.0f;
  y = log2f (x);
  if (!(y + y == y))
    result |= 1;
  /* This test fails on Cygwin 1.7.9.  */
  x = 8192.0f;
  y = log2f (x);
  if (!(y == 13.0f))
    result |= 2;
  return result;
}
]])],
        [gl_cv_func_log2f_works=yes],
        [gl_cv_func_log2f_works=no],
        [case "$host_os" in
           cygwin* | osf*) gl_cv_func_log2f_works="guessing no" ;;
                           # Guess yes on native Windows.
           mingw*)         gl_cv_func_log2f_works="guessing yes" ;;
           *)              gl_cv_func_log2f_works="guessing yes" ;;
         esac
        ])
    ])
])

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m4/log2f.m4