expm1.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/expm1.m4

# expm1.m4 serial 10
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_EXPM1],
[
  m4_divert_text([DEFAULTS], [gl_expm1_required=plain])
  AC_REQUIRE([gl_MATH_H_DEFAULTS])

  dnl Persuade glibc <math.h> to declare expm1().
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

  EXPM1_LIBM=
  AC_CACHE_CHECK([whether expm1() can be used without linking with libm],
    [gl_cv_func_expm1_no_libm],
    [
      AC_LINK_IFELSE(
        [AC_LANG_PROGRAM(
           [[#ifndef __NO_MATH_INLINES
             # define __NO_MATH_INLINES 1 /* for glibc */
             #endif
             #include <math.h>
             double (* volatile funcptr) (double) = expm1;
             double x;]],
           [[return funcptr (x) > 0.5
                    || expm1 (x) > 0.5;]])],
        [gl_cv_func_expm1_no_libm=yes],
        [gl_cv_func_expm1_no_libm=no])
    ])
  if test $gl_cv_func_expm1_no_libm = no; then
    AC_CACHE_CHECK([whether expm1() can be used with libm],
      [gl_cv_func_expm1_in_libm],
      [
        save_LIBS="$LIBS"
        LIBS="$LIBS -lm"
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#ifndef __NO_MATH_INLINES
               # define __NO_MATH_INLINES 1 /* for glibc */
               #endif
               #include <math.h>
               double (* volatile funcptr) (double) = expm1;
               double x;]],
             [[return funcptr (x) > 0.5
                      || expm1 (x) > 0.5;]])],
          [gl_cv_func_expm1_in_libm=yes],
          [gl_cv_func_expm1_in_libm=no])
        LIBS="$save_LIBS"
      ])
    if test $gl_cv_func_expm1_in_libm = yes; then
      EXPM1_LIBM=-lm
    fi
  fi
  if test $gl_cv_func_expm1_no_libm = yes \
     || test $gl_cv_func_expm1_in_libm = yes; then
    :
    m4_ifdef([gl_FUNC_EXPM1_IEEE], [
      if test $gl_expm1_required = ieee && test $REPLACE_EXPM1 = 0; then
        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
        AC_CACHE_CHECK([whether expm1 works according to ISO C 99 with IEC 60559],
          [gl_cv_func_expm1_ieee],
          [
            save_LIBS="$LIBS"
            LIBS="$LIBS $EXPM1_LIBM"
            AC_RUN_IFELSE(
              [AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_DOUBLE_MINUS_ZERO_CODE[
]gl_DOUBLE_SIGNBIT_CODE[
static double dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
  double (* volatile my_expm1) (double) = argc ? expm1 : dummy;
  double y = my_expm1 (minus_zerod);
  if (!(y == 0.0) || (signbitd (minus_zerod) && !signbitd (y)))
    return 1;
  return 0;
}
              ]])],
              [gl_cv_func_expm1_ieee=yes],
              [gl_cv_func_expm1_ieee=no],
              [case "$host_os" in
                                     # Guess yes on glibc systems.
                 *-gnu* | gnu*)      gl_cv_func_expm1_ieee="guessing yes" ;;
                                     # Guess yes on musl systems.
                 *-musl* | midipix*) gl_cv_func_expm1_ieee="guessing yes" ;;
                                     # Guess yes on native Windows.
                 mingw*)             gl_cv_func_expm1_ieee="guessing yes" ;;
                                     # If we don't know, obey --enable-cross-guesses.
                 *)                  gl_cv_func_expm1_ieee="$gl_cross_guess_normal" ;;
               esac
              ])
            LIBS="$save_LIBS"
          ])
        case "$gl_cv_func_expm1_ieee" in
          *yes) ;;
          *) REPLACE_EXPM1=1 ;;
        esac
      fi
    ])
  else
    HAVE_EXPM1=0
  fi
  if test $HAVE_EXPM1 = 0 || test $REPLACE_EXPM1 = 1; then
    dnl Find libraries needed to link lib/expm1.c.
    AC_REQUIRE([gl_FUNC_ISNAND])
    AC_REQUIRE([gl_FUNC_EXP])
    AC_REQUIRE([gl_FUNC_ROUND])
    AC_REQUIRE([gl_FUNC_LDEXP])
    EXPM1_LIBM=
    dnl Append $ISNAND_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates.
    case " $EXPM1_LIBM " in
      *" $ISNAND_LIBM "*) ;;
      *) EXPM1_LIBM="$EXPM1_LIBM $ISNAND_LIBM" ;;
    esac
    dnl Append $EXP_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates.
    case " $EXPM1_LIBM " in
      *" $EXP_LIBM "*) ;;
      *) EXPM1_LIBM="$EXPM1_LIBM $EXP_LIBM" ;;
    esac
    dnl Append $ROUND_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates.
    case " $EXPM1_LIBM " in
      *" $ROUND_LIBM "*) ;;
      *) EXPM1_LIBM="$EXPM1_LIBM $ROUND_LIBM" ;;
    esac
    dnl Append $LDEXP_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates.
    case " $EXPM1_LIBM " in
      *" $LDEXP_LIBM "*) ;;
      *) EXPM1_LIBM="$EXPM1_LIBM $LDEXP_LIBM" ;;
    esac
  fi
  AC_SUBST([EXPM1_LIBM])
])

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kc3-lang/gnulib/m4/expm1.m4

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m4/expm1.m4