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# 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])
])
|
