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# expm1f.m4 serial 5
dnl Copyright (C) 2011-2023 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_EXPM1F],
[
m4_divert_text([DEFAULTS], [gl_expm1f_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_EXPM1])
dnl Persuade glibc <math.h> to declare expm1f().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether expm1f() exists. Assume that expm1f(), if it exists, is
dnl defined in the same library as expm1().
save_LIBS="$LIBS"
LIBS="$LIBS $EXPM1_LIBM"
AC_CHECK_FUNCS([expm1f])
LIBS="$save_LIBS"
if test $ac_cv_func_expm1f = yes; then
EXPM1F_LIBM="$EXPM1_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $EXPM1F_LIBM"
gl_FUNC_EXPM1F_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_expm1f_works" in
*yes) ;;
*) REPLACE_EXPM1F=1 ;;
esac
m4_ifdef([gl_FUNC_EXPM1F_IEEE], [
if test $gl_expm1f_required = ieee && test $REPLACE_EXPM1F = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether expm1f works according to ISO C 99 with IEC 60559],
[gl_cv_func_expm1f_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $EXPM1F_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_FLOAT_MINUS_ZERO_CODE[
]gl_FLOAT_SIGNBIT_CODE[
#ifndef expm1f
extern
#ifdef __cplusplus
"C"
#endif
float expm1f (float);
#endif
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (float x, float y)
{
return x == y;
}
static float dummy (float x) { return 0; }
int main (int argc, char *argv[])
{
float (* volatile my_expm1f) (float) = argc ? expm1f : dummy;
/* Test expm1f(-0.0f).
This test fails on AIX 7.2. */
float y = my_expm1f (minus_zerof);
if (signbitf (minus_zerof) && !signbitf (y))
return 1;
return 0;
}
]])],
[gl_cv_func_expm1f_ieee=yes],
[gl_cv_func_expm1f_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_expm1f_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_expm1f_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_expm1f_ieee="guessing yes" ;;
# Guess no on AIX.
aix*) gl_cv_func_expm1f_ieee="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_expm1f_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_expm1f_ieee" in
*yes) ;;
*) REPLACE_EXPM1F=1 ;;
esac
fi
])
else
HAVE_EXPM1F=0
fi
if test $HAVE_EXPM1F = 0 || test $REPLACE_EXPM1F = 1; then
dnl Find libraries needed to link lib/expm1f.c.
EXPM1F_LIBM="$EXPM1_LIBM"
fi
AC_SUBST([EXPM1F_LIBM])
])
dnl Test whether expm1f() works.
dnl On IRIX 6.5, for arguments <= -17.32868, it returns -5.6295e14.
AC_DEFUN([gl_FUNC_EXPM1F_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether expm1f works], [gl_cv_func_expm1f_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
volatile float x;
float y;
int main ()
{
x = -100.0f;
y = expm1f (x);
if (y < -1.0f)
return 1;
return 0;
}
]])],
[gl_cv_func_expm1f_works=yes],
[gl_cv_func_expm1f_works=no],
[case "$host_os" in
irix*) gl_cv_func_expm1f_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_expm1f_works="guessing yes" ;;
*) gl_cv_func_expm1f_works="guessing yes" ;;
esac
])
])
])
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