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# cbrtl.m4 serial 11
dnl Copyright (C) 2012-2023 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_CBRTL],
[
m4_divert_text([DEFAULTS], [gl_cbrtl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_CBRT])
dnl Persuade glibc <math.h> to declare cbrtl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether cbrtl() exists. Assume that cbrtl(), if it exists, is
dnl defined in the same library as cbrt().
save_LIBS="$LIBS"
LIBS="$LIBS $CBRT_LIBM"
AC_CHECK_FUNCS([cbrtl])
LIBS="$save_LIBS"
if test $ac_cv_func_cbrtl = yes; then
CBRTL_LIBM="$CBRT_LIBM"
dnl Also check whether it's declared.
dnl IRIX 6.5 has cbrtl() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECL([cbrtl], , [HAVE_DECL_CBRTL=0], [[#include <math.h>]])
save_LIBS="$LIBS"
LIBS="$LIBS $CBRTL_LIBM"
gl_FUNC_CBRTL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_cbrtl_works" in
*yes) ;;
*) REPLACE_CBRTL=1 ;;
esac
m4_ifdef([gl_FUNC_CBRTL_IEEE], [
if test $gl_cbrtl_required = ieee && test $REPLACE_CBRTL = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether cbrtl works according to ISO C 99 with IEC 60559],
[gl_cv_func_cbrtl_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $CBRTL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
]gl_LONG_DOUBLE_SIGNBIT_CODE[
static long double dummy (long double x) { return 0; }
int main (int argc, char *argv[])
{
extern
#ifdef __cplusplus
"C"
#endif
long double cbrtl (long double);
long double (* volatile my_cbrtl) (long double) = argc ? cbrtl : dummy;
long double f;
/* Test cbrtl(-0.0).
This test fails on IRIX 6.5. */
f = my_cbrtl (minus_zerol);
if (!(f == 0.0L) || (signbitl (minus_zerol) && !signbitl (f)))
return 1;
return 0;
}
]])],
[gl_cv_func_cbrtl_ieee=yes],
[gl_cv_func_cbrtl_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_cbrtl_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_cbrtl_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_cbrtl_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_cbrtl_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_cbrtl_ieee" in
*yes) ;;
*) REPLACE_CBRTL=1 ;;
esac
fi
])
else
HAVE_CBRTL=0
HAVE_DECL_CBRTL=0
fi
if test $HAVE_CBRTL = 0 || test $REPLACE_CBRTL = 1; then
dnl Find libraries needed to link lib/cbrtl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
CBRTL_LIBM="$CBRT_LIBM"
else
AC_REQUIRE([gl_FUNC_FREXPL])
AC_REQUIRE([gl_FUNC_LDEXPL])
CBRTL_LIBM=
dnl Append $FREXPL_LIBM to CBRTL_LIBM, avoiding gratuitous duplicates.
case " $CBRTL_LIBM " in
*" $FREXPL_LIBM "*) ;;
*) CBRTL_LIBM="$CBRTL_LIBM $FREXPL_LIBM" ;;
esac
dnl Append $LDEXPL_LIBM to CBRTL_LIBM, avoiding gratuitous duplicates.
case " $CBRTL_LIBM " in
*" $LDEXPL_LIBM "*) ;;
*) CBRTL_LIBM="$CBRTL_LIBM $LDEXPL_LIBM" ;;
esac
fi
fi
AC_SUBST([CBRTL_LIBM])
])
dnl Test whether cbrtl() works.
dnl On OpenBSD 5.1/SPARC, cbrtl(16.0L) is = 1.2599...
AC_DEFUN([gl_FUNC_CBRTL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether cbrtl works], [gl_cv_func_cbrtl_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
long double cbrtl (long double);
volatile long double x;
long double y;
int main ()
{
x = 16.0L;
y = cbrtl (x);
if (y < 2.0L)
return 1;
return 0;
}
]])],
[gl_cv_func_cbrtl_works=yes],
[gl_cv_func_cbrtl_works=no],
[case "$host_os" in
openbsd*) gl_cv_func_cbrtl_works="guessing no";;
# Guess yes on native Windows.
mingw*) gl_cv_func_cbrtl_works="guessing yes";;
*) gl_cv_func_cbrtl_works="guessing yes";;
esac
])
])
])
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