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# rintl.m4 serial 9
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_RINTL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
dnl Persuade glibc <math.h> to declare rintl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Determine RINTL_LIBM.
gl_MATHFUNC([rintl], [long double], [(long double)])
if test $gl_cv_func_rintl_no_libm = yes \
|| test $gl_cv_func_rintl_in_libm = yes; then
if test $REPLACE_RINTL = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether rintl works],
[gl_cv_func_rintl_works],
[
save_LIBS="$LIBS"
LIBS="$LIBS $RINTL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
#undef rintl
extern
#ifdef __cplusplus
"C"
#endif
long double rintl (long double);
static long double dummy (long double x) { return 0; }
int main (int argc, char *argv[])
{
long double (* volatile my_rintl) (long double) = argc ? rintl : dummy;
int result = 0;
/* This test fails on NetBSD 9.0. */
{
volatile long double x = -0.3L;
long double y = my_rintl (x);
if (!(y == 0.0L))
result |= 1;
}
return result;
}
]])],
[gl_cv_func_rintl_works=yes],
[gl_cv_func_rintl_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_rintl_works="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_rintl_works="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_rintl_works="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_rintl_works="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_rintl_works" in
*yes) ;;
*) REPLACE_RINTL=1 ;;
esac
fi
else
HAVE_RINTL=0
fi
if test $HAVE_RINTL = 0 || test $REPLACE_RINTL = 1; then
dnl Find libraries needed to link lib/rintl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
AC_REQUIRE([gl_FUNC_RINT])
RINTL_LIBM="$RINT_LIBM"
else
RINTL_LIBM=
fi
fi
AC_SUBST([RINTL_LIBM])
])
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