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# remainderl.m4 serial 9
dnl Copyright (C) 2012-2018 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_REMAINDERL],
[
m4_divert_text([DEFAULTS], [gl_remainderl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_REMAINDER])
dnl Persuade glibc <math.h> to declare remainderl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether remainderl() exists. Assume that remainderl(), if it exists, is
dnl defined in the same library as remainder().
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDER_LIBM"
AC_CACHE_CHECK([for remainderl],
[gl_cv_func_remainderl],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
long double remainderl (long double, long double);
long double (*funcptr) (long double, long double) = remainderl;
long double x;
long double y;]],
[[return funcptr (x, y) > 1
|| remainderl (x, y) > 1;]])],
[gl_cv_func_remainderl=yes],
[gl_cv_func_remainderl=no])
])
LIBS="$save_LIBS"
if test $gl_cv_func_remainderl = yes; then
HAVE_REMAINDERL=1
REMAINDERL_LIBM="$REMAINDER_LIBM"
dnl Also check whether it's declared.
dnl IRIX 6.5 has remainderl() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECLS([remainderl], , [HAVE_DECL_REMAINDERL=0], [[#include <math.h>]])
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDERL_LIBM"
gl_FUNC_REMAINDERL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_remainderl_works" in
*yes) ;;
*) REPLACE_REMAINDERL=1 ;;
esac
m4_ifdef([gl_FUNC_REMAINDERL_IEEE], [
if test $gl_remainderl_required = ieee && test $REPLACE_REMAINDERL = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainderl works according to ISO C 99 with IEC 60559],
[gl_cv_func_remainderl_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDERL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
long double remainderl (long double, long double);
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (long double x, long double y)
{
return x == y;
}
static long double dummy (long double x, long double y) { return 0; }
int main (int argc, char *argv[])
{
long double (*my_remainderl) (long double, long double) = argc ? remainderl : dummy;
long double f;
/* Test remainderl(...,0.0L).
This test fails on OSF/1 5.1. */
f = my_remainderl (2.0L, 0.0L);
if (numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_remainderl_ieee=yes],
[gl_cv_func_remainderl_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_remainderl_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_remainderl_ieee="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_remainderl_ieee="guessing no" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_remainderl_ieee" in
*yes) ;;
*) REPLACE_REMAINDERL=1 ;;
esac
fi
])
else
HAVE_REMAINDERL=0
HAVE_DECL_REMAINDERL=0
fi
if test $HAVE_REMAINDERL = 0 || test $REPLACE_REMAINDERL = 1; then
dnl Find libraries needed to link lib/remainderl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
REMAINDERL_LIBM="$REMAINDER_LIBM"
else
AC_REQUIRE([gl_FUNC_FABSL])
AC_REQUIRE([gl_FUNC_FMODL])
AC_REQUIRE([gl_FUNC_ISNANL])
REMAINDERL_LIBM=
dnl Append $FABSL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERL_LIBM " in
*" $FABSL_LIBM "*) ;;
*) REMAINDERL_LIBM="$REMAINDERL_LIBM $FABSL_LIBM" ;;
esac
dnl Append $FMODL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERL_LIBM " in
*" $FMODL_LIBM "*) ;;
*) REMAINDERL_LIBM="$REMAINDERL_LIBM $FMODL_LIBM" ;;
esac
dnl Append $ISNANL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERL_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) REMAINDERL_LIBM="$REMAINDERL_LIBM $ISNANL_LIBM" ;;
esac
fi
fi
AC_SUBST([REMAINDERL_LIBM])
])
dnl Test whether remainderl() works.
dnl It produces completely wrong values on OpenBSD 5.1/SPARC.
AC_DEFUN([gl_FUNC_REMAINDERL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainderl works], [gl_cv_func_remainderl_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
long double remainderl (long double, long double);
volatile long double x;
volatile long double y;
long double z;
int main ()
{
/* This test fails on OpenBSD 5.1/SPARC. */
x = 9.245907126L;
y = 3.141592654L;
z = remainderl (x, y);
if (z >= 0.0L)
return 1;
return 0;
}
]])],
[gl_cv_func_remainderl_works=yes],
[gl_cv_func_remainderl_works=no],
[case "$host_os" in
openbsd*) gl_cv_func_remainderl_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_remainderl_works="guessing yes" ;;
*) gl_cv_func_remainderl_works="guessing yes" ;;
esac
])
])
])
|
