blob: b35f238dd65e06323f5f9aa205419fc6eadaa6b2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
# copysignl.m4 serial 3
dnl Copyright (C) 2011-2022 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_COPYSIGNL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
dnl Persuade glibc <math.h> to declare copysignl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Determine COPYSIGNL_LIBM.
gl_MATHFUNC([copysignl], [long double], [(long double, long double)])
if test $gl_cv_func_copysignl_no_libm = no \
&& test $gl_cv_func_copysignl_in_libm = no; then
HAVE_COPYSIGNL=0
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
AC_REQUIRE([gl_FUNC_COPYSIGN])
COPYSIGNL_LIBM="$COPYSIGN_LIBM"
else
COPYSIGNL_LIBM=
fi
fi
AC_SUBST([COPYSIGNL_LIBM])
])
|