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# copysignf.m4 serial 4
dnl Copyright (C) 2011-2021 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_COPYSIGNF],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
dnl Persuade glibc <math.h> to declare copysignf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Determine COPYSIGNF_LIBM.
gl_MATHFUNC([copysignf], [float], [(float, float)],
[extern
#ifdef __cplusplus
"C"
#endif
float copysignf (float, float);
])
if test $gl_cv_func_copysignf_no_libm = yes \
|| test $gl_cv_func_copysignf_in_libm = yes; then
HAVE_COPYSIGNF=1
dnl Also check whether it's declared.
dnl IRIX 6.5 has copysignf() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECL([copysignf], , [HAVE_DECL_COPYSIGNF=0], [[#include <math.h>]])
else
HAVE_COPYSIGNF=0
HAVE_DECL_COPYSIGNF=0
dnl On HP-UX 11.31/ia64, cc has a built-in for copysignf that redirects
dnl to the symbol '_copysignf', defined in libm, not libc.
case "$host_os" in
hpux*) COPYSIGNF_LIBM='-lm' ;;
*) COPYSIGNF_LIBM= ;;
esac
fi
AC_SUBST([COPYSIGNF_LIBM])
])
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