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# exp2f.m4 serial 1
dnl Copyright (C) 2011-2018 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_EXP2F],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_EXP2])
dnl Persuade glibc <math.h> to declare exp2f().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether exp2f() exists. Assume that exp2f(), if it exists, is
dnl defined in the same library as exp2().
save_LIBS="$LIBS"
LIBS="$LIBS $EXP2_LIBM"
AC_CHECK_FUNCS([exp2f])
LIBS="$save_LIBS"
if test $ac_cv_func_exp2f = yes; then
HAVE_EXP2F=1
EXP2F_LIBM="$EXP2_LIBM"
dnl Also check whether it's declared.
dnl IRIX 6.5 has exp2f() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECL([exp2f], , [HAVE_DECL_EXP2F=0], [[#include <math.h>]])
else
HAVE_EXP2F=0
HAVE_DECL_EXP2F=0
dnl Find libraries needed to link lib/exp2f.c.
EXP2F_LIBM="$EXP2_LIBM"
fi
AC_SUBST([EXP2F_LIBM])
])
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