1# expf.m4 serial 2
2dnl Copyright (C) 2011-2014 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_EXPF],
8[
9  AC_REQUIRE([gl_MATH_H_DEFAULTS])
10  AC_REQUIRE([gl_FUNC_EXP])
11
12  dnl Persuade glibc <math.h> to declare expf().
13  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14
15  dnl Test whether expf() exists. Assume that expf(), if it exists, is
16  dnl defined in the same library as exp().
17  save_LIBS="$LIBS"
18  LIBS="$LIBS $EXP_LIBM"
19  AC_CHECK_FUNCS([expf])
20  LIBS="$save_LIBS"
21  if test $ac_cv_func_expf = yes; then
22    EXPF_LIBM="$EXP_LIBM"
23  else
24    HAVE_EXPF=0
25    EXPF_LIBM="$EXP_LIBM"
26  fi
27  AC_SUBST([EXPF_LIBM])
28])
29