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# expf.m4 serial 3
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_EXPF],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_EXP])
dnl Persuade glibc <math.h> to declare expf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether expf() exists. Assume that expf(), if it exists, is
dnl defined in the same library as exp().
save_LIBS="$LIBS"
LIBS="$LIBS $EXP_LIBM"
AC_CHECK_FUNCS([expf])
LIBS="$save_LIBS"
if test $ac_cv_func_expf = yes; then
EXPF_LIBM="$EXP_LIBM"
else
HAVE_EXPF=0
dnl If the function is declared but does not appear to exist, it may be
dnl defined as an inline function. In order to avoid a conflict, we have
dnl to define rpl_expf, not expf.
AC_CHECK_DECLS([expf], [REPLACE_EXPF=1], , [[#include <math.h>]])
EXPF_LIBM="$EXP_LIBM"
fi
AC_SUBST([EXPF_LIBM])
])
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