2 dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_LOGF],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 AC_REQUIRE([gl_FUNC_LOG])
12 dnl Persuade glibc <math.h> to declare logf().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 dnl Test whether logf() exists. Assume that logf(), if it exists, is
16 dnl defined in the same library as log().
18 LIBS="$LIBS $LOG_LIBM"
19 AC_CHECK_FUNCS([logf])
21 if test $ac_cv_func_logf = yes; then