1 # floorf.m4 serial 6
2 dnl Copyright (C) 2007, 2009-2010 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_FLOORF],
8 [
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 dnl Persuade glibc <math.h> to declare floorf().
11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
12 dnl Test whether floorf() is declared.
13 AC_CHECK_DECLS([floorf], , , [#include <math.h>])
14 if test "$ac_cv_have_decl_floorf" = yes; then
15 dnl Test whether floorf() can be used without libm.
16 gl_FUNC_FLOORF_LIBS
17 if test "$FLOORF_LIBM" = "?"; then
18 dnl Sun C 5.0 on Solaris declares floorf() and has it in the system-wide
19 dnl libm.so, but not in the libm.so that the compiler uses.
20 REPLACE_FLOORF=1
21 fi
22 else
23 HAVE_DECL_FLOORF=0
24 fi
25 if test $HAVE_DECL_FLOORF = 0 || test $REPLACE_FLOORF = 1; then
26 AC_LIBOBJ([floorf])
27 FLOORF_LIBM=
28 fi
29 AC_SUBST([FLOORF_LIBM])
30 ])
32 # Determines the libraries needed to get the floorf() function.
33 # Sets FLOORF_LIBM.
34 AC_DEFUN([gl_FUNC_FLOORF_LIBS],
35 [
36 gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [
37 gl_cv_func_floorf_libm=?
38 AC_TRY_LINK([
39 #ifndef __NO_MATH_INLINES
40 # define __NO_MATH_INLINES 1 /* for glibc */
41 #endif
42 #include <math.h>
43 float x;],
44 [x = floorf(x);],
45 [gl_cv_func_floorf_libm=])
46 if test "$gl_cv_func_floorf_libm" = "?"; then
47 save_LIBS="$LIBS"
48 LIBS="$LIBS -lm"
49 AC_TRY_LINK([
50 #ifndef __NO_MATH_INLINES
51 # define __NO_MATH_INLINES 1 /* for glibc */
52 #endif
53 #include <math.h>
54 float x;],
55 [x = floorf(x);],
56 [gl_cv_func_floorf_libm="-lm"])
57 LIBS="$save_LIBS"
58 fi
59 ])
60 FLOORF_LIBM="$gl_cv_func_floorf_libm"
61 ])