1 # c-strtod.m4 serial 11
3 # Copyright (C) 2004-2006, 2009-2010 Free Software Foundation, Inc.
4 # This file is free software; the Free Software Foundation
5 # gives unlimited permission to copy and/or distribute it,
6 # with or without modifications, as long as this notice is preserved.
8 # Written by Paul Eggert.
10 AC_DEFUN([gl_C99_STRTOLD],
11 [
12 AC_CACHE_CHECK([whether strtold conforms to C99],
13 [gl_cv_func_c99_strtold],
14 [AC_LINK_IFELSE(
15 [AC_LANG_PROGRAM(
16 [[/* On HP-UX before 11.23, strtold returns a struct instead of
17 long double. Reject implementations like that, by requiring
18 compatibility with the C99 prototype. */
19 #include <stdlib.h>
20 static long double (*p) (char const *, char **) = strtold;
21 static long double
22 test (char const *nptr, char **endptr)
23 {
24 long double r;
25 r = strtold (nptr, endptr);
26 return r;
27 }]],
28 [[return test ("1.0", NULL) != 1 || p ("1.0", NULL) != 1;]])],
29 [gl_cv_func_c99_strtold=yes],
30 [gl_cv_func_c99_strtold=no])])
31 if test $gl_cv_func_c99_strtold = yes; then
32 AC_DEFINE([HAVE_C99_STRTOLD], [1], [Define to 1 if strtold conforms to C99.])
33 fi
34 ])
36 AC_DEFUN([gl_C_STRTOD],
37 [
38 AC_LIBOBJ([c-strtod])
40 dnl Prerequisites of lib/c-strtod.c.
41 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
43 AC_REQUIRE([AC_C_INLINE])
44 :
45 ])
47 AC_DEFUN([gl_C_STRTOLD],
48 [
49 AC_LIBOBJ([c-strtold])
51 dnl Prerequisites of lib/c-strtold.c.
52 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
53 AC_REQUIRE([gl_C99_STRTOLD])
55 AC_REQUIRE([AC_C_INLINE])
56 :
57 ])