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-rw-r--r--m4/c-strtod.m455
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1# c-strtod.m4 serial 6
2
3# Copyright (C) 2004, 2005 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.
7
8# Written by Paul Eggert.
9
10AC_DEFUN([gl_C99_STRTOLD],
11[
12 AC_CACHE_CHECK([whether strtold conforms to C99],
13 [gl_cv_func_c99_strtold],
14 [AC_COMPILE_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])
35
36AC_DEFUN([gl_C_STRTOD],
37[
38 AC_LIBSOURCES([c-strtod.c, c-strtod.h])
39 AC_LIBOBJ([c-strtod])
40
41 dnl Prerequisites of lib/c-strtod.c.
42 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
43 :
44])
45
46AC_DEFUN([gl_C_STRTOLD],
47[
48 AC_LIBSOURCES([c-strtold.c, c-strtod.h])
49 AC_LIBOBJ([c-strtold])
50
51 dnl Prerequisites of lib/c-strtold.c.
52 AC_REQUIRE([gl_C_STRTOD])
53 AC_REQUIRE([gl_C99_STRTOLD])
54 :
55])