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8424cc97 SM |
1 | # strchrnul.m4 serial 9 |
2 | dnl Copyright (C) 2003, 2007, 2009-2015 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. | |
6 | ||
7 | AC_DEFUN([gl_FUNC_STRCHRNUL], | |
8 | [ | |
9 | dnl Persuade glibc <string.h> to declare strchrnul(). | |
10 | AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) | |
11 | ||
12 | AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) | |
13 | AC_CHECK_FUNCS([strchrnul]) | |
14 | if test $ac_cv_func_strchrnul = no; then | |
15 | HAVE_STRCHRNUL=0 | |
16 | else | |
17 | AC_CACHE_CHECK([whether strchrnul works], | |
18 | [gl_cv_func_strchrnul_works], | |
19 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ | |
20 | #include <string.h> /* for strchrnul */ | |
21 | ]], [[const char *buf = "a"; | |
22 | return strchrnul (buf, 'b') != buf + 1; | |
23 | ]])], | |
24 | [gl_cv_func_strchrnul_works=yes], | |
25 | [gl_cv_func_strchrnul_works=no], | |
26 | [dnl Cygwin 1.7.9 introduced strchrnul, but it was broken until 1.7.10 | |
27 | AC_EGREP_CPP([Lucky user], | |
28 | [ | |
29 | #if defined __CYGWIN__ | |
30 | #include <cygwin/version.h> | |
31 | #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 9) | |
32 | Lucky user | |
33 | #endif | |
34 | #else | |
35 | Lucky user | |
36 | #endif | |
37 | ], | |
38 | [gl_cv_func_strchrnul_works="guessing yes"], | |
39 | [gl_cv_func_strchrnul_works="guessing no"]) | |
40 | ]) | |
41 | ]) | |
42 | case "$gl_cv_func_strchrnul_works" in | |
43 | *yes) ;; | |
44 | *) REPLACE_STRCHRNUL=1 ;; | |
45 | esac | |
46 | fi | |
47 | ]) | |
48 | ||
49 | # Prerequisites of lib/strchrnul.c. | |
50 | AC_DEFUN([gl_PREREQ_STRCHRNUL], [:]) |