Commit | Line | Data |
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8aeb5be9 | 1 | # readlink.m4 serial 11 |
ae0d7250 PE |
2 | dnl Copyright (C) 2003, 2007, 2009-2011 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_READLINK], | |
8 | [ | |
9 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
10 | AC_CHECK_FUNCS_ONCE([readlink]) | |
11 | if test $ac_cv_func_readlink = no; then | |
12 | HAVE_READLINK=0 | |
ae0d7250 PE |
13 | else |
14 | AC_CACHE_CHECK([whether readlink signature is correct], | |
15 | [gl_cv_decl_readlink_works], | |
16 | [AC_COMPILE_IFELSE( | |
17 | [AC_LANG_PROGRAM( | |
18 | [[#include <unistd.h> | |
19 | /* Cause compilation failure if original declaration has wrong type. */ | |
20 | ssize_t readlink (const char *, char *, size_t);]])], | |
21 | [gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])]) | |
22 | dnl Solaris 9 ignores trailing slash. | |
23 | dnl FreeBSD 7.2 dereferences only one level of links with trailing slash. | |
24 | AC_CACHE_CHECK([whether readlink handles trailing slash correctly], | |
25 | [gl_cv_func_readlink_works], | |
26 | [# We have readlink, so assume ln -s works. | |
27 | ln -s conftest.no-such conftest.link | |
28 | ln -s conftest.link conftest.lnk2 | |
29 | AC_RUN_IFELSE( | |
30 | [AC_LANG_PROGRAM( | |
31 | [[#include <unistd.h> | |
32 | ]], [[char buf[20]; | |
33 | return readlink ("conftest.lnk2/", buf, sizeof buf) != -1;]])], | |
34 | [gl_cv_func_readlink_works=yes], [gl_cv_func_readlink_works=no], | |
35 | [gl_cv_func_readlink_works="guessing no"]) | |
36 | rm -f conftest.link conftest.lnk2]) | |
37 | if test "$gl_cv_func_readlink_works" != yes; then | |
38 | AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink | |
39 | fails to recognize a trailing slash.]) | |
40 | REPLACE_READLINK=1 | |
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41 | elif test "$gl_cv_decl_readlink_works" != yes; then |
42 | REPLACE_READLINK=1 | |
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43 | fi |
44 | fi | |
45 | ]) | |
46 | ||
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47 | # Like gl_FUNC_READLINK, except prepare for separate compilation |
48 | # (no REPLACE_READLINK, no AC_LIBOBJ). | |
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49 | AC_DEFUN([gl_FUNC_READLINK_SEPARATE], |
50 | [ | |
51 | AC_CHECK_FUNCS_ONCE([readlink]) | |
52 | gl_PREREQ_READLINK | |
53 | ]) | |
54 | ||
55 | # Prerequisites of lib/readlink.c. | |
56 | AC_DEFUN([gl_PREREQ_READLINK], | |
57 | [ | |
58 | : | |
59 | ]) |