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ae0d7250 PE |
1 | # serial 21 |
2 | ||
3 | # Copyright (C) 1997-2001, 2003-2011 Free Software Foundation, Inc. | |
4 | # | |
5 | # This file is free software; the Free Software Foundation | |
6 | # gives unlimited permission to copy and/or distribute it, | |
7 | # with or without modifications, as long as this notice is preserved. | |
8 | ||
9 | dnl From Jim Meyering. | |
10 | ||
11 | AC_DEFUN([gl_FUNC_LSTAT], | |
12 | [ | |
13 | AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS]) | |
14 | dnl If lstat does not exist, the replacement <sys/stat.h> does | |
15 | dnl "#define lstat stat", and lstat.c is a no-op. | |
16 | AC_CHECK_FUNCS_ONCE([lstat]) | |
17 | if test $ac_cv_func_lstat = yes; then | |
18 | AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK]) | |
19 | if test $ac_cv_func_lstat_dereferences_slashed_symlink = no; then | |
20 | dnl Note: AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK does AC_LIBOBJ([lstat]). | |
21 | REPLACE_LSTAT=1 | |
22 | fi | |
23 | # Prerequisites of lib/lstat.c. | |
24 | AC_REQUIRE([AC_C_INLINE]) | |
25 | else | |
26 | HAVE_LSTAT=0 | |
27 | fi | |
28 | ]) | |
29 | ||
30 | # Redefine AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, because it is no longer | |
31 | # maintained in Autoconf. | |
32 | AC_DEFUN([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK], | |
33 | [ | |
34 | AC_CACHE_CHECK([whether lstat correctly handles trailing slash], | |
35 | [ac_cv_func_lstat_dereferences_slashed_symlink], | |
36 | [rm -f conftest.sym conftest.file | |
37 | echo >conftest.file | |
38 | if test "$as_ln_s" = "ln -s" && ln -s conftest.file conftest.sym; then | |
39 | AC_RUN_IFELSE( | |
40 | [AC_LANG_PROGRAM( | |
41 | [AC_INCLUDES_DEFAULT], | |
42 | [[struct stat sbuf; | |
43 | /* Linux will dereference the symlink and fail, as required by | |
44 | POSIX. That is better in the sense that it means we will not | |
45 | have to compile and use the lstat wrapper. */ | |
46 | return lstat ("conftest.sym/", &sbuf) == 0; | |
47 | ]])], | |
48 | [ac_cv_func_lstat_dereferences_slashed_symlink=yes], | |
49 | [ac_cv_func_lstat_dereferences_slashed_symlink=no], | |
50 | [# When cross-compiling, be pessimistic so we will end up using the | |
51 | # replacement version of lstat that checks for trailing slashes and | |
52 | # calls lstat a second time when necessary. | |
53 | ac_cv_func_lstat_dereferences_slashed_symlink=no | |
54 | ]) | |
55 | else | |
56 | # If the 'ln -s' command failed, then we probably don't even | |
57 | # have an lstat function. | |
58 | ac_cv_func_lstat_dereferences_slashed_symlink=no | |
59 | fi | |
60 | rm -f conftest.sym conftest.file | |
61 | ]) | |
62 | test $ac_cv_func_lstat_dereferences_slashed_symlink = yes && | |
63 | AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1], | |
64 | [Define to 1 if `lstat' dereferences a symlink specified | |
65 | with a trailing slash.]) | |
66 | if test "x$ac_cv_func_lstat_dereferences_slashed_symlink" = xno; then | |
67 | AC_LIBOBJ([lstat]) | |
68 | fi | |
69 | ]) |