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5e8754f9 | 1 | # serial 27 |
f45c62c4 | 2 | |
5e8754f9 | 3 | # Copyright (C) 1997-2001, 2003-2016 Free Software Foundation, Inc. |
f45c62c4 YQ |
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 $ac_cv_func_lstat = yes; then | |
18 | AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK]) | |
5e8754f9 SDJ |
19 | case "$gl_cv_func_lstat_dereferences_slashed_symlink" in |
20 | *no) | |
f45c62c4 YQ |
21 | REPLACE_LSTAT=1 |
22 | ;; | |
23 | esac | |
24 | else | |
25 | HAVE_LSTAT=0 | |
26 | fi | |
27 | ]) | |
28 | ||
29 | # Prerequisites of lib/lstat.c. | |
30 | AC_DEFUN([gl_PREREQ_LSTAT], [:]) | |
31 | ||
32 | AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK], | |
33 | [ | |
34 | dnl We don't use AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK any more, because it | |
35 | dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ. | |
36 | AC_CACHE_CHECK([whether lstat correctly handles trailing slash], | |
37 | [gl_cv_func_lstat_dereferences_slashed_symlink], | |
38 | [rm -f conftest.sym conftest.file | |
39 | echo >conftest.file | |
4a626d0a PA |
40 | AC_RUN_IFELSE( |
41 | [AC_LANG_PROGRAM( | |
42 | [AC_INCLUDES_DEFAULT], | |
43 | [[struct stat sbuf; | |
44 | if (symlink ("conftest.file", "conftest.sym") != 0) | |
45 | return 1; | |
46 | /* Linux will dereference the symlink and fail, as required by | |
47 | POSIX. That is better in the sense that it means we will not | |
48 | have to compile and use the lstat wrapper. */ | |
49 | return lstat ("conftest.sym/", &sbuf) == 0; | |
50 | ]])], | |
51 | [gl_cv_func_lstat_dereferences_slashed_symlink=yes], | |
52 | [gl_cv_func_lstat_dereferences_slashed_symlink=no], | |
53 | [case "$host_os" in | |
5e8754f9 | 54 | *-gnu*) |
4a626d0a PA |
55 | # Guess yes on glibc systems. |
56 | gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; | |
57 | *) | |
58 | # If we don't know, assume the worst. | |
59 | gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;; | |
60 | esac | |
61 | ]) | |
f45c62c4 YQ |
62 | rm -f conftest.sym conftest.file |
63 | ]) | |
64 | case "$gl_cv_func_lstat_dereferences_slashed_symlink" in | |
65 | *yes) | |
66 | AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1], | |
67 | [Define to 1 if 'lstat' dereferences a symlink specified | |
68 | with a trailing slash.]) | |
69 | ;; | |
70 | esac | |
71 | ]) |