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c0c3707f | 1 | # serial 33 |
f45c62c4 | 2 | |
9c9d63b1 | 3 | # Copyright (C) 1997-2001, 2003-2021 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 | [ | |
c0c3707f | 13 | AC_REQUIRE([AC_CANONICAL_HOST]) |
f45c62c4 YQ |
14 | AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS]) |
15 | dnl If lstat does not exist, the replacement <sys/stat.h> does | |
16 | dnl "#define lstat stat", and lstat.c is a no-op. | |
17 | AC_CHECK_FUNCS_ONCE([lstat]) | |
18 | if test $ac_cv_func_lstat = yes; then | |
19 | AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK]) | |
c0c3707f CB |
20 | case $host_os,$gl_cv_func_lstat_dereferences_slashed_symlink in |
21 | solaris* | *no) | |
f45c62c4 YQ |
22 | REPLACE_LSTAT=1 |
23 | ;; | |
24 | esac | |
25 | else | |
26 | HAVE_LSTAT=0 | |
27 | fi | |
28 | ]) | |
29 | ||
30 | # Prerequisites of lib/lstat.c. | |
31 | AC_DEFUN([gl_PREREQ_LSTAT], [:]) | |
32 | ||
33 | AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK], | |
34 | [ | |
35 | dnl We don't use AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK any more, because it | |
36 | dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ. | |
c0c3707f | 37 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
f45c62c4 YQ |
38 | AC_CACHE_CHECK([whether lstat correctly handles trailing slash], |
39 | [gl_cv_func_lstat_dereferences_slashed_symlink], | |
40 | [rm -f conftest.sym conftest.file | |
41 | echo >conftest.file | |
4a626d0a PA |
42 | AC_RUN_IFELSE( |
43 | [AC_LANG_PROGRAM( | |
44 | [AC_INCLUDES_DEFAULT], | |
45 | [[struct stat sbuf; | |
46 | if (symlink ("conftest.file", "conftest.sym") != 0) | |
47 | return 1; | |
48 | /* Linux will dereference the symlink and fail, as required by | |
49 | POSIX. That is better in the sense that it means we will not | |
50 | have to compile and use the lstat wrapper. */ | |
51 | return lstat ("conftest.sym/", &sbuf) == 0; | |
52 | ]])], | |
53 | [gl_cv_func_lstat_dereferences_slashed_symlink=yes], | |
54 | [gl_cv_func_lstat_dereferences_slashed_symlink=no], | |
55 | [case "$host_os" in | |
c0c3707f CB |
56 | linux-* | linux) |
57 | # Guess yes on Linux systems. | |
58 | gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; | |
59 | *-gnu* | gnu*) | |
4a626d0a PA |
60 | # Guess yes on glibc systems. |
61 | gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; | |
c0c3707f CB |
62 | mingw*) |
63 | # Guess no on native Windows. | |
4a626d0a | 64 | gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;; |
c0c3707f CB |
65 | *) |
66 | # If we don't know, obey --enable-cross-guesses. | |
67 | gl_cv_func_lstat_dereferences_slashed_symlink="$gl_cross_guess_normal" ;; | |
4a626d0a PA |
68 | esac |
69 | ]) | |
f45c62c4 YQ |
70 | rm -f conftest.sym conftest.file |
71 | ]) | |
72 | case "$gl_cv_func_lstat_dereferences_slashed_symlink" in | |
73 | *yes) | |
74 | AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1], | |
75 | [Define to 1 if 'lstat' dereferences a symlink specified | |
76 | with a trailing slash.]) | |
77 | ;; | |
78 | esac | |
79 | ]) |