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f0007cad | 1 | # serial 24 |
8912421c | 2 | |
f0007cad | 3 | # Copyright (C) 1997-2001, 2003-2012 Free Software Foundation, Inc. |
8912421c LC |
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 | |
231c0e0e | 18 | AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK]) |
3d458a81 | 19 | if test $gl_cv_func_lstat_dereferences_slashed_symlink = no; then |
8912421c LC |
20 | REPLACE_LSTAT=1 |
21 | fi | |
8912421c LC |
22 | else |
23 | HAVE_LSTAT=0 | |
24 | fi | |
25 | ]) | |
0f00f2c3 | 26 | |
3d458a81 AW |
27 | # Prerequisites of lib/lstat.c. |
28 | AC_DEFUN([gl_PREREQ_LSTAT], | |
0f00f2c3 | 29 | [ |
3d458a81 AW |
30 | AC_REQUIRE([AC_C_INLINE]) |
31 | : | |
32 | ]) | |
33 | ||
34 | AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK], | |
35 | [ | |
36 | dnl We don't use AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK any more, because it | |
37 | dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ. | |
0f00f2c3 | 38 | AC_CACHE_CHECK([whether lstat correctly handles trailing slash], |
3d458a81 | 39 | [gl_cv_func_lstat_dereferences_slashed_symlink], |
0f00f2c3 LC |
40 | [rm -f conftest.sym conftest.file |
41 | echo >conftest.file | |
42 | if test "$as_ln_s" = "ln -s" && ln -s conftest.file conftest.sym; then | |
43 | AC_RUN_IFELSE( | |
44 | [AC_LANG_PROGRAM( | |
45 | [AC_INCLUDES_DEFAULT], | |
46 | [[struct stat sbuf; | |
47 | /* Linux will dereference the symlink and fail, as required by | |
48 | POSIX. That is better in the sense that it means we will not | |
49 | have to compile and use the lstat wrapper. */ | |
50 | return lstat ("conftest.sym/", &sbuf) == 0; | |
51 | ]])], | |
3d458a81 AW |
52 | [gl_cv_func_lstat_dereferences_slashed_symlink=yes], |
53 | [gl_cv_func_lstat_dereferences_slashed_symlink=no], | |
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54 | [# When cross-compiling, be pessimistic so we will end up using the |
55 | # replacement version of lstat that checks for trailing slashes and | |
56 | # calls lstat a second time when necessary. | |
3d458a81 | 57 | gl_cv_func_lstat_dereferences_slashed_symlink=no |
0f00f2c3 LC |
58 | ]) |
59 | else | |
60 | # If the 'ln -s' command failed, then we probably don't even | |
61 | # have an lstat function. | |
3d458a81 | 62 | gl_cv_func_lstat_dereferences_slashed_symlink=no |
0f00f2c3 LC |
63 | fi |
64 | rm -f conftest.sym conftest.file | |
65 | ]) | |
3d458a81 | 66 | test $gl_cv_func_lstat_dereferences_slashed_symlink = yes && |
0f00f2c3 | 67 | AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1], |
f0007cad | 68 | [Define to 1 if 'lstat' dereferences a symlink specified |
0f00f2c3 | 69 | with a trailing slash.]) |
0f00f2c3 | 70 | ]) |