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71 lines
2.4 KiB
71 lines
2.4 KiB
# serial 27 |
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# Copyright (C) 1997-2001, 2003-2017 Free Software Foundation, Inc. |
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# |
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# This file is free software; the Free Software Foundation |
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# gives unlimited permission to copy and/or distribute it, |
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# with or without modifications, as long as this notice is preserved. |
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dnl From Jim Meyering. |
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AC_DEFUN([gl_FUNC_LSTAT], |
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[ |
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AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS]) |
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dnl If lstat does not exist, the replacement <sys/stat.h> does |
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dnl "#define lstat stat", and lstat.c is a no-op. |
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AC_CHECK_FUNCS_ONCE([lstat]) |
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if test $ac_cv_func_lstat = yes; then |
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AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK]) |
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case "$gl_cv_func_lstat_dereferences_slashed_symlink" in |
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*no) |
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REPLACE_LSTAT=1 |
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;; |
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esac |
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else |
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HAVE_LSTAT=0 |
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fi |
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]) |
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# Prerequisites of lib/lstat.c. |
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AC_DEFUN([gl_PREREQ_LSTAT], [:]) |
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AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK], |
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[ |
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dnl We don't use AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK any more, because it |
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dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ. |
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AC_CACHE_CHECK([whether lstat correctly handles trailing slash], |
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[gl_cv_func_lstat_dereferences_slashed_symlink], |
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[rm -f conftest.sym conftest.file |
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echo >conftest.file |
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AC_RUN_IFELSE( |
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[AC_LANG_PROGRAM( |
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[AC_INCLUDES_DEFAULT], |
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[[struct stat sbuf; |
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if (symlink ("conftest.file", "conftest.sym") != 0) |
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return 1; |
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/* Linux will dereference the symlink and fail, as required by |
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POSIX. That is better in the sense that it means we will not |
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have to compile and use the lstat wrapper. */ |
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return lstat ("conftest.sym/", &sbuf) == 0; |
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]])], |
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[gl_cv_func_lstat_dereferences_slashed_symlink=yes], |
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[gl_cv_func_lstat_dereferences_slashed_symlink=no], |
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[case "$host_os" in |
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*-gnu*) |
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# Guess yes on glibc systems. |
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gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; |
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*) |
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# If we don't know, assume the worst. |
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gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;; |
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esac |
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]) |
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rm -f conftest.sym conftest.file |
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]) |
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case "$gl_cv_func_lstat_dereferences_slashed_symlink" in |
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*yes) |
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AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1], |
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[Define to 1 if 'lstat' dereferences a symlink specified |
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with a trailing slash.]) |
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;; |
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esac |
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])
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