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70 lines
2.6 KiB
Plaintext
70 lines
2.6 KiB
Plaintext
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# serial 21
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# Copyright (C) 1997-2001, 2003-2011 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([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
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if test $ac_cv_func_lstat_dereferences_slashed_symlink = no; then
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dnl Note: AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK does AC_LIBOBJ([lstat]).
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REPLACE_LSTAT=1
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fi
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# Prerequisites of lib/lstat.c.
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AC_REQUIRE([AC_C_INLINE])
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else
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HAVE_LSTAT=0
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fi
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])
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# Redefine AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, because it is no longer
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# maintained in Autoconf.
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AC_DEFUN([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK],
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[
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AC_CACHE_CHECK([whether lstat correctly handles trailing slash],
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[ac_cv_func_lstat_dereferences_slashed_symlink],
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[rm -f conftest.sym conftest.file
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echo >conftest.file
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if test "$as_ln_s" = "ln -s" && ln -s conftest.file conftest.sym; then
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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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/* 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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[ac_cv_func_lstat_dereferences_slashed_symlink=yes],
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[ac_cv_func_lstat_dereferences_slashed_symlink=no],
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[# When cross-compiling, be pessimistic so we will end up using the
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# replacement version of lstat that checks for trailing slashes and
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# calls lstat a second time when necessary.
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ac_cv_func_lstat_dereferences_slashed_symlink=no
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])
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else
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# If the 'ln -s' command failed, then we probably don't even
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# have an lstat function.
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ac_cv_func_lstat_dereferences_slashed_symlink=no
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fi
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rm -f conftest.sym conftest.file
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])
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test $ac_cv_func_lstat_dereferences_slashed_symlink = yes &&
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AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1],
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[Define to 1 if `lstat' dereferences a symlink specified
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with a trailing slash.])
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if test "x$ac_cv_func_lstat_dereferences_slashed_symlink" = xno; then
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AC_LIBOBJ([lstat])
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fi
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])
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