-#serial 2
+# serial 26
+
+# Copyright (C) 1997-2001, 2003-2013 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
dnl From Jim Meyering.
-dnl Determine whether lstat has the bug that it succeeds when given the
-dnl zero-length file name argument. The lstat from SunOS4.1.4 and the Hurd
-dnl (as of 1998-11-01) do this.
-dnl
-dnl If it does, then define HAVE_LSTAT_EMPTY_STRING_BUG and arrange to
-dnl compile the wrapper function.
-dnl
-AC_DEFUN(jm_FUNC_LSTAT,
+AC_DEFUN([gl_FUNC_LSTAT],
[
- AC_CACHE_CHECK([whether lstat accepts an empty string],
- jm_cv_func_lstat_empty_string_bug,
- [AC_TRY_RUN([
-# include <sys/types.h>
-# include <sys/stat.h>
-
- int
- main ()
- {
- struct stat sbuf;
- exit (lstat ("", &sbuf) ? 1 : 0);
- }
- ],
- jm_cv_func_lstat_empty_string_bug=yes,
- jm_cv_func_lstat_empty_string_bug=no,
- dnl When crosscompiling, assume lstat is broken.
- jm_cv_func_lstat_empty_string_bug=yes)
- ])
- if test $jm_cv_func_lstat_empty_string_bug = yes; then
+ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+ dnl If lstat does not exist, the replacement <sys/stat.h> does
+ dnl "#define lstat stat", and lstat.c is a no-op.
+ AC_CHECK_FUNCS_ONCE([lstat])
+ if test $ac_cv_func_lstat = yes; then
+ AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+ case "$gl_cv_func_lstat_dereferences_slashed_symlink" in
+ *no)
+ REPLACE_LSTAT=1
+ ;;
+ esac
+ else
+ HAVE_LSTAT=0
+ fi
+])
- LIBOBJS="$LIBOBJS lstat.o"
+# Prerequisites of lib/lstat.c.
+AC_DEFUN([gl_PREREQ_LSTAT], [:])
- if test $jm_cv_func_lstat_empty_string_bug = yes; then
- if test x = y; then
- # This code is deliberately never run via ./configure.
- # FIXME: this is a hack to make autoheader put the corresponding
- # HAVE_* undef for this symbol in config.h.in. This saves me the
- # trouble of having to maintain the #undef in acconfig.h manually.
- AC_CHECK_FUNCS(LSTAT_EMPTY_STRING_BUG)
- fi
- # Defining it this way (rather than via AC_DEFINE) short-circuits the
- # autoheader check -- autoheader doesn't know it's already been taken
- # care of by the hack above.
- ac_kludge=HAVE_LSTAT_EMPTY_STRING_BUG
- AC_DEFINE_UNQUOTED($ac_kludge)
- fi
- fi
+AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK],
+[
+ dnl We don't use AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK any more, because it
+ dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ.
+ AC_CACHE_CHECK([whether lstat correctly handles trailing slash],
+ [gl_cv_func_lstat_dereferences_slashed_symlink],
+ [rm -f conftest.sym conftest.file
+ echo >conftest.file
+ if test "$as_ln_s" = "ln -s" && ln -s conftest.file conftest.sym; then
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [AC_INCLUDES_DEFAULT],
+ [[struct stat sbuf;
+ /* Linux will dereference the symlink and fail, as required by
+ POSIX. That is better in the sense that it means we will not
+ have to compile and use the lstat wrapper. */
+ return lstat ("conftest.sym/", &sbuf) == 0;
+ ]])],
+ [gl_cv_func_lstat_dereferences_slashed_symlink=yes],
+ [gl_cv_func_lstat_dereferences_slashed_symlink=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;;
+ esac
+ ])
+ else
+ # If the 'ln -s' command failed, then we probably don't even
+ # have an lstat function.
+ gl_cv_func_lstat_dereferences_slashed_symlink="guessing no"
+ fi
+ rm -f conftest.sym conftest.file
+ ])
+ case "$gl_cv_func_lstat_dereferences_slashed_symlink" in
+ *yes)
+ AC_DEFINE_UNQUOTED([LSTAT_FOLLOWS_SLASHED_SYMLINK], [1],
+ [Define to 1 if 'lstat' dereferences a symlink specified
+ with a trailing slash.])
+ ;;
+ esac
])
projects / gnulib.git / blobdiff