summaryrefslogtreecommitdiff
path: root/gnulib-m4/lstat.m4
diff options
context:
space:
mode:
Diffstat (limited to 'gnulib-m4/lstat.m4')
-rw-r--r--gnulib-m4/lstat.m479
1 files changed, 79 insertions, 0 deletions
diff --git a/gnulib-m4/lstat.m4 b/gnulib-m4/lstat.m4
new file mode 100644
index 00000000..d987060b
--- /dev/null
+++ b/gnulib-m4/lstat.m4
@@ -0,0 +1,79 @@
+# serial 33
+
+# Copyright (C) 1997-2001, 2003-2022 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.
+
+AC_DEFUN([gl_FUNC_LSTAT],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ 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 $host_os,$gl_cv_func_lstat_dereferences_slashed_symlink in
+ solaris* | *no)
+ REPLACE_LSTAT=1
+ ;;
+ esac
+ else
+ HAVE_LSTAT=0
+ fi
+])
+
+# Prerequisites of lib/lstat.c.
+AC_DEFUN([gl_PREREQ_LSTAT], [:])
+
+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+ dnl is no longer maintained in Autoconf and because it invokes AC_LIBOBJ.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_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ 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
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [AC_INCLUDES_DEFAULT],
+ [[struct stat sbuf;
+ if (symlink ("conftest.file", "conftest.sym") != 0)
+ return 1;
+ /* 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 "$host_os" in
+ linux-* | linux)
+ # Guess yes on Linux systems.
+ gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
+ *-gnu* | gnu*)
+ # Guess yes on glibc systems.
+ gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
+ mingw*)
+ # Guess no on native Windows.
+ gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;;
+ *)
+ # If we don't know, obey --enable-cross-guesses.
+ gl_cv_func_lstat_dereferences_slashed_symlink="$gl_cross_guess_normal" ;;
+ esac
+ ])
+ 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
+])