.

diff --git a/m4/st_dm_mode.m4 b/m4/st_dm_mode.m4
new file mode 100644 (file)
index 0000000..823f9ed
--- /dev/null
+++ b/m4/st_dm_mode.m4
@@ -0,0 +1,25 @@
+# Define HAVE_ST_DM_MODE if struct stat has an st_dm_mode member.
+
+AC_DEFUN(AC_STRUCT_ST_DM_MODE,
+ [AC_CACHE_CHECK([for st_dm_mode in struct stat], ac_cv_struct_st_dm_mode,
+   [AC_TRY_COMPILE([#include <sys/types.h>
+#include <sys/stat.h>], [struct stat s; s.st_dm_mode;],
+     ac_cv_struct_st_dm_mode=yes,
+     ac_cv_struct_st_dm_mode=no)])
+
+  if test $ac_cv_struct_st_dm_mode = yes; then
+    if test x = y; then
+      # This code is deliberately never run via ./configure.
+      # FIXME: this is a hack to make autoheader put the corresponding
+      # HAVE_* undef for this symbol in config.h.in.  This saves me the
+      # trouble of having to add the #undef in acconfig.h manually.
+      AC_CHECK_FUNCS(ST_DM_MODE)
+    fi
+    # Defining it this way (rather than via AC_DEFINE) short-circuits the
+    # autoheader check -- autoheader doesn't know it's already been taken
+    # care of by the hack above.
+    ac_kludge=HAVE_ST_DM_MODE
+    AC_DEFINE_UNQUOTED($ac_kludge)
+  fi
+ ]
+)