Add liburing dependency check for PAX storage

Add AC_CHECK_LIB check for liburing in the PAX dependency block
to detect missing liburing-devel early during configure phase.

PAX storage requires liburing for io_uring-based fast I/O. This
check prevents unclear linker errors during compilation.

Author: tuhaihe

configure

@@ -9463,6 +9463,55 @@ $as_echo "#define HAVE_ZSTD 1" >>confdefs.h
 
 fi
 
+  # Check liburing
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for io_uring_queue_init in -luring" >&5
+$as_echo_n "checking for io_uring_queue_init in -luring... " >&6; }
+if ${ac_cv_lib_uring_io_uring_queue_init+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-luring  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char io_uring_queue_init ();
+int
+main ()
+{
+return io_uring_queue_init ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_uring_io_uring_queue_init=yes
+else
+  ac_cv_lib_uring_io_uring_queue_init=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_uring_io_uring_queue_init" >&5
+$as_echo "$ac_cv_lib_uring_io_uring_queue_init" >&6; }
+if test "x$ac_cv_lib_uring_io_uring_queue_init" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBURING 1
+_ACEOF
+
+  LIBS="-luring $LIBS"
+
+else
+  as_fn_error $? "library 'uring' is required for PAX support" "$LINENO" 5
+fi
+
+
   # Check cmake >= 3.11.0 using AX_COMPARE_VERSION
   # Extract the first word of "cmake", so it can be a program name with args.
 set dummy cmake; ac_word=$2

configure.ac

@@ -972,6 +972,10 @@ if test "$enable_pax" = yes; then
     [AC_MSG_ERROR([libzstd >= 1.4.0 is required for PAX support])]
   )
 
+  # Check liburing
+  AC_CHECK_LIB(uring, io_uring_queue_init, [],
+               [AC_MSG_ERROR([library 'uring' is required for PAX support])])
+
   # Check cmake >= 3.11.0 using AX_COMPARE_VERSION
   AC_PATH_PROG([CMAKE], [cmake], [no])
   if test "$CMAKE" = "no"; then