ci: tidy up config options

- No need to `--enable-bookmarkfs-util`, since it's implicitly done
  by enabling other components.
- No need to `--enable-xxhash-inline`, since it's now the default.

.builds/alpine.yml

@@ -31,8 +31,7 @@ tasks:
       cd bookmarkfs
       autoreconf -i
       ./configure  \
-          --enable-bookmarkfs-debug --enable-xxhash-inline     \
+          --enable-bookmarkfs-debug --enable-bookmarkfs-mount  \
-          --enable-bookmarkfs-util  --enable-bookmarkfs-mount  \
           --enable-bookmarkfs-fsck  --enable-bookmarkfs-mkfs   \
           --enable-bookmarkctl      --enable-fsck-handler-tcl  \
           --enable-backend-firefox  --enable-backend-chromium  \

.builds/archlinux.yml

@@ -25,8 +25,7 @@ tasks:
       mkdir bookmarkfs/build && cd bookmarkfs/build
       autoreconf -i ..
       ../configure  \
-          --enable-bookmarkfs-debug --enable-xxhash-inline     \
+          --enable-bookmarkfs-debug --enable-bookmarkfs-mount  \
-          --enable-bookmarkfs-util  --enable-bookmarkfs-mount  \
           --enable-bookmarkfs-fsck  --enable-bookmarkfs-mkfs   \
           --enable-bookmarkctl      --enable-fsck-handler-tcl  \
           --enable-backend-firefox  --enable-backend-chromium  \

.builds/debian.yml

@@ -28,8 +28,7 @@ tasks:
       mkdir bookmarkfs/build && cd bookmarkfs/build
       autoreconf -i ..
       ../configure  \
-          --enable-bookmarkfs-debug --enable-xxhash-inline     \
+          --enable-bookmarkfs-debug --enable-bookmarkfs-mount  \
-          --enable-bookmarkfs-util  --enable-bookmarkfs-mount  \
           --enable-bookmarkfs-fsck  --enable-bookmarkfs-mkfs   \
           --enable-bookmarkctl      --enable-fsck-handler-tcl  \
           --enable-backend-firefox  --enable-backend-chromium  \

.builds/freebsd.yml

@@ -31,8 +31,7 @@ tasks:
       mkdir bookmarkfs/build && cd bookmarkfs/build
       autoreconf -i ..
       ../configure  \
-          --enable-bookmarkfs-debug --enable-xxhash-inline     \
+          --enable-bookmarkfs-debug --enable-bookmarkfs-mount  \
-          --enable-bookmarkfs-util  --enable-bookmarkfs-mount  \
           --enable-bookmarkfs-fsck  --enable-bookmarkfs-mkfs   \
           --enable-bookmarkctl      --enable-fsck-handler-tcl  \
           --enable-backend-firefox  --enable-backend-chromium  \

INSTALL.md

@@ -104,8 +104,8 @@ Installation
     * No longer requires: libseccomp
   - `--disable-sandbox-landlock` (Linux-only)
     * Disable the [Landlock] feature in the sandbox implementation
-  - `--enable-xxhash-inline`
+  - `--disable-xxhash-inline`
-    * Use xxHash as a header-only library
+    * Do not use xxHash as a header-only library
   - `--disable-backend-firefox-write`
     * Build the Firefox backend without write features
     * No longer requires: Nettle, uriparser

configure.ac

@@ -61,7 +61,7 @@ AS_VAR_IF([host_os_is_linux], [yes], [
     EX_FEAT([sandbox-landlock], [yes], [Landlock features for sandboxing])
 ])
 
-EX_FEAT([xxhash-inline], [no], [using xxhash as a header-only library])
+EX_FEAT([xxhash-inline], [yes], [using xxhash as a header-only library])
 
 EX_FEAT([bookmarkfs-debug], [no], [debugging features for BookmarkFS])
 

doc/bookmarkfs.texi

@@ -302,8 +302,16 @@ Stay in the foreground, do not daemonize.
 @item -h
 Print help text, and then exit.
 
+If also given the @option{-o backend=@var{name}} option,
+print help text of the corresponding backend.
+This also applies to @command{fsck.bookmarkfs} and @command{mkfs.bookmarkfs}.
+
 @item -V
 Print version and feature information, and then exit.
+
+If also given the @option{-o backend=@var{name}} option,
+print version information of the corresponding backend.
+This also applies to @command{fsck.bookmarkfs} and @command{mkfs.bookmarkfs}.
 @end table
 
 Unrecognized options specified with @option{-o} are passed to libfuse
@@ -481,8 +489,14 @@ Also @pxref{Disabling Landlock}.
 @item -h
 Print help text, and then exit.
 
+If also given the @option{-o handler=@var{name}} option,
+print help text of the corresponding fsck handler.
+
 @item -V
 Print version and feature information, and then exit.
+
+If also given the @option{-o handler=@var{name}} option,
+print version information of the corresponding fsck handler.
 @end table
 
 

src/fsck_online.c

@@ -35,6 +35,7 @@
 #include "backend.h"
 #include "fsck_ops.h"
 #include "ioctl.h"
+#include "lib.h"
 #include "macros.h"
 #include "sandbox.h"
 #include "version.h"
@@ -202,6 +203,8 @@ print_version (void)
             BOOKMARKFS_VER_MAJOR, BOOKMARKFS_VER_MINOR, BOOKMARKFS_VER_PATCH);
     puts(BOOKMARKFS_FEATURE_STRING(DEBUG,            "debug"));
     puts(BOOKMARKFS_FEATURE_STRING(INTERACTIVE_FSCK, "interactive"));
+
+    bookmarkfs_print_lib_version("\n");
 }
 
 static int