util/OptionParser: move to cmdline/

This library will depend on libfmt, and libutil shouldn't depend on
any library.

src/CommandLine.cxx

@@ -39,9 +39,9 @@
 #include "fs/StandardDirectory.hxx"
 #include "event/Features.h"
 #include "io/uring/Features.h"
+#include "cmdline/OptionDef.hxx"
+#include "cmdline/OptionParser.hxx"
 #include "util/Domain.hxx"
-#include "util/OptionDef.hxx"
-#include "util/OptionParser.hxx"
 #include "Version.h"
 
 #ifdef _WIN32

src/cmdline/meson.build

@@ -0,0 +1,9 @@
+cmdline = static_library(
+  'cmdline',
+  'OptionParser.cxx',
+  include_directories: inc,
+)
+
+cmdline_dep = declare_dependency(
+  link_with: cmdline,
+)

src/util/meson.build

@@ -22,7 +22,6 @@ util = static_library(
   'PeakBuffer.cxx',
   'PrintException.cxx',
   'SparseBuffer.cxx',
-  'OptionParser.cxx',
   'ByteReverse.cxx',
   'format.c',
   'BitReverse.cxx',