c++: Rename new -flang-note-module-read option [PR 99166]

diff --git c/gcc/c-family/c.opt w/gcc/c-family/c.opt
index 3264c646ad3..64e46e7573e 100644
--- c/gcc/c-family/c.opt
+++ w/gcc/c-family/c.opt
@@ -1752,11 +1752,11 @@  flang-info-include-translate=
 C++ Joined RejectNegative MissingArgError(missing header name)
 Note a #include translation of a specific header.
 
-flang-info-module-read
-C++ Var(note_module_read_yes)
+flang-info-module-cmi
+C++ Var(note_module_cmi_yes)
 Note Compiled Module Interface pathnames.
 
-flang-info-module-read=
+flang-info-module-cmi=
 C++ Joined RejectNegative MissingArgError(missing module name)
 Note Compiled Module Interface pathname of a specific module or header-unit.
 
diff --git c/gcc/cp/module.cc w/gcc/cp/module.cc
index e576face0d8..0cb5bd9b644 100644
--- c/gcc/cp/module.cc
+++ w/gcc/cp/module.cc
@@ -3552,7 +3552,7 @@  class GTY((chain_next ("%h.parent"), for_user)) module_state {
 			   do it again  */
   bool call_init_p : 1; /* This module's global initializer needs
 			   calling.  */
-  bool inform_read_p : 1; /* Inform of a read.  */
+  bool inform_cmi_p : 1; /* Inform of a read/write.  */
   bool visited_p : 1;    /* A walk-once flag. */
   /* Record extensions emitted or permitted.  */
   unsigned extensions : SE_BITS;
@@ -3789,7 +3789,7 @@  module_state::module_state (tree name, module_state *parent, bool partition)
 
   partition_p = partition;
 
-  inform_read_p = false;
+  inform_cmi_p = false;
   visited_p = false;
 
   extensions = 0;
@@ -18699,7 +18699,7 @@  module_state::do_import (cpp_reader *reader, bool outermost)
     {
       const char *file = maybe_add_cmi_prefix (filename);
       dump () && dump ("CMI is %s", file);
-      if (note_module_read_yes || inform_read_p)
+      if (note_module_cmi_yes || inform_cmi_p)
 	inform (loc, "reading CMI %qs", file);
       fd = open (file, O_RDONLY | O_CLOEXEC | O_BINARY);
       e = errno;
@@ -19695,7 +19695,7 @@  init_modules (cpp_reader *reader)
 					       0, is_pathname, name, len);
 	  }
 	if (auto module = get_module (name))
-	  module->inform_read_p = 1;
+	  module->inform_cmi_p = 1;
 	else
 	  error ("invalid module name %qs", name);
       }
@@ -19903,6 +19903,8 @@  finish_module_processing (cpp_reader *reader)
 		  break;
 		create_dirs (tmp_name);
 	      }
+	  if (note_module_cmi_yes || state->inform_cmi_p)
+	    inform (state->loc, "writing CMI %qs", path);
 	  dump () && dump ("CMI is %s", path);
 	}
 
@@ -19915,7 +19917,7 @@  finish_module_processing (cpp_reader *reader)
 	  if (to.begin ())
 	    {
 	      auto loc = input_location;
-	      /* So crashes finger point the module decl.  */
+	      /* So crashes finger-point the module decl.  */
 	      input_location = state->loc;
 	      state->write (&to, reader);
 	      input_location = loc;
@@ -20085,7 +20087,7 @@  handle_module_option (unsigned code, const char *str, int)
       vec_safe_push (note_includes, str);
       return true;
 
-    case OPT_flang_info_module_read_:
+    case OPT_flang_info_module_cmi_:
       vec_safe_push (note_cmis, str);
       return true;
 
diff --git c/gcc/doc/invoke.texi w/gcc/doc/invoke.texi
index ea315f1be58..546e95453c1 100644
--- c/gcc/doc/invoke.texi
+++ w/gcc/doc/invoke.texi
@@ -242,7 +242,7 @@  in the following sections.
 -fext-numeric-literals @gol
 -flang-info-include-translate@r{[}=@var{header}@r{]} @gol
 -flang-info-include-translate-not @gol
--flang-info-module-read@r{[}=@var{module}@r{]} @gol
+-flang-info-module-cmi@r{[}=@var{module}@r{]} @gol
 -stdlib=@var{libstdc++,libc++} @gol
 -Wabi-tag  -Wcatch-value  -Wcatch-value=@var{n} @gol
 -Wno-class-conversion  -Wclass-memaccess @gol
@@ -3390,9 +3390,9 @@  translations relating to that specific header.  If @var{header} is of
 the form @code{"user"} or @code{<system>} it will be resolved to a
 specific user or system header using the include path.
 
-@item -flang-info-module-read
-@itemx -flang-info-module-read=@var{module}
-@opindex flang-info-module-read
+@item -flang-info-module-cmi
+@itemx -flang-info-module-cmi=@var{module}
+@opindex flang-info-module-cmi
 Inform of Compiled Module Interface pathnames.  The first will note
 all read CMI pathnames.  The @var{module} form will not reading a
 specific module's CMI.  @var{module} may be a named module or a
@@ -33063,7 +33063,7 @@  option may be helpful in determining whether include translation is
 happening---if it is working correctly, it behaves as if it isn't
 there at all.
 
-The @option{-flang-info-module-read} option can be used to determine
+The @option{-flang-info-module-cmi} option can be used to determine
 where the compiler is reading a CMI from.  Without the option, the
 compiler is silent when such a read is successful.  This option has an
 optional argument, which will restrict the notification to just the
@@ -33142,7 +33142,8 @@  pairs, one per line.  Only the mappings for the direct imports and any
 module export name need be provided.  If other mappings are provided,
 they override those stored in any imported CMI files.  A repository
 root may be specified in the mapping file by using @samp{$root} as the
-module name in the first active line.
+module name in the first active line.  Use of this option will disable
+any default module->CMI name mapping.
 
 @end table
 
diff --git c/gcc/testsuite/g++.dg/modules/pr99166_a.X w/gcc/testsuite/g++.dg/modules/pr99166_a.X
index ad7ce7edf45..0649d053b30 100644
--- c/gcc/testsuite/g++.dg/modules/pr99166_a.X
+++ w/gcc/testsuite/g++.dg/modules/pr99166_a.X
@@ -1,6 +1,7 @@ 
 // PR c++/99166, diagnostic
-// { dg-additional-options {-x c++-system-header iostream -fmodules-ts} }
+// { dg-additional-options {-x c++-system-header iostream -fmodules-ts -flang-info-module-cmi} }
 
+// { dg-regexp {[^\n]*iostream: note: writing CMI 'gcm.cache/[^[\n]*iostream.gcm'\n} }
 // { dg-prune-output {linker input file unused} }
 
 NO DO NOT COMPILE
diff --git c/gcc/testsuite/g++.dg/modules/pr99166_b.C w/gcc/testsuite/g++.dg/modules/pr99166_b.C
index 64c5a8647ec..ac20116e641 100644
--- c/gcc/testsuite/g++.dg/modules/pr99166_b.C
+++ w/gcc/testsuite/g++.dg/modules/pr99166_b.C
@@ -1,7 +1,7 @@ 
-// { dg-additional-options {-fmodules-ts -flang-info-module-read=<iostream>} }
+// { dg-additional-options {-fmodules-ts -flang-info-module-cmi=<iostream>} }
 export module Foo;
 import <iostream>;
 
 export void frob ();
 
-// { dg-regexp {In module imported at [^\n]*pr99166_b.C:[0-9:]*\n[^\b]*iostream: note: reading CMI 'gcm.cache/[^[\n]*iostream.gcm'\n} }
+// { dg-regexp {In module imported at [^\n]*pr99166_b.C:[0-9:]*\n[^\n]*iostream: note: reading CMI 'gcm.cache/[^[\n]*iostream.gcm'\n} }
diff --git c/gcc/testsuite/g++.dg/modules/pr99166_c.C w/gcc/testsuite/g++.dg/modules/pr99166_c.C
index d098f07279d..424aa1d108a 100644
--- c/gcc/testsuite/g++.dg/modules/pr99166_c.C
+++ w/gcc/testsuite/g++.dg/modules/pr99166_c.C
@@ -1,4 +1,4 @@ 
-// { dg-additional-options {-fmodules-ts -flang-info-module-read=Foo} }
+// { dg-additional-options {-fmodules-ts -flang-info-module-cmi=Foo} }
 module Foo;
 
-// { dg-regexp {In module imported at [^\n]*pr99166_c.C:[0-9:]*\n[^\b]*Foo: note: reading CMI 'gcm.cache/Foo.gcm'\n} }
+// { dg-regexp {In module imported at [^\n]*pr99166_c.C:[0-9:]*\n[^\n]*Foo: note: reading CMI 'gcm.cache/Foo.gcm'\n} }
diff --git c/gcc/testsuite/g++.dg/modules/pr99166_d.C w/gcc/testsuite/g++.dg/modules/pr99166_d.C
index 423053ec9ff..dbdfacc22a4 100644
--- c/gcc/testsuite/g++.dg/modules/pr99166_d.C
+++ w/gcc/testsuite/g++.dg/modules/pr99166_d.C
@@ -1,6 +1,6 @@ 
-// { dg-additional-options {-fmodules-ts -flang-info-module-read} }
+// { dg-additional-options {-fmodules-ts -flang-info-module-cmi} }
 import Foo;
 
-// { dg-regexp {In module imported at [^\n]*pr99166_d.C:[0-9:]*\n[^\b]*Foo: note: reading CMI 'gcm.cache/Foo.gcm'\n} }
+// { dg-regexp {In module imported at [^\n]*pr99166_d.C:[0-9:]*\n[^\n]*Foo: note: reading CMI 'gcm.cache/Foo.gcm'\n} }
 
-// { dg-regexp {In module imported at [^\n]*pr99166_b.C:[0-9:]*,\nof module Foo, imported at [^\n]*pr99166_d.C:[0-9:]:\n[^\b]*iostream: note: reading CMI 'gcm.cache/[^[\n]*iostream.gcm'\n} }
+// { dg-regexp {In module imported at [^\n]*pr99166_b.C:[0-9:]*,\nof module Foo, imported at [^\n]*pr99166_d.C:[0-9:]:\n[^\n]*iostream: note: reading CMI 'gcm.cache/[^[\n]*iostream.gcm'\n} }