No functional change intended.

gcc/c-family/ChangeLog:
        * c-opts.cc (c_diagnostic_text_finalizer): Add "m_" prefix to
        fields of diagnostic_info.

gcc/c/ChangeLog:
        * c-errors.cc: Update to add "m_" prefix to fields of
        diagnostic_info throughout.

gcc/cp/ChangeLog:
        * constexpr.cc: Update to add "m_" prefix to fields of
        diagnostic_info throughout.
        * error.cc: Likewise.

gcc/d/ChangeLog:
        * d-diagnostic.cc (d_diagnostic_report_diagnostic): Update to add
        "m_" prefix to fields of diagnostic_info throughout.

gcc/ChangeLog:
        * diagnostic.cc: Update to add "m_" prefix to fields of
        diagnostic_info throughout.
        * diagnostic.h: Likewise.
        * diagnostics/html-sink.cc: Likewise.
        * diagnostics/sarif-sink.cc: Likewise.
        * diagnostics/text-sink.cc: Likewise.
        * libgdiagnostics.cc: Likewise.
        * substring-locations.cc: Likewise.
        * tree-diagnostic.cc: Likewise.

gcc/fortran/ChangeLog:
        * error.cc: Update to add "m_" prefix to fields of
        diagnostic_info throughout.

gcc/testsuite/ChangeLog:
        * gcc.dg/plugin/diagnostic_plugin_test_show_locus.cc: Update to
        add "m_" prefix to fields of diagnostic_info throughout.
---
 gcc/c-family/c-opts.cc                        |   2 +-
 gcc/c/c-errors.cc                             |  20 ++--
 gcc/cp/constexpr.cc                           |   2 +-
 gcc/cp/error.cc                               |  10 +-
 gcc/d/d-diagnostic.cc                         |   2 +-
 gcc/diagnostic.cc                             | 112 +++++++++---------
 gcc/diagnostic.h                              |  31 +++--
 gcc/diagnostics/html-sink.cc                  |  30 ++---
 gcc/diagnostics/sarif-sink.cc                 |  28 ++---
 gcc/diagnostics/text-sink.cc                  |  36 +++---
 gcc/fortran/error.cc                          |  22 ++--
 gcc/libgdiagnostics.cc                        |   8 +-
 gcc/substring-locations.cc                    |   2 +-
 .../diagnostic_plugin_test_show_locus.cc      |   2 +-
 gcc/tree-diagnostic.cc                        |   2 +-
 15 files changed, 157 insertions(+), 152 deletions(-)

diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc
index 96130d71afdb..88353062db47 100644
--- a/gcc/c-family/c-opts.cc
+++ b/gcc/c-family/c-opts.cc
@@ -179,7 +179,7 @@ c_diagnostic_text_finalizer (diagnostics::text_sink 
&text_output,
   pp_newline (pp);
   diagnostic_show_locus (&text_output.get_context (),
                         text_output.get_source_printing_options (),
-                        diagnostic->richloc, diagnostic->kind, pp);
+                        diagnostic->m_richloc, diagnostic->m_kind, pp);
   /* By default print macro expansion contexts in the diagnostic
      finalizer -- for tokens resulting from macro expansion.  */
   diagnostics::virt_loc_aware_text_finalizer (text_output, diagnostic);
diff --git a/gcc/c/c-errors.cc b/gcc/c/c-errors.cc
index 4682dca56c2c..be3ad3d5cf1e 100644
--- a/gcc/c/c-errors.cc
+++ b/gcc/c/c-errors.cc
@@ -49,7 +49,7 @@ pedwarn_c23 (location_t location,
       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
                           (pedantic && !flag_isoc2y)
                           ? DK_PEDWARN : DK_WARNING);
-      diagnostic.option_id = OPT_Wc23_c2y_compat;
+      diagnostic.m_option_id = OPT_Wc23_c2y_compat;
       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
   /* -Wno-c23-c2y-compat suppresses even the pedwarns.  */
@@ -59,7 +59,7 @@ pedwarn_c23 (location_t location,
   else if (pedantic && !flag_isoc2y)
     {
       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, DK_PEDWARN);
-      diagnostic.option_id = option_id;
+      diagnostic.m_option_id = option_id;
       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
   va_end (ap);
@@ -95,9 +95,9 @@ pedwarn_c11 (location_t location,
                           (pedantic && !flag_isoc23)
                           ? DK_PEDWARN : DK_WARNING);
       if (option_id == OPT_Wpedantic)
-       diagnostic.option_id = OPT_Wc11_c23_compat;
+       diagnostic.m_option_id = OPT_Wc11_c23_compat;
       else
-       diagnostic.option_id = option_id;
+       diagnostic.m_option_id = option_id;
       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
   /* -Wno-c11-c23-compat suppresses even the pedwarns.  */
@@ -107,7 +107,7 @@ pedwarn_c11 (location_t location,
   else if (pedantic && !flag_isoc23)
     {
       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, DK_PEDWARN);
-      diagnostic.option_id = option_id;
+      diagnostic.m_option_id = option_id;
       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
   va_end (ap);
@@ -138,7 +138,7 @@ pedwarn_c99 (location_t location,
       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
                           (pedantic && !flag_isoc11)
                           ? DK_PEDWARN : DK_WARNING);
-      diagnostic.option_id = OPT_Wc99_c11_compat;
+      diagnostic.m_option_id = OPT_Wc99_c11_compat;
       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
   /* -Wno-c99-c11-compat suppresses even the pedwarns.  */
@@ -148,7 +148,7 @@ pedwarn_c99 (location_t location,
   else if (pedantic && !flag_isoc11)
     {
       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, DK_PEDWARN);
-      diagnostic.option_id = option_id;
+      diagnostic.m_option_id = option_id;
       warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
   va_end (ap);
@@ -184,7 +184,7 @@ pedwarn_c90 (location_t location,
          diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
                               (pedantic && !flag_isoc99)
                               ? DK_PEDWARN : DK_WARNING);
-         diagnostic.option_id = option_id;
+         diagnostic.m_option_id = option_id;
          diagnostic_report_diagnostic (global_dc, &diagnostic);
          warned = true;
          goto out;
@@ -197,7 +197,7 @@ pedwarn_c90 (location_t location,
       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
                           (pedantic && !flag_isoc99)
                           ? DK_PEDWARN : DK_WARNING);
-      diagnostic.option_id = OPT_Wc90_c99_compat;
+      diagnostic.m_option_id = OPT_Wc90_c99_compat;
       diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
   /* -Wno-c90-c99-compat suppresses the pedwarns.  */
@@ -207,7 +207,7 @@ pedwarn_c90 (location_t location,
   else if (pedantic && !flag_isoc99)
     {
       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc, DK_PEDWARN);
-      diagnostic.option_id = option_id;
+      diagnostic.m_option_id = option_id;
       diagnostic_report_diagnostic (global_dc, &diagnostic);
       warned = true;
     }
diff --git a/gcc/cp/constexpr.cc b/gcc/cp/constexpr.cc
index 3d52297656f3..b83d3701926b 100644
--- a/gcc/cp/constexpr.cc
+++ b/gcc/cp/constexpr.cc
@@ -168,7 +168,7 @@ constexpr_error (location_t location, bool 
constexpr_fundef_p,
     {
       diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
                           cxx_dialect < cxx23 ? DK_PEDWARN : DK_WARNING);
-      diagnostic.option_id = OPT_Winvalid_constexpr;
+      diagnostic.m_option_id = OPT_Winvalid_constexpr;
       ret = diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
   else
diff --git a/gcc/cp/error.cc b/gcc/cp/error.cc
index a93a77026faa..555d8894f07e 100644
--- a/gcc/cp/error.cc
+++ b/gcc/cp/error.cc
@@ -253,13 +253,13 @@ static void
 cp_adjust_diagnostic_info (diagnostic_context *context,
                           diagnostic_info *diagnostic)
 {
-  if (diagnostic->kind == DK_ERROR)
+  if (diagnostic->m_kind == DK_ERROR)
     if (tree tmpl = get_current_template ())
       {
-       diagnostic->option_id = OPT_Wtemplate_body;
+       diagnostic->m_option_id = OPT_Wtemplate_body;
 
        if (context->m_permissive)
-         diagnostic->kind = DK_WARNING;
+         diagnostic->m_kind = DK_WARNING;
 
        bool existed;
        location_t &error_loc
@@ -269,7 +269,7 @@ cp_adjust_diagnostic_info (diagnostic_context *context,
          /* Remember that this template had a parse-time error so
             that we'll ensure a hard error has been issued upon
             its instantiation.  */
-         error_loc = diagnostic->richloc->get_loc ();
+         error_loc = diagnostic->m_richloc->get_loc ();
       }
 }
 
@@ -4940,7 +4940,7 @@ pedwarn_cxx98 (location_t location,
   va_start (ap, gmsgid);
   diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
                       (cxx_dialect == cxx98) ? DK_PEDWARN : DK_WARNING);
-  diagnostic.option_id = option_id;
+  diagnostic.m_option_id = option_id;
   ret = diagnostic_report_diagnostic (global_dc, &diagnostic);
   va_end (ap);
   return ret;
diff --git a/gcc/d/d-diagnostic.cc b/gcc/d/d-diagnostic.cc
index 55cb42ed7ae4..f7e380b1119a 100644
--- a/gcc/d/d-diagnostic.cc
+++ b/gcc/d/d-diagnostic.cc
@@ -199,7 +199,7 @@ d_diagnostic_report_diagnostic (const SourceLoc &loc, int 
opt,
       diagnostic_set_info_translated (&diagnostic, xformat, &argp,
                                      &rich_loc, kind);
       if (opt != 0)
-       diagnostic.option_id = opt;
+       diagnostic.m_option_id = opt;
 
       diagnostic_report_diagnostic (global_dc, &diagnostic);
     }
diff --git a/gcc/diagnostic.cc b/gcc/diagnostic.cc
index b5ef93e70bc4..8ebed0bf51a9 100644
--- a/gcc/diagnostic.cc
+++ b/gcc/diagnostic.cc
@@ -672,14 +672,14 @@ diagnostic_set_info_translated (diagnostic_info 
*diagnostic, const char *msg,
                                diagnostic_t kind)
 {
   gcc_assert (richloc);
-  diagnostic->message.m_err_no = errno;
-  diagnostic->message.m_args_ptr = args;
-  diagnostic->message.m_format_spec = msg;
-  diagnostic->message.m_richloc = richloc;
-  diagnostic->richloc = richloc;
-  diagnostic->metadata = nullptr;
-  diagnostic->kind = kind;
-  diagnostic->option_id = 0;
+  diagnostic->m_message.m_err_no = errno;
+  diagnostic->m_message.m_args_ptr = args;
+  diagnostic->m_message.m_format_spec = msg;
+  diagnostic->m_message.m_richloc = richloc;
+  diagnostic->m_richloc = richloc;
+  diagnostic->m_metadata = nullptr;
+  diagnostic->m_kind = kind;
+  diagnostic->m_option_id = 0;
 }
 
 /* Initialize DIAGNOSTIC, where the message GMSGID has not yet been
@@ -1279,11 +1279,11 @@ update_effective_level_from_pragmas (diagnostic_info 
*diagnostic) const
 
          diagnostic_option_id option = p->option;
          /* The option 0 is for all the diagnostics.  */
-         if (option == 0 || option == diagnostic->option_id)
+         if (option == 0 || option == diagnostic->m_option_id)
            {
              diagnostic_t kind = p->kind;
              if (kind != DK_UNSPECIFIED)
-               diagnostic->kind = kind;
+               diagnostic->m_kind = kind;
              return kind;
            }
        }
@@ -1311,13 +1311,13 @@ diagnostic_context::diagnostic_enabled (diagnostic_info 
*diagnostic)
   get_any_inlining_info (diagnostic);
 
   /* Diagnostics with no option or -fpermissive are always enabled.  */
-  if (!diagnostic->option_id.m_idx
-      || diagnostic->option_id == m_opt_permissive)
+  if (!diagnostic->m_option_id.m_idx
+      || diagnostic->m_option_id == m_opt_permissive)
     return true;
 
   /* This tests if the user provided the appropriate -Wfoo or
      -Wno-foo option.  */
-  if (!option_enabled_p (diagnostic->option_id))
+  if (!option_enabled_p (diagnostic->m_option_id))
     return false;
 
   /* This tests for #pragma diagnostic changes.  */
@@ -1327,20 +1327,20 @@ diagnostic_context::diagnostic_enabled (diagnostic_info 
*diagnostic)
   /* This tests if the user provided the appropriate -Werror=foo
      option.  */
   if (diag_class == DK_UNSPECIFIED
-      && !option_unspecified_p (diagnostic->option_id))
+      && !option_unspecified_p (diagnostic->m_option_id))
     {
       const diagnostic_t new_kind
-       = m_option_classifier.get_current_override (diagnostic->option_id);
+       = m_option_classifier.get_current_override (diagnostic->m_option_id);
       if (new_kind != DK_ANY)
        /* DK_ANY means the diagnostic is not to be ignored, but we don't want
           to change it specifically to DK_ERROR or DK_WARNING; we want to
           preserve whatever the caller has specified.  */
-       diagnostic->kind = new_kind;
+       diagnostic->m_kind = new_kind;
     }
 
   /* This allows for future extensions, like temporarily disabling
      warnings for ranges of source code.  */
-  if (diagnostic->kind == DK_IGNORED)
+  if (diagnostic->m_kind == DK_IGNORED)
     return false;
 
   return true;
@@ -1357,10 +1357,10 @@ diagnostic_context::warning_enabled_at (location_t loc,
 
   rich_location richloc (line_table, loc);
   diagnostic_info diagnostic = {};
-  diagnostic.option_id = option_id;
-  diagnostic.richloc = &richloc;
-  diagnostic.message.m_richloc = &richloc;
-  diagnostic.kind = DK_WARNING;
+  diagnostic.m_option_id = option_id;
+  diagnostic.m_richloc = &richloc;
+  diagnostic.m_message.m_richloc = &richloc;
+  diagnostic.m_kind = DK_WARNING;
   return diagnostic_enabled (&diagnostic);
 }
 
@@ -1416,7 +1416,7 @@ emit_diagnostic_with_group_va (diagnostic_t kind,
 bool
 diagnostic_context::report_diagnostic (diagnostic_info *diagnostic)
 {
-  diagnostic_t orig_diag_kind = diagnostic->kind;
+  diagnostic_t orig_diag_kind = diagnostic->m_kind;
 
   /* Every call to report_diagnostic should be within a
      begin_group/end_group pair so that output formats can reliably
@@ -1425,8 +1425,8 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
 
   /* Give preference to being able to inhibit warnings, before they
      get reclassified to something else.  */
-  bool was_warning = (diagnostic->kind == DK_WARNING
-                     || diagnostic->kind == DK_PEDWARN);
+  bool was_warning = (diagnostic->m_kind == DK_WARNING
+                     || diagnostic->m_kind == DK_PEDWARN);
   if (was_warning && m_inhibit_warnings)
     {
       inhibit_notes_in_group ();
@@ -1436,15 +1436,15 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
   if (m_adjust_diagnostic_info)
     m_adjust_diagnostic_info (this, diagnostic);
 
-  if (diagnostic->kind == DK_PEDWARN)
+  if (diagnostic->m_kind == DK_PEDWARN)
     {
-      diagnostic->kind = m_pedantic_errors ? DK_ERROR : DK_WARNING;
+      diagnostic->m_kind = m_pedantic_errors ? DK_ERROR : DK_WARNING;
 
       /* We do this to avoid giving the message for -pedantic-errors.  */
-      orig_diag_kind = diagnostic->kind;
+      orig_diag_kind = diagnostic->m_kind;
     }
 
-  if (diagnostic->kind == DK_NOTE && m_inhibit_notes_p)
+  if (diagnostic->m_kind == DK_NOTE && m_inhibit_notes_p)
     return false;
 
   /* If the user requested that warnings be treated as errors, so be
@@ -1452,10 +1452,10 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
      individual warnings can be overridden back to warnings with
      -Wno-error=*.  */
   if (m_warning_as_error_requested
-      && diagnostic->kind == DK_WARNING)
-    diagnostic->kind = DK_ERROR;
+      && diagnostic->m_kind == DK_WARNING)
+    diagnostic->m_kind = DK_ERROR;
 
-  diagnostic->message.m_data = &diagnostic->x_data;
+  diagnostic->m_message.m_data = &diagnostic->m_x_data;
 
   /* Check to see if the diagnostic is enabled at the location and
      not disabled by #pragma GCC diagnostic anywhere along the inlining
@@ -1466,7 +1466,7 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
       return false;
     }
 
-  if ((was_warning || diagnostic->kind == DK_WARNING)
+  if ((was_warning || diagnostic->m_kind == DK_WARNING)
       && ((!m_warn_system_headers
           && diagnostic->m_iinfo.m_allsyslocs)
          || m_inhibit_warnings))
@@ -1474,11 +1474,11 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
        inlining stack (if there is one) are in system headers.  */
     return false;
 
-  if (diagnostic->kind == DK_NOTE && notes_inhibited_in_group ())
+  if (diagnostic->m_kind == DK_NOTE && notes_inhibited_in_group ())
     /* Bail for all the notes in the diagnostic_group that started to inhibit 
notes.  */
     return false;
 
-  if (diagnostic->kind != DK_NOTE && diagnostic->kind != DK_ICE)
+  if (diagnostic->m_kind != DK_NOTE && diagnostic->m_kind != DK_ICE)
     check_max_errors (false);
 
   if (m_lock > 0)
@@ -1486,7 +1486,7 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
       /* If we're reporting an ICE in the middle of some other error,
         try to flush out the previous error, then let this one
         through.  Don't do this more than once.  */
-      if ((diagnostic->kind == DK_ICE || diagnostic->kind == DK_ICE_NOBT)
+      if ((diagnostic->m_kind == DK_ICE || diagnostic->m_kind == DK_ICE_NOBT)
          && m_lock == 1)
        pp_newline_and_flush (m_reference_printer);
       else
@@ -1498,7 +1498,7 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
 
   m_lock++;
 
-  if (diagnostic->kind == DK_ICE || diagnostic->kind == DK_ICE_NOBT)
+  if (diagnostic->m_kind == DK_ICE || diagnostic->m_kind == DK_ICE_NOBT)
     {
       /* When not checking, ICEs are converted to fatal errors when an
         error has already occurred.  This is counteracted by
@@ -1516,17 +1516,17 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
        }
       if (m_internal_error)
        (*m_internal_error) (this,
-                            diagnostic->message.m_format_spec,
-                            diagnostic->message.m_args_ptr);
+                            diagnostic->m_message.m_format_spec,
+                            diagnostic->m_message.m_args_ptr);
     }
 
   /* Increment the counter for the appropriate diagnostic kind, either
      within this context, or within the diagnostic_buffer.  */
   {
     const diagnostic_t kind_for_count =
-      ((diagnostic->kind == DK_ERROR && orig_diag_kind == DK_WARNING)
+      ((diagnostic->m_kind == DK_ERROR && orig_diag_kind == DK_WARNING)
        ? DK_WERROR
-       : diagnostic->kind);
+       : diagnostic->m_kind);
     diagnostic_counters &counters
       = (m_diagnostic_buffer
         ? m_diagnostic_buffer->m_diagnostic_counters
@@ -1540,7 +1540,7 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
       sink_->on_begin_group ();
   m_diagnostic_groups.m_emission_count++;
 
-  va_list *orig_args = diagnostic->message.m_args_ptr;
+  va_list *orig_args = diagnostic->m_message.m_args_ptr;
   for (auto sink_ : m_sinks)
     {
       /* Formatting the message is done per-output-format,
@@ -1560,8 +1560,8 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
         so that each has its own set to consume.  */
       va_list copied_args;
       va_copy (copied_args, *orig_args);
-      diagnostic->message.m_args_ptr = &copied_args;
-      pp_format (sink_->get_printer (), &diagnostic->message);
+      diagnostic->m_message.m_args_ptr = &copied_args;
+      pp_format (sink_->get_printer (), &diagnostic->m_message);
       va_end (copied_args);
 
       /* Call vfunc in the output format.  This is responsible for
@@ -1575,29 +1575,29 @@ diagnostic_context::report_diagnostic (diagnostic_info 
*diagnostic)
       break;
     case EXTRA_DIAGNOSTIC_OUTPUT_fixits_v1:
       print_parseable_fixits (get_file_cache (),
-                             m_reference_printer, diagnostic->richloc,
+                             m_reference_printer, diagnostic->m_richloc,
                              DIAGNOSTICS_COLUMN_UNIT_BYTE,
                              m_tabstop);
       pp_flush (m_reference_printer);
       break;
     case EXTRA_DIAGNOSTIC_OUTPUT_fixits_v2:
       print_parseable_fixits (get_file_cache (),
-                             m_reference_printer, diagnostic->richloc,
+                             m_reference_printer, diagnostic->m_richloc,
                              DIAGNOSTICS_COLUMN_UNIT_DISPLAY,
                              m_tabstop);
       pp_flush (m_reference_printer);
       break;
     }
   if (m_diagnostic_buffer == nullptr
-      || diagnostic->kind == DK_ICE
-      || diagnostic->kind == DK_ICE_NOBT)
-    action_after_output (diagnostic->kind);
-  diagnostic->x_data = nullptr;
+      || diagnostic->m_kind == DK_ICE
+      || diagnostic->m_kind == DK_ICE_NOBT)
+    action_after_output (diagnostic->m_kind);
+  diagnostic->m_x_data = nullptr;
 
   if (m_edit_context_ptr)
-    if (diagnostic->richloc->fixits_can_be_auto_applied_p ())
+    if (diagnostic->m_richloc->fixits_can_be_auto_applied_p ())
       if (!m_diagnostic_buffer)
-       m_edit_context_ptr->add_fixits (diagnostic->richloc);
+       m_edit_context_ptr->add_fixits (diagnostic->m_richloc);
 
   m_lock--;
 
@@ -1696,15 +1696,15 @@ diagnostic_context::diagnostic_impl (rich_location 
*richloc,
     {
       diagnostic_set_info (&diagnostic, gmsgid, ap, richloc,
                           m_permissive ? DK_WARNING : DK_ERROR);
-      diagnostic.option_id = (option_id.m_idx != -1 ? option_id : 
m_opt_permissive);
+      diagnostic.m_option_id = (option_id.m_idx != -1 ? option_id : 
m_opt_permissive);
     }
   else
     {
       diagnostic_set_info (&diagnostic, gmsgid, ap, richloc, kind);
       if (kind == DK_WARNING || kind == DK_PEDWARN)
-       diagnostic.option_id = option_id;
+       diagnostic.m_option_id = option_id;
     }
-  diagnostic.metadata = metadata;
+  diagnostic.m_metadata = metadata;
   return report_diagnostic (&diagnostic);
 }
 
@@ -1733,8 +1733,8 @@ diagnostic_context::diagnostic_n_impl (rich_location 
*richloc,
   const char *text = ngettext (singular_gmsgid, plural_gmsgid, gtn);
   diagnostic_set_info_translated (&diagnostic, text, ap, richloc, kind);
   if (kind == DK_WARNING)
-    diagnostic.option_id = option_id;
-  diagnostic.metadata = metadata;
+    diagnostic.m_option_id = option_id;
+  diagnostic.m_metadata = metadata;
   return report_diagnostic (&diagnostic);
 }
 
diff --git a/gcc/diagnostic.h b/gcc/diagnostic.h
index 43732bba3218..3bf51aab7ce5 100644
--- a/gcc/diagnostic.h
+++ b/gcc/diagnostic.h
@@ -158,26 +158,31 @@ enum diagnostic_text_art_charset
 struct diagnostic_info
 {
   diagnostic_info ()
-    : message (), richloc (), metadata (), x_data (), kind (), option_id (),
-      m_iinfo ()
+  : m_message (),
+    m_richloc (),
+    m_metadata (),
+    m_x_data (),
+    m_kind (),
+    m_option_id (),
+    m_iinfo ()
   { }
 
   /* Text to be formatted.  */
-  text_info message;
+  text_info m_message;
 
   /* The location at which the diagnostic is to be reported.  */
-  rich_location *richloc;
+  rich_location *m_richloc;
 
   /* An optional bundle of metadata associated with the diagnostic
      (or NULL).  */
-  const diagnostics::metadata *metadata;
+  const diagnostics::metadata *m_metadata;
 
   /* Auxiliary data for client.  */
-  void *x_data;
+  void *m_x_data;
   /* The kind of diagnostic it is about.  */
-  diagnostic_t kind;
+  diagnostic_t m_kind;
   /* Which OPT_* directly controls this diagnostic.  */
-  diagnostic_option_id option_id;
+  diagnostic_option_id m_option_id;
 
   /* Inlining context containing locations for each call site along
      the inlining stack.  */
@@ -1153,7 +1158,7 @@ diagnostic_text_finalizer (diagnostic_context *context)
 
 /* Extension hooks for client.  */
 #define diagnostic_context_auxiliary_data(DC) (DC)->m_client_aux_data
-#define diagnostic_info_auxiliary_data(DI) (DI)->x_data
+#define diagnostic_info_auxiliary_data(DI) (DI)->m_x_data
 
 /* This diagnostic_context is used by front-ends that directly output
    diagnostic messages without going through `error', `warning',
@@ -1182,7 +1187,7 @@ inline void
 diagnostic_set_option_id (diagnostic_info *info,
                          diagnostic_option_id option_id)
 {
-  info->option_id = option_id;
+  info->m_option_id = option_id;
 }
 
 /* Diagnostic related functions.  */
@@ -1335,7 +1340,7 @@ int get_terminal_width (void);
 inline location_t
 diagnostic_location (const diagnostic_info * diagnostic, int which = 0)
 {
-  return diagnostic->message.get_location (which);
+  return diagnostic->m_message.get_location (which);
 }
 
 /* Return the number of locations to be printed in DIAGNOSTIC.  */
@@ -1343,7 +1348,7 @@ diagnostic_location (const diagnostic_info * diagnostic, 
int which = 0)
 inline unsigned int
 diagnostic_num_locations (const diagnostic_info * diagnostic)
 {
-  return diagnostic->message.m_richloc->get_num_locations ();
+  return diagnostic->m_message.m_richloc->get_num_locations ();
 }
 
 /* Expand the location of this diagnostic. Use this function for
@@ -1353,7 +1358,7 @@ diagnostic_num_locations (const diagnostic_info * 
diagnostic)
 inline expanded_location
 diagnostic_expand_location (const diagnostic_info * diagnostic, int which = 0)
 {
-  return diagnostic->richloc->get_expanded_location (which);
+  return diagnostic->m_richloc->get_expanded_location (which);
 }
 
 /* This is somehow the right-side margin of a caret line, that is, we
diff --git a/gcc/diagnostics/html-sink.cc b/gcc/diagnostics/html-sink.cc
index 2075a6cf71b5..5b80de15a633 100644
--- a/gcc/diagnostics/html-sink.cc
+++ b/gcc/diagnostics/html-sink.cc
@@ -499,7 +499,7 @@ html_builder::on_report_diagnostic (const diagnostic_info 
&diagnostic,
                                    diagnostic_t orig_diag_kind,
                                    html_sink_buffer *buffer)
 {
-  if (diagnostic.kind == DK_ICE || diagnostic.kind == DK_ICE_NOBT)
+  if (diagnostic.m_kind == DK_ICE || diagnostic.m_kind == DK_ICE_NOBT)
     {
       /* Print a header for the remaining output to stderr, and
         return, attempting to print the usual ICE messages to
@@ -970,7 +970,7 @@ html_builder::make_element_for_diagnostic (const 
diagnostic_info &diagnostic,
   diag_element->set_attr ("id", diag_id);
   if (alert)
     diag_element->set_attr ("class",
-                           get_pf_class_for_alert_div (diagnostic.kind));
+                           get_pf_class_for_alert_div (diagnostic.m_kind));
 
   xml::printer xp (*diag_element.get ());
   const size_t depth_within_alert_div = 1;
@@ -980,7 +980,7 @@ html_builder::make_element_for_diagnostic (const 
diagnostic_info &diagnostic,
   if (alert)
     {
       xp.push_tag_with_class ("span",
-                             get_pf_class_for_alert_icon (diagnostic.kind),
+                             get_pf_class_for_alert_icon (diagnostic.m_kind),
                              true);
       xp.add_text (" ");
       xp.pop_tag ("span");
@@ -1004,7 +1004,7 @@ html_builder::make_element_for_diagnostic (const 
diagnostic_info &diagnostic,
   if (show_severity)
   {
     xp.push_tag ("strong");
-    xp.add_text (_(get_diagnostic_kind_text (diagnostic.kind)));
+    xp.add_text (_(get_diagnostic_kind_text (diagnostic.m_kind)));
     xp.pop_tag ("strong");
     xp.add_text (" ");
   }
@@ -1017,21 +1017,21 @@ html_builder::make_element_for_diagnostic (const 
diagnostic_info &diagnostic,
   pp_clear_output_area (m_printer);
 
   // Add any metadata as a suffix to the message
-  if (diagnostic.metadata)
+  if (diagnostic.m_metadata)
     {
       xp.add_text (" ");
-      xp.append (make_element_for_metadata (*diagnostic.metadata));
+      xp.append (make_element_for_metadata (*diagnostic.m_metadata));
     }
 
   // Add any option as a suffix to the message
 
   label_text option_text = label_text::take
-    (m_context.make_option_name (diagnostic.option_id,
-                                orig_diag_kind, diagnostic.kind));
+    (m_context.make_option_name (diagnostic.m_option_id,
+                                orig_diag_kind, diagnostic.m_kind));
   if (option_text.get ())
     {
       label_text option_url = label_text::take
-       (m_context.make_option_url (diagnostic.option_id));
+       (m_context.make_option_url (diagnostic.m_option_id));
 
       xp.add_text (" ");
       auto option_span = make_span ("gcc-option");
@@ -1102,9 +1102,9 @@ html_builder::make_element_for_diagnostic (const 
diagnostic_info &diagnostic,
     // TODO: m_context.m_last_location should be moved into the sink
     location_t saved = m_context.m_last_location;
     m_context.m_last_location = m_last_location;
-    m_context.maybe_show_locus_as_html (*diagnostic.richloc,
+    m_context.maybe_show_locus_as_html (*diagnostic.m_richloc,
                                        m_context.m_source_printing,
-                                       diagnostic.kind,
+                                       diagnostic.m_kind,
                                        xp,
                                        nullptr,
                                        nullptr);
@@ -1115,7 +1115,7 @@ html_builder::make_element_for_diagnostic (const 
diagnostic_info &diagnostic,
   gcc_assert (xp.get_num_open_tags () == depth_within_alert_div);
 
   /* Execution path.  */
-  if (auto path = diagnostic.richloc->get_path ())
+  if (auto path = diagnostic.m_richloc->get_path ())
     {
       xp.push_tag ("div");
       xp.set_attr ("id", "execution-path");
@@ -1144,8 +1144,8 @@ html_builder::make_element_for_diagnostic (const 
diagnostic_info &diagnostic,
   gcc_assert (xp.get_num_open_tags () == depth_within_alert_div);
 
   // Try to display any per-diagnostic graphs
-  if (diagnostic.metadata)
-    if (auto ldg = diagnostic.metadata->get_lazy_digraphs ())
+  if (diagnostic.m_metadata)
+    if (auto ldg = diagnostic.m_metadata->get_lazy_digraphs ())
       {
        auto &digraphs = ldg->get_or_create_digraphs ();
        for (auto &dg : digraphs)
@@ -1170,7 +1170,7 @@ std::unique_ptr<xml::element>
 html_builder::make_element_for_patch (const diagnostic_info &diagnostic)
 {
   edit_context ec (m_context.get_file_cache ());
-  ec.add_fixits (diagnostic.richloc);
+  ec.add_fixits (diagnostic.m_richloc);
   if (char *diff = ec.generate_diff (true))
     {
       if (strlen (diff) > 0)
diff --git a/gcc/diagnostics/sarif-sink.cc b/gcc/diagnostics/sarif-sink.cc
index d8b1d52906f0..fddf3dbdc456 100644
--- a/gcc/diagnostics/sarif-sink.cc
+++ b/gcc/diagnostics/sarif-sink.cc
@@ -1314,7 +1314,7 @@ sarif_result::on_nested_diagnostic (const diagnostic_info 
&diagnostic,
      sometimes these will related to current_function_decl, but
      often they won't.  */
   auto location_obj
-    = builder.make_location_object (this, *diagnostic.richloc,
+    = builder.make_location_object (this, *diagnostic.m_richloc,
                                    logical_locations::key (),
                                    diagnostic_artifact_role::result_file);
   auto message_obj
@@ -1845,7 +1845,7 @@ sarif_builder::on_report_diagnostic (const 
diagnostic_info &diagnostic,
 {
   pp_output_formatted_text (m_printer, m_context.get_urlifier ());
 
-  if (diagnostic.kind == DK_ICE || diagnostic.kind == DK_ICE_NOBT)
+  if (diagnostic.m_kind == DK_ICE || diagnostic.m_kind == DK_ICE_NOBT)
     {
       std::unique_ptr<json::object> stack = make_stack_from_backtrace ();
       m_invocation_obj->add_notification_for_ice (diagnostic, *this,
@@ -1995,8 +1995,8 @@ sarif_builder::make_result_object (const diagnostic_info 
&diagnostic,
   /* "ruleId" property (SARIF v2.1.0 section 3.27.5).  */
   /* Ideally we'd have an option_name for these.  */
   if (char *option_text
-       = m_context.make_option_name (diagnostic.option_id,
-                                     orig_diag_kind, diagnostic.kind))
+       = m_context.make_option_name (diagnostic.m_option_id,
+                                     orig_diag_kind, diagnostic.m_kind))
     {
       /* Lazily create reportingDescriptor objects for and add to m_rules_arr.
         Set ruleId referencing them.  */
@@ -2026,10 +2026,10 @@ sarif_builder::make_result_object (const 
diagnostic_info &diagnostic,
       free (rule_id);
     }
 
-  if (diagnostic.metadata)
+  if (diagnostic.m_metadata)
     {
       /* "taxa" property (SARIF v2.1.0 section 3.27.8).  */
-      if (int cwe_id = diagnostic.metadata->get_cwe ())
+      if (int cwe_id = diagnostic.m_metadata->get_cwe ())
        {
          auto taxa_arr = std::make_unique<json::array> ();
          taxa_arr->append<sarif_reporting_descriptor_reference>
@@ -2037,13 +2037,13 @@ sarif_builder::make_result_object (const 
diagnostic_info &diagnostic,
          result_obj->set<json::array> ("taxa", std::move (taxa_arr));
        }
 
-      diagnostic.metadata->maybe_add_sarif_properties (*result_obj);
+      diagnostic.m_metadata->maybe_add_sarif_properties (*result_obj);
 
       /* We don't yet support diagnostics::metadata::rule.  */
     }
 
   /* "level" property (SARIF v2.1.0 section 3.27.10).  */
-  if (const char *sarif_level = maybe_get_sarif_level (diagnostic.kind))
+  if (const char *sarif_level = maybe_get_sarif_level (diagnostic.m_kind))
     result_obj->set_string ("level", sarif_level);
 
   /* "message" property (SARIF v2.1.0 section 3.27.11).  */
@@ -2060,7 +2060,7 @@ sarif_builder::make_result_object (const diagnostic_info 
&diagnostic,
                         diagnostic_artifact_role::result_file));
 
   /* "codeFlows" property (SARIF v2.1.0 section 3.27.18).  */
-  if (const paths::path *path = diagnostic.richloc->get_path ())
+  if (const paths::path *path = diagnostic.m_richloc->get_path ())
     {
       auto code_flows_arr = std::make_unique<json::array> ();
       const unsigned code_flow_index = 0;
@@ -2072,8 +2072,8 @@ sarif_builder::make_result_object (const diagnostic_info 
&diagnostic,
     }
 
   // "graphs" property (SARIF v2.1.0 section 3.27.19).  */
-  if (diagnostic.metadata)
-    if (auto ldg = diagnostic.metadata->get_lazy_digraphs ())
+  if (diagnostic.m_metadata)
+    if (auto ldg = diagnostic.m_metadata->get_lazy_digraphs ())
       {
        auto &digraphs = ldg->get_or_create_digraphs ();
        auto graphs_arr = std::make_unique<json::array> ();
@@ -2089,7 +2089,7 @@ sarif_builder::make_result_object (const diagnostic_info 
&diagnostic,
      group.  */
 
   /* "fixes" property (SARIF v2.1.0 section 3.27.30).  */
-  const rich_location *richloc = diagnostic.richloc;
+  const rich_location *richloc = diagnostic.m_richloc;
   if (richloc->get_num_fixit_hints ())
     {
       auto fix_arr = std::make_unique<json::array> ();
@@ -2118,7 +2118,7 @@ make_reporting_descriptor_object_for_warning (const 
diagnostic_info &diagnostic,
      it seems redundant compared to "id".  */
 
   /* "helpUri" property (SARIF v2.1.0 section 3.49.12).  */
-  if (char *option_url = m_context.make_option_url (diagnostic.option_id))
+  if (char *option_url = m_context.make_option_url (diagnostic.m_option_id))
     {
       reporting_desc->set_string ("helpUri", option_url);
       free (option_url);
@@ -2211,7 +2211,7 @@ sarif_builder::make_locations_arr (sarif_location_manager 
&loc_mgr,
     logical_loc = client_data_hooks->get_current_logical_location ();
 
   auto location_obj
-    = make_location_object (&loc_mgr, *diagnostic.richloc, logical_loc, role);
+    = make_location_object (&loc_mgr, *diagnostic.m_richloc, logical_loc, 
role);
   /* Don't add entirely empty location objects to the array.  */
   if (!location_obj->is_empty ())
     locations_arr->append<sarif_location> (std::move (location_obj));
diff --git a/gcc/diagnostics/text-sink.cc b/gcc/diagnostics/text-sink.cc
index 67da98cec0d8..e3206dfb7050 100644
--- a/gcc/diagnostics/text-sink.cc
+++ b/gcc/diagnostics/text-sink.cc
@@ -277,7 +277,7 @@ void
 text_sink::
 after_diagnostic (const diagnostic_info &diagnostic)
 {
-  if (const paths::path *path = diagnostic.richloc->get_path ())
+  if (const paths::path *path = diagnostic.m_richloc->get_path ())
     print_path (*path);
 }
 
@@ -291,13 +291,13 @@ after_diagnostic (const diagnostic_info &diagnostic)
 char *
 text_sink::build_prefix (const diagnostic_info &diagnostic) const
 {
-  gcc_assert (diagnostic.kind < DK_LAST_DIAGNOSTIC_KIND);
+  gcc_assert (diagnostic.m_kind < DK_LAST_DIAGNOSTIC_KIND);
 
-  const char *text = _(get_diagnostic_kind_text (diagnostic.kind));
+  const char *text = _(get_diagnostic_kind_text (diagnostic.m_kind));
   const char *text_cs = "", *text_ce = "";
   pretty_printer *pp = get_printer ();
 
-  if (const char *color_name = diagnostic_get_color_for_kind (diagnostic.kind))
+  if (const char *color_name = diagnostic_get_color_for_kind 
(diagnostic.m_kind))
     {
       text_cs = colorize_start (pp_show_color (pp), color_name);
       text_ce = colorize_stop (pp_show_color (pp));
@@ -310,7 +310,7 @@ text_sink::build_prefix (const diagnostic_info &diagnostic) 
const
 
       /* Reduce verbosity of nested diagnostics by not printing "note: "
         all the time.  */
-      if (diagnostic.kind == DK_NOTE)
+      if (diagnostic.m_kind == DK_NOTE)
        return indent_prefix;
 
       char *result = build_message_string ("%s%s%s%s", indent_prefix,
@@ -425,7 +425,7 @@ text_sink::append_note (location_t location,
   pretty_printer *pp = get_printer ();
   char *saved_prefix = pp_take_prefix (pp);
   pp_set_prefix (pp, build_prefix (diagnostic));
-  pp_format (pp, &diagnostic.message);
+  pp_format (pp, &diagnostic.m_message);
   pp_output_formatted_text (pp);
   pp_destroy_prefix (pp);
   pp_set_prefix (pp, saved_prefix);
@@ -469,16 +469,16 @@ text_sink::update_printer ()
 void
 text_sink::print_any_cwe (const diagnostic_info &diagnostic)
 {
-  if (!diagnostic.metadata)
+  if (!diagnostic.m_metadata)
     return;
 
-  int cwe = diagnostic.metadata->get_cwe ();
+  int cwe = diagnostic.m_metadata->get_cwe ();
   if (cwe)
     {
       pretty_printer * const pp = get_printer ();
       char *saved_prefix = pp_take_prefix (pp);
       pp_string (pp, " [");
-      const char *kind_color = diagnostic_get_color_for_kind (diagnostic.kind);
+      const char *kind_color = diagnostic_get_color_for_kind 
(diagnostic.m_kind);
       pp_string (pp, colorize_start (pp_show_color (pp), kind_color));
       if (pp->supports_urls_p ())
        {
@@ -504,20 +504,20 @@ text_sink::print_any_cwe (const diagnostic_info 
&diagnostic)
 void
 text_sink::print_any_rules (const diagnostic_info &diagnostic)
 {
-  if (!diagnostic.metadata)
+  if (!diagnostic.m_metadata)
     return;
 
-  for (unsigned idx = 0; idx < diagnostic.metadata->get_num_rules (); idx++)
+  for (unsigned idx = 0; idx < diagnostic.m_metadata->get_num_rules (); idx++)
     {
       const diagnostics::metadata::rule &rule
-       = diagnostic.metadata->get_rule (idx);
+       = diagnostic.m_metadata->get_rule (idx);
       if (char *desc = rule.make_description ())
        {
          pretty_printer * const pp = get_printer ();
          char *saved_prefix = pp_take_prefix (pp);
          pp_string (pp, " [");
          const char *kind_color
-           = diagnostic_get_color_for_kind (diagnostic.kind);
+           = diagnostic_get_color_for_kind (diagnostic.m_kind);
          pp_string (pp, colorize_start (pp_show_color (pp), kind_color));
          char *url = nullptr;
          if (pp->supports_urls_p ())
@@ -548,15 +548,15 @@ text_sink::print_option_information (const 
diagnostic_info &diagnostic,
                                     diagnostic_t orig_diag_kind)
 {
   if (char *option_text
-      = m_context.make_option_name (diagnostic.option_id,
-                                   orig_diag_kind, diagnostic.kind))
+      = m_context.make_option_name (diagnostic.m_option_id,
+                                   orig_diag_kind, diagnostic.m_kind))
     {
       char *option_url = nullptr;
       pretty_printer * const pp = get_printer ();
       if (pp->supports_urls_p ())
-       option_url = m_context.make_option_url (diagnostic.option_id);
+       option_url = m_context.make_option_url (diagnostic.m_option_id);
       pp_string (pp, " [");
-      const char *kind_color = diagnostic_get_color_for_kind (diagnostic.kind);
+      const char *kind_color = diagnostic_get_color_for_kind 
(diagnostic.m_kind);
       pp_string (pp, colorize_start (pp_show_color (pp), kind_color));
       if (option_url)
        pp_begin_url (pp, option_url);
@@ -718,7 +718,7 @@ default_text_finalizer (text_sink &text_output,
   pp_newline (pp);
   diagnostic_show_locus (&text_output.get_context (),
                         text_output.get_source_printing_options (),
-                        diagnostic->richloc, diagnostic->kind, pp);
+                        diagnostic->m_richloc, diagnostic->m_kind, pp);
   pp_set_prefix (pp, saved_prefix);
   pp_flush (pp);
 }
diff --git a/gcc/fortran/error.cc b/gcc/fortran/error.cc
index 98c67fd952ff..a088d761adff 100644
--- a/gcc/fortran/error.cc
+++ b/gcc/fortran/error.cc
@@ -273,7 +273,7 @@ gfc_warning (int opt, const char *gmsgid, va_list ap)
 
   diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc,
                       DK_WARNING);
-  diagnostic.option_id = opt;
+  diagnostic.m_option_id = opt;
   bool ret = gfc_report_diagnostic (&diagnostic);
 
   if (buffered_p)
@@ -441,7 +441,7 @@ gfc_format_decoder (pretty_printer *pp, text_info *text, 
const char *spec,
        const char *color
          = (loc_num
             ? "range1"
-            : diagnostic_get_color_for_kind (curr_diagnostic->kind));
+            : diagnostic_get_color_for_kind (curr_diagnostic->m_kind));
        pp_string (pp, colorize_start (pp_show_color (pp), color));
        pp_string (pp, result[loc_num]);
        pp_string (pp, colorize_stop (pp_show_color (pp)));
@@ -475,15 +475,15 @@ gfc_diagnostic_build_kind_prefix (diagnostic_context 
*context,
 #undef DEFINE_DIAGNOSTIC_KIND
     NULL
   };
-  gcc_assert (diagnostic->kind < DK_LAST_DIAGNOSTIC_KIND);
-  const char *text = _(diagnostic_kind_text[diagnostic->kind]);
+  gcc_assert (diagnostic->m_kind < DK_LAST_DIAGNOSTIC_KIND);
+  const char *text = _(diagnostic_kind_text[diagnostic->m_kind]);
   const char *text_cs = "", *text_ce = "";
   pretty_printer *const pp = context->get_reference_printer ();
 
-  if (diagnostic_kind_color[diagnostic->kind])
+  if (diagnostic_kind_color[diagnostic->m_kind])
     {
       text_cs = colorize_start (pp_show_color (pp),
-                               diagnostic_kind_color[diagnostic->kind]);
+                               diagnostic_kind_color[diagnostic->m_kind]);
       text_ce = colorize_stop (pp_show_color (pp));
     }
   return build_message_string ("%s%s:%s ", text_cs, text, text_ce);
@@ -557,7 +557,7 @@ gfc_diagnostic_text_starter (diagnostics::text_sink 
&text_output,
 
   expanded_location s1 = diagnostic_expand_location (diagnostic);
   expanded_location s2;
-  bool one_locus = diagnostic->richloc->get_num_locations () < 2;
+  bool one_locus = diagnostic->m_richloc->get_num_locations () < 2;
   bool same_locus = false;
 
   if (!one_locus)
@@ -608,7 +608,7 @@ gfc_diagnostic_text_starter (diagnostics::text_sink 
&text_output,
       pp_newline (pp);
       diagnostic_show_locus (context,
                             text_output.get_source_printing_options (),
-                            diagnostic->richloc, diagnostic->kind,
+                            diagnostic->m_richloc, diagnostic->m_kind,
                             pp);
       /* If the caret line was shown, the prefix does not contain the
         locus.  */
@@ -656,7 +656,7 @@ gfc_warning_now_at (location_t loc, int opt, const char 
*gmsgid, ...)
 
   va_start (argp, gmsgid);
   diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc, DK_WARNING);
-  diagnostic.option_id = opt;
+  diagnostic.m_option_id = opt;
   ret = gfc_report_diagnostic (&diagnostic);
   va_end (argp);
   return ret;
@@ -675,7 +675,7 @@ gfc_warning_now (int opt, const char *gmsgid, ...)
   va_start (argp, gmsgid);
   diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc,
                       DK_WARNING);
-  diagnostic.option_id = opt;
+  diagnostic.m_option_id = opt;
   ret = gfc_report_diagnostic (&diagnostic);
   va_end (argp);
   return ret;
@@ -694,7 +694,7 @@ gfc_warning_internal (int opt, const char *gmsgid, ...)
   va_start (argp, gmsgid);
   diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc,
                       DK_WARNING);
-  diagnostic.option_id = opt;
+  diagnostic.m_option_id = opt;
   ret = gfc_report_diagnostic (&diagnostic);
   va_end (argp);
   return ret;
diff --git a/gcc/libgdiagnostics.cc b/gcc/libgdiagnostics.cc
index 67420c700b6b..a55151dd232a 100644
--- a/gcc/libgdiagnostics.cc
+++ b/gcc/libgdiagnostics.cc
@@ -1446,8 +1446,8 @@ void
 diagnostic_text_sink::text_starter (diagnostics::text_sink &text_output,
                                    const diagnostic_info *info)
 {
-  gcc_assert (info->x_data);
-  const diagnostic &diag = *static_cast<const diagnostic *> (info->x_data);
+  gcc_assert (info->m_x_data);
+  const diagnostic &diag = *static_cast<const diagnostic *> (info->m_x_data);
   pretty_printer *pp = text_output.get_printer ();
   const diagnostic_logical_location *diag_logical_loc
     = diag.get_logical_location ();
@@ -1617,8 +1617,8 @@ GCC_DIAGNOSTIC_PUSH_IGNORED(-Wsuggest-attribute=format)
     diagnostic_set_info (&info, msgid, args, diag.get_rich_location (),
                         diagnostic_t_from_diagnostic_level (diag.get_level 
()));
 GCC_DIAGNOSTIC_POP
-    info.metadata = diag.get_metadata ();
-    info.x_data = &diag;
+    info.m_metadata = diag.get_metadata ();
+    info.m_x_data = &diag;
     diagnostic_report_diagnostic (&m_dc, &info);
 
     m_dc.end_group ();
diff --git a/gcc/substring-locations.cc b/gcc/substring-locations.cc
index 78ce72268754..990a8bd79fe1 100644
--- a/gcc/substring-locations.cc
+++ b/gcc/substring-locations.cc
@@ -223,7 +223,7 @@ format_string_diagnostic_t::emit_warning_n_va 
(diagnostic_option_id option_id,
   else
     diagnostic_set_info (&diagnostic, singular_gmsgid, ap, &richloc,
                         DK_WARNING);
-  diagnostic.option_id = option_id;
+  diagnostic.m_option_id = option_id;
   bool warned = diagnostic_report_diagnostic (global_dc, &diagnostic);
 
   if (!err && fmt_substring_loc && !substring_within_range)
diff --git a/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.cc 
b/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.cc
index 4d2057c5e602..d22e73a730a9 100644
--- a/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.cc
+++ b/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.cc
@@ -143,7 +143,7 @@ custom_diagnostic_text_finalizer (diagnostics::text_sink 
&text_output,
   pp_newline (pp);
   diagnostic_show_locus (&text_output.get_context (),
                         text_output.get_source_printing_options (),
-                        diagnostic->richloc, diagnostic->kind, pp);
+                        diagnostic->m_richloc, diagnostic->m_kind, pp);
   pp_show_color (pp) = old_show_color;
   pp_set_prefix (pp, saved_prefix);
   pp_flush (pp);
diff --git a/gcc/tree-diagnostic.cc b/gcc/tree-diagnostic.cc
index 3f706ac04f00..b2435df46b32 100644
--- a/gcc/tree-diagnostic.cc
+++ b/gcc/tree-diagnostic.cc
@@ -169,7 +169,7 @@ set_inlining_locations (diagnostic_context *,
   /* Set if all locations are in a system header.  */
   diagnostic->m_iinfo.m_allsyslocs = nsyslocs == ilocs.length ();
 
-  if (tree *ao = pp_ti_abstract_origin (&diagnostic->message))
+  if (tree *ao = pp_ti_abstract_origin (&diagnostic->m_message))
     *ao = (tree)diagnostic->m_iinfo.m_ao;
 }
 
-- 
2.26.3

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