[PATCH v2] widl: Support midl_pragma default option

[Andrew Boyarshin]

This should essentially be "reset to default behavior" for specified
warnings, which is what "enabling" does in WIDL.
Increases IDL file format compatibility.

Signed-off-by: Andrew Boyarshin <andrew.boyarshin at gmail.com>
---
 tools/widl/parser.h | 2 +-
 tools/widl/parser.l | 4 ++--
 tools/widl/parser.y | 8 ++++++++
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/widl/parser.h b/tools/widl/parser.h
index a67b160d48aa..bc0c50792e19 100644
--- a/tools/widl/parser.h
+++ b/tools/widl/parser.h
@@ -39,7 +39,7 @@ void pop_import(void);
 
 int is_type(const char *name);
 
-int do_warning(char *toggle, warning_list_t *wnum);
+int do_warning(const char *toggle, warning_list_t *wnum);
 int is_warning_enabled(int warning);
 
 extern char *temp_name;
diff --git a/tools/widl/parser.l b/tools/widl/parser.l
index 946dba84cd65..3e34bc411739 100644
--- a/tools/widl/parser.l
+++ b/tools/widl/parser.l
@@ -645,7 +645,7 @@ static void warning_enable(int warning)
         }
 }
 
-int do_warning(char *toggle, warning_list_t *wnum)
+int do_warning(const char *toggle, warning_list_t *wnum)
 {
     warning_t *warning, *next;
     int ret = 1;
@@ -658,7 +658,7 @@ int do_warning(char *toggle, warning_list_t *wnum)
     if(!strcmp(toggle, "disable"))
         LIST_FOR_EACH_ENTRY(warning, wnum, warning_t, entry)
             warning_disable(warning->num);
-    else if(!strcmp(toggle, "enable"))
+    else if(!strcmp(toggle, "enable") || !strcmp(toggle, "default"))
         LIST_FOR_EACH_ENTRY(warning, wnum, warning_t, entry)
             warning_enable(warning->num);
     else
diff --git a/tools/widl/parser.y b/tools/widl/parser.y
index a6128074f2d5..b419f540108c 100644
--- a/tools/widl/parser.y
+++ b/tools/widl/parser.y
@@ -426,6 +426,14 @@ pragma_warning: tPRAGMA_WARNING '(' aIDENTIFIER ':' warnings ')'
                       if(!result)
                           error_loc("expected \"disable\" or \"enable\"\n");
                   }
+              | tPRAGMA_WARNING '(' tDEFAULT ':' warnings ')'
+                  {
+                      int result;
+                      $$ = NULL;
+                      result = do_warning("default", $5);
+                      if(!result)
+                          error_loc("expected \"default\"\n");
+                  }
 	;
 
 warnings:
-- 
2.30.0.windows.1