[PATCH 1/5] widl: Do not generate C++ enum typedefs in WinRT mode.

[Rémi Bernon]

MIDL generates enum typedefs without a prior type declaration, as well
as using explicit enum underlying type specifier. None of this is
supported in MinGW.

Signed-off-by: Rémi Bernon 
---

AFAIK the patch has been requested and used by MinGW users to fix their
WinRT generated headers with C++ code.

This does the following kind of changes to the headers:
> diff --git a/windows.devices.enumeration.h b/windows.devices.enumeration.h
> index fc7e8c4..981c5c3 100644
> --- a/windows.devices.enumeration.h
> +++ b/windows.devices.enumeration.h
> @@ -248,31 +248,11 @@ typedef interface __FITypedEventHandler_2_Windows__CDevices__CEnumeration__CDevi
>  extern "C" {
>  #endif
>
> -#ifdef __cplusplus
> -namespace ABI {
> - namespace Windows {
> -
>    namespace Devices {
> -
>        namespace Enumeration {
> -
>            typedef enum DeviceWatcherStatus DeviceWatcherStatus;
> -
>        }
> -
>    }
> - }
>
> -}
> -#else /* __cplusplus */
> +#ifndef __cplusplus
>  typedef enum __x_ABI_CWindows_CDevices_CEnumeration_CDeviceWatcherStatus __x_ABI_CWindows_CDevices_CEnumeration_CDeviceWatcherStatus
>  #endif /* __cplusplus */
>
> -#ifdef __cplusplus
> -namespace ABI {
> - namespace Windows {
> -
>    namespace Devices {
> -
>        namespace Enumeration {
> -
>            typedef enum Panel Panel;
> -
>        }
> -
>    }
> - }
>
> -}
> -#else /* __cplusplus */
> +#ifndef __cplusplus
>  typedef enum __x_ABI_CWindows_CDevices_CEnumeration_CPanel __x_ABI_CWindows_CDevices_CEnumeration_CPanel;
>  #endif /* __cplusplus */

tools/widl/header.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/tools/widl/header.c b/tools/widl/header.c
index f8dcab91e6a..4a59cb9162a 100644
--- a/tools/widl/header.c
+++ b/tools/widl/header.c
@@ -872,22 +872,28 @@ static void write_typedef(FILE *header, type_t *type, int declonly)
     type_t *t = type_alias_get_aliasee_type(type);
     if (winrt_mode && t->namespace && !is_global_namespace(t->namespace))
     {
-        fprintf(header, "#ifdef __cplusplus\n");
-        write_namespace_start(header, t->namespace);
-        indent(header, 0);
-    }
-    fprintf(header, "typedef ");
-    write_type_v(header, type_alias_get_aliasee(type), FALSE, declonly, type->name, NAME_DEFAULT);
-    fprintf(header, ";\n");
-    if (winrt_mode && t->namespace && !is_global_namespace(t->namespace))
-    {
-        write_namespace_end(header, t->namespace);
-        fprintf(header, "#else /* __cplusplus */\n");
+        fprintf(header, "#ifndef __cplusplus\n");
         fprintf(header, "typedef ");
         write_type_v(header, type_alias_get_aliasee(type), FALSE, declonly, type->c_name, NAME_C);
         fprintf(header, ";\n");
+        if (type_get_type_detect_alias(t) != TYPE_ENUM)
+        {
+            fprintf(header, "#else /* __cplusplus */\n");
+            write_namespace_start(header, t->namespace);
+            indent(header, 0);
+            fprintf(header, "typedef ");
+            write_type_v(header, type_alias_get_aliasee(type), FALSE, declonly, type->name, NAME_DEFAULT);
+            fprintf(header, ";\n");
+            write_namespace_end(header, t->namespace);
+        }
         fprintf(header, "#endif /* __cplusplus */\n\n");
     }
+    else
+    {
+        fprintf(header, "typedef ");
+        write_type_v(header, type_alias_get_aliasee(type), FALSE, declonly, type->name, NAME_DEFAULT);
+        fprintf(header, ";\n");
+    }
 }

int is_const_decl(const var_t *var)