[PATCH 7/7] widl: Fix C++ RuntimeClass string constant declaration.

[Rémi Bernon]

MinGW g++ requires initialized selectany to have extern linkage. We also
defines WCHAR as char16_t, so it cannot be initialized from L"" strings.

Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
---
 tools/widl/header.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/widl/header.c b/tools/widl/header.c
index b8fe3c1c445..bff51815fcd 100644
--- a/tools/widl/header.c
+++ b/tools/widl/header.c
@@ -1890,8 +1890,12 @@ static void write_runtimeclass(FILE *header, type_t *runtimeclass)
     fprintf(header, "#ifndef RUNTIMECLASS_%s_DEFINED\n", c_name);
     fprintf(header, "#define RUNTIMECLASS_%s_DEFINED\n", c_name);
     fprintf(header, "#if defined(_MSC_VER) || defined(__MINGW32__)\n");
+    fprintf(header, "#ifdef __cplusplus\n");
+    fprintf(header, "extern const DECLSPEC_SELECTANY wchar_t RuntimeClass_%s[] = L\"%s\";\n", c_name, name);
+    fprintf(header, "#else\n");
     /* FIXME: MIDL generates extern const here but GCC warns if extern is initialized */
     fprintf(header, "const DECLSPEC_SELECTANY WCHAR RuntimeClass_%s[] = L\"%s\";\n", c_name, name);
+    fprintf(header, "#endif\n");
     fprintf(header, "#else\n");
     fprintf(header, "static const WCHAR RuntimeClass_%s[] = {", c_name);
     for (i = 0, len = strlen(name); i < len; ++i) fprintf(header, "'%c',", name[i]);
-- 
2.30.0