Rémi Bernon : widl: Fix C++ RuntimeClass string constants declaration.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6966d7ea0821969ed4f2449fafd1197141e4bb62
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=6966d7ea0821969ed4f2449fa...

Author: Rémi Bernon <rbernon(a)codeweavers.com>
Date:   Fri Feb 26 15:36:42 2021 +0100

widl: Fix C++ RuntimeClass string constants declaration.

MinGW g++ requires initialized selectany to have extern linkage.

Also, because of the various ways WCHAR may be defined, using an array
initializer is the simplest way to support all cases.

Signed-off-by: Rémi Bernon <rbernon(a)codeweavers.com>
Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 tools/widl/header.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/widl/header.c b/tools/widl/header.c
index a472af49066..cb0dc2f43a3 100644
--- a/tools/widl/header.c
+++ b/tools/widl/header.c
@@ -1835,11 +1835,15 @@ static void write_runtimeclass(FILE *header, type_t *runtimeclass)
     if (contract) write_apicontract_guard_start(header, contract);
     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, "#if !defined(_MSC_VER) && !defined(__MINGW32__)\n");
+    fprintf(header, "static const WCHAR RuntimeClass_%s[] = {", c_name);
+    for (i = 0, len = strlen(name); i < len; ++i) fprintf(header, "'%c',", name[i]);
+    fprintf(header, "0};\n");
+    fprintf(header, "#elif defined(__GNUC__) && !defined(__cplusplus)\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, "#else\n");
-    fprintf(header, "static const WCHAR RuntimeClass_%s[] = {", c_name);
+    fprintf(header, "extern const DECLSPEC_SELECTANY WCHAR RuntimeClass_%s[] = {", c_name);
     for (i = 0, len = strlen(name); i < len; ++i) fprintf(header, "'%c',", name[i]);
     fprintf(header, "0};\n");
     fprintf(header, "#endif\n");