pathplan: add storage-class attribute declarations in tri.h

This will allow removing the tri.h symbols from the pathplan.def file in an
upcoming commit.

Towards https://gitlab.com/graphviz/graphviz/-/issues/2058.

diff --git a/lib/pathplan/tri.h b/lib/pathplan/tri.h
index b69e7a27c70e568a7682639695faf1809f25a1e2..2747237242e9059a17a95d0df866c828859b7baa 100644 (file)
--- a/lib/pathplan/tri.h
+++ b/lib/pathplan/tri.h
@@ -15,11 +15,25 @@ extern "C" {
 
 #include <pathgeom.h>
 
+#ifdef GVDLL
+#ifdef PATHPLAN_EXPORTS
+#define TRI_API __declspec(dllexport)
+#else
+#define TRI_API __declspec(dllimport)
+#endif
+#endif
+
+#ifndef TRI_API
+#define TRI_API /* nothing */
+#endif
+
 /* Points in polygon must be in CCW order */
-    int Ptriangulate(Ppoly_t * polygon,
+    TRI_API int Ptriangulate(Ppoly_t * polygon,
                      void (*fn) (void *closure, Ppoint_t tri[]),
                      void *vc);
 
+#undef TRI_API
+
 #ifdef __cplusplus
 }
 #endif