a patch from Bjørnar Luteberget for compatibility with MSVC

1 files changed, 22 insertions, 2 deletions

diff --git a/src/runtime/c/pgf/literals.h b/src/runtime/c/pgf/literals.h
index 7de17b121..624d82f9f 100644
--- a/src/runtime/c/pgf/literals.h
+++ b/src/runtime/c/pgf/literals.h
@@ -1,13 +1,33 @@
 #ifndef PGF_LITERALS_H_
 #define PGF_LITERALS_H_
 
+// MSVC requires explicit export/import of
+// symbols in DLLs. CMake takes care of this
+// for functions, but not for data/variables.
+#if defined(_MSC_VER)
+#if defined(COMPILING_PGF)
+#define PGF_API_DATA_DECL __declspec(dllexport)
+#define PGF_API_DATA __declspec(dllexport)
+#else
+#define PGF_API_DATA_DECL __declspec(dllimport)
+#define PGF_API_DATA ERROR_NOT_COMPILING_LIBPGF
+#endif
+
+#else
+
+#define PGF_API_DATA_DECL extern
+#define PGF_API_DATA
+#endif
+// end MSVC workaround
+ 
+ 
 #include <pgf/data.h>
 
 // literal for named entities recognition
-extern PgfLiteralCallback pgf_nerc_literal_callback;
+PGF_API_DATA_DECL PgfLiteralCallback pgf_nerc_literal_callback;
 
 // literal for finding unknown words
-extern PgfLiteralCallback pgf_unknown_literal_callback;
+PGF_API_DATA_DECL PgfLiteralCallback pgf_unknown_literal_callback;
 
 PgfCCat*
 pgf_literal_cat(PgfConcr* concr, PgfLiteral lit);