fix(raykx): use __declspec(dllexport) instead of .def file on Windows

MinGW lld doesn't understand MSVC-style /DEF: options. Use standard
dllexport attribute which works with all Windows toolchains.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: singaraiona

ext/raykx/Makefile

@@ -12,7 +12,7 @@ CFLAGS = -Wall -Wextra -std=c17 -fsigned-char -m64 -I. -I../../core
 
 ifneq (,$(IS_WINDOWS))
     TARGET = raykx.dll
-    # On Windows, link against rayforce.lib import library
+    # On Windows, exports via __declspec(dllexport) in raykx.h
     TEMP ?= /tmp
     export TEMP
     LDFLAGS = -shared -fuse-ld=lld
@@ -36,18 +36,10 @@ endif
 default: debug
 
 debug:
-ifneq (,$(IS_WINDOWS))
-	$(CC) -include ../../core/def.h $(DEBUG_CFLAGS) $(LDFLAGS) -Wl,/DEF:$(shell cygpath -w raykx.def) -o $(TARGET) $(SRCS) $(LIBS)
-else
 	$(CC) -include ../../core/def.h $(DEBUG_CFLAGS) $(LDFLAGS) -o $(TARGET) $(SRCS) $(LIBS)
-endif
 
 release:
-ifneq (,$(IS_WINDOWS))
-	$(CC) -include ../../core/def.h $(RELEASE_CFLAGS) $(LDFLAGS) -Wl,/DEF:$(shell cygpath -w raykx.def) -o $(TARGET) $(SRCS) $(LIBS)
-else
 	$(CC) -include ../../core/def.h $(RELEASE_CFLAGS) $(LDFLAGS) -o $(TARGET) $(SRCS) $(LIBS)
-endif
 
 clean:
 	rm -f $(TARGET) libraykx.so libraykx.dylib raykx.dll

ext/raykx/raykx.h

@@ -26,6 +26,12 @@
 
 #include "../../core/rayforce.h"
 
+#ifdef _WIN32
+#define RAYKX_EXPORT __declspec(dllexport)
+#else
+#define RAYKX_EXPORT
+#endif
+
 // KDB+ IPC Protocol Constants
 #define KDB_MSG_ASYN 0
 #define KDB_MSG_SYNC 1
@@ -48,8 +54,9 @@ typedef struct raykx_header_t {
     u32_t size;
 } *raykx_header_p;
 
-obj_p raykx_hopen(obj_p addr);
-obj_p raykx_hclose(obj_p fd);
-obj_p raykx_send(obj_p fd, obj_p msg);
+RAYKX_EXPORT obj_p raykx_listen(obj_p x);
+RAYKX_EXPORT obj_p raykx_hopen(obj_p addr);
+RAYKX_EXPORT obj_p raykx_hclose(obj_p fd);
+RAYKX_EXPORT obj_p raykx_send(obj_p fd, obj_p msg);
 
 #endif  // RAYKX_H