From b1d8671bd43fd58e99aa341c0242edddf60971a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Wed, 19 Feb 2014 11:51:50 +0200
Subject: [PATCH] Support building DLLs with MSVC

MSVC doesn't export any functions at all by default, contrary to
gcc which exports all global functions by default.

Doing the same for linux/OS X isn't too hard, but they use yet
two other, different syntaxes for the corresponding symbol file.
---
 Makefile                      | 2 +-
 build/platform-msvc-common.mk | 3 +++
 wels.def                      | 5 +++++
 3 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 wels.def

diff --git a/Makefile b/Makefile
index 5b7dfce4..3c2ffb5c 100644
--- a/Makefile
+++ b/Makefile
@@ -123,7 +123,7 @@ $(LIBPREFIX)wels.$(LIBSUFFIX): $(ENCODER_OBJS) $(DECODER_OBJS) $(PROCESSING_OBJS
 
 $(LIBPREFIX)wels.$(SHAREDLIBSUFFIX): $(ENCODER_OBJS) $(DECODER_OBJS) $(PROCESSING_OBJS) $(COMMON_OBJS)
 	$(QUIET)rm -f $@
-	$(QUIET_CXX)$(CXX) $(SHARED) $(LDFLAGS) $(CXX_LINK_O) $+
+	$(QUIET_CXX)$(CXX) $(SHARED) $(LDFLAGS) $(CXX_LINK_O) $+ $(SHLDFLAGS)
 
 install: $(LIBPREFIX)wels.$(LIBSUFFIX) $(LIBPREFIX)wels.$(SHAREDLIBSUFFIX)
 	mkdir -p $(PREFIX)/lib
diff --git a/build/platform-msvc-common.mk b/build/platform-msvc-common.mk
index 3c89ba74..13a57998 100644
--- a/build/platform-msvc-common.mk
+++ b/build/platform-msvc-common.mk
@@ -13,3 +13,6 @@ LINK_LIB=$(1).lib
 LIBSUFFIX=lib
 LIBPREFIX=
 EXEEXT=.exe
+SHAREDLIBSUFFIX=dll
+SHARED=-LD
+SHLDFLAGS=-link -def:wels.def -implib:wels_dll.lib
diff --git a/wels.def b/wels.def
new file mode 100644
index 00000000..281246f0
--- /dev/null
+++ b/wels.def
@@ -0,0 +1,5 @@
+EXPORTS
+	CreateDecoder
+	DestroyDecoder
+	CreateSVCEncoder
+	DestroySVCEncoder