From a1d8935b2b2449e07767f0bd42a54aaa755f0f67 Mon Sep 17 00:00:00 2001
From: LoRd_MuldeR <mulder2@gmx.de>
Date: Sat, 3 Dec 2022 02:21:53 +0100
Subject: [PATCH] Added DllMain() function to Windows "shared" library (DLL).

---
 config.mk                             |  2 +-
 libhashset/Makefile                   |  6 +++---
 libhashset/libhashset.vcxproj         |  1 +
 libhashset/libhashset.vcxproj.filters |  3 +++
 libhashset/src/dll_main.c             | 29 +++++++++++++++++++++++++++
 5 files changed, 37 insertions(+), 4 deletions(-)
 create mode 100644 libhashset/src/dll_main.c

diff --git a/config.mk b/config.mk
index f16d87e..3b7bf53 100644
--- a/config.mk
+++ b/config.mk
@@ -24,7 +24,7 @@ endif
 endif
 
 ifeq ($(firstword $(filter %-mingw32 %-cygwin,$(DUMPMACHINE))),)
-  DLL_LDFLAGS = -fPIC -shared
+  DLL_LDFLAGS = -shared
   DLL_SUFFIX := .so
 else
   DLL_LDFLAGS = -shared -Wl,--out-implib,$@.a
diff --git a/libhashset/Makefile b/libhashset/Makefile
index 6106539..6f20115 100644
--- a/libhashset/Makefile
+++ b/libhashset/Makefile
@@ -1,6 +1,6 @@
 include ../config.mk
 
-CFLAGS = -std=c99 -D_DEFAULT_SOURCE -Wpedantic -Iinclude $(XCFLAGS)
+CFLAGS = -std=c99 -D_DEFAULT_SOURCE -Wpedantic -Iinclude -fPIC $(XCFLAGS)
 
 SRC_PATH := src
 OBJ_PATH := obj
@@ -21,9 +21,9 @@ test: build
 build: $(ALL_PATH) $(LIB_FILE) $(DLL_FILE)
 
 $(LIB_FILE): $(OBJ_FILE)
-	$(AR) rcs $@ $^
+	$(AR) rcs $@ $(filter-out $(OBJ_PATH)/dll%,$^)
 
-$(DLL_FILE): $(SRC_FILE)
+$(DLL_FILE): $(OBJ_FILE)
 	$(CC) $(CFLAGS) $(DLL_LDFLAGS) -o $@ $^
 
 $(OBJ_FILE):
diff --git a/libhashset/libhashset.vcxproj b/libhashset/libhashset.vcxproj
index 189fdfc..f49a5c4 100644
--- a/libhashset/libhashset.vcxproj
+++ b/libhashset/libhashset.vcxproj
@@ -46,6 +46,7 @@
     <ClInclude Include="src\generic_hash_set.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="src\dll_main.c" />
     <ClCompile Include="src\hash_map_16.c" />
     <ClCompile Include="src\hash_map_32.c" />
     <ClCompile Include="src\hash_map_64.c" />
diff --git a/libhashset/libhashset.vcxproj.filters b/libhashset/libhashset.vcxproj.filters
index 1be189e..335644b 100644
--- a/libhashset/libhashset.vcxproj.filters
+++ b/libhashset/libhashset.vcxproj.filters
@@ -53,5 +53,8 @@
     <ClCompile Include="src\hash_set_16.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\dll_main.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/libhashset/src/dll_main.c b/libhashset/src/dll_main.c
new file mode 100644
index 0000000..7fa6475
--- /dev/null
+++ b/libhashset/src/dll_main.c
@@ -0,0 +1,29 @@
+/******************************************************************************/
+/* HashSet for C99, by LoRd_MuldeR <MuldeR2@GMX.de>                           */
+/* This work has been released under the CC0 1.0 Universal license!           */
+/******************************************************************************/
+
+#if defined(_WIN32)
+
+#define WIN32_LEAN_AND_MEAN 1
+#include <Windows.h>
+
+BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
+{
+	switch (ul_reason_for_call)
+	{
+	case DLL_PROCESS_ATTACH:
+	case DLL_THREAD_ATTACH:
+	case DLL_THREAD_DETACH:
+	case DLL_PROCESS_DETACH:
+		break;
+	}
+	return TRUE;
+}
+
+#elif defined(__GNUC__)
+
+void __attribute__((constructor)) libhashet_init(void) { /*noop*/ }
+void __attribute__((destructor))  libhashet_exit(void) { /*noop*/ }
+
+#endif