configure.in: define GC_DLL under mingw if --enable-shared

2003-04-28  Mohan Embar  <gnustuff@thisiscool.com>

	* configure.in: define GC_DLL under mingw if --enable-shared
	* configure: rebuilt
	* win32_threads.c: add #ifdef GC_DLL around DllMain

From-SVN: r66183

boehm-gc/ChangeLog

+2003-04-28  Mohan Embar  <gnustuff@thisiscool.com>
+
+	* configure.in: define GC_DLL under mingw if --enable-shared
+	* configure: rebuilt
+	* win32_threads.c: add #ifdef GC_DLL around DllMain
+
 2003-04-16  Richard Earnshaw  <rearnsha@arm.com>
 
 	* include/private/gcconfig.h: Add support for arm-netbsdelf.

boehm-gc/configure.in

@@ -116,6 +116,9 @@ case "$THREADS" in
  win32)
     AC_DEFINE(GC_WIN32_THREADS)
     AC_DEFINE(NO_GETENV)
+    if test $enable_shared = yes; then
+      AC_DEFINE(GC_DLL)
+    fi
     ;;
  decosf1 | irix | mach | os2 | solaris | dce | vxworks)
     AC_MSG_ERROR(thread package $THREADS not yet supported)

boehm-gc/win32_threads.c

@@ -527,6 +527,8 @@ DWORD WINAPI main_thread_start(LPVOID arg)
 
 LONG WINAPI GC_write_fault_handler(struct _EXCEPTION_POINTERS *exc_info);
 
+#ifdef GC_DLL
+
 /*
  * This isn't generally safe, since DllMain is not premptible.
  * If another thread holds the lock while this runs we're in trouble.
@@ -635,6 +637,8 @@ BOOL WINAPI DllMain(HINSTANCE inst, ULONG reason, LPVOID reserved)
   return TRUE;
 }
 
+#   endif /* GC_DLL */
+
 # endif /* !MSWINCE */
 
 #endif /* GC_WIN32_THREADS */