refs #282 changes to get xbus to compile on Linux

src/xbus/xbus.map

@@ -0,0 +1,10 @@
+{
+ global:
+  XPluginStart;
+  XPluginStop;
+  XPluginEnable;
+  XPluginDisable;
+  XPluginReceiveMessage;
+ local:
+   *;
+};

src/xbus/xbus.pro

@@ -5,13 +5,17 @@ QT       += core gui widgets dbus network
 
 TEMPLATE = lib
 
-CONFIG += shared
+CONFIG += shared plugin
 CONFIG += blackmisc blackcore
 
 win32 {
     equals(WORD_SIZE,64): LIBS += -lXPLM_64
     equals(WORD_SIZE,32): LIBS += -lXPLM
 }
+unix {
+    # Flags needed because there is no XPLM link library
+    QMAKE_LFLAGS += -shared -rdynamic -nodefaultlibs -undefined_warning -Wl,--version-script=$$PWD/xbus.map
+}
 
 DEPENDPATH += . ../../src
 INCLUDEPATH += . ../../src
@@ -65,13 +69,17 @@ linux:TARGET = lin
 macx:TARGET = mac
 macx {
     # a single dylib file contains both 32bit and 64bit binaries
-    DESTDIR = ../../xbus
+    XBUS_DESTDIR = ../../xbus
 }
 else {
-    equals(WORD_SIZE,64): DESTDIR = ../../xbus/64
-    equals(WORD_SIZE,32): DESTDIR = ../../xbus
+    equals(WORD_SIZE,64): XBUS_DESTDIR = ../../xbus/64
+    equals(WORD_SIZE,32): XBUS_DESTDIR = ../../xbus
 }
 
+# QMake's Makefile generator ignores TARGET_EXT
+unix: QMAKE_POST_LINK += cp $$DESTDIR/lib$${TARGET}.so $$XBUS_DESTDIR/$${TARGET}.xpl
+else: DESTDIR = $$XBUS_DESTDIR
+
 include (../../libraries.pri)
 
 # TODO refactor .pri files into common_pre.pri and common_post.pri