Avoid errors due to not having any files in "adv" library

Compile dummy.cpp as part of the library under Unix to avoid problems
with some versions of ar refusing to create empty static libraries.

Makefile.in

@@ -11,7 +11,6 @@ prefix = @prefix@
 exec_prefix = @exec_prefix@
 datarootdir = @datarootdir@
 INSTALL = @INSTALL@
-SHARED_LD_CC = @SHARED_LD_CC@
 SHARED_LD_CXX = @SHARED_LD_CXX@
 SHARED_LD_MODULE_CXX = @SHARED_LD_MODULE_CXX@
 LIBEXT = @LIBEXT@
@@ -1525,20 +1524,24 @@ CORELIB_OBJECTS =  \
 	$(__CORE_SRC_OBJECTS_3) \
 	$(__PLUGIN_SRC_OBJECTS_3)
 CORELIB_ODEP =  $(_____pch_wxprec_corelib_wx_wxprec_h_gch___depname)
-ADVDLL_CFLAGS = $(__advdll_PCH_INC) -D__WX$(TOOLKIT)__ $(__WXUNIV_DEFINE_p) \
+ADVDLL_CXXFLAGS = $(__advdll_PCH_INC) -D__WX$(TOOLKIT)__ $(__WXUNIV_DEFINE_p) \
 	$(__DEBUG_DEFINE_p) $(__EXCEPTIONS_DEFINE_p) $(__RTTI_DEFINE_p) \
 	$(__THREAD_DEFINE_p) -DWXBUILDING $(__INC_TIFF_BUILD_p) $(__INC_TIFF_p) \
 	$(__INC_JPEG_p) $(__INC_PNG_p) $(__INC_ZLIB_p) $(__INC_REGEX_p) \
-	$(__INC_EXPAT_p) -DWXUSINGDLL -DWXMAKINGDLL_ADV $(PIC_FLAG) $(CPPFLAGS) \
+	$(__INC_EXPAT_p) -DWXUSINGDLL -DWXMAKINGDLL_ADV $(PIC_FLAG) $(CXXWARNINGS) \
-	$(CFLAGS)
+	$(CPPFLAGS) $(CXXFLAGS)
 ADVDLL_OBJECTS =  \
-	$(__advdll___win32rc)
+	$(__advdll___win32rc) \
+	advdll_dummy.o
 ADVDLL_ODEP =  $(_____pch_wxprec_advdll_wx_wxprec_h_gch___depname)
-ADVLIB_CFLAGS = $(__advlib_PCH_INC) -D__WX$(TOOLKIT)__ $(__WXUNIV_DEFINE_p) \
+ADVLIB_CXXFLAGS = $(__advlib_PCH_INC) -D__WX$(TOOLKIT)__ $(__WXUNIV_DEFINE_p) \
 	$(__DEBUG_DEFINE_p) $(__EXCEPTIONS_DEFINE_p) $(__RTTI_DEFINE_p) \
 	$(__THREAD_DEFINE_p) -DWXBUILDING $(__INC_TIFF_BUILD_p) $(__INC_TIFF_p) \
 	$(__INC_JPEG_p) $(__INC_PNG_p) $(__INC_ZLIB_p) $(__INC_REGEX_p) \
-	$(__INC_EXPAT_p) $(CPPFLAGS) $(CFLAGS)
+	$(__INC_EXPAT_p) $(CXXWARNINGS) $(CPPFLAGS) $(CXXFLAGS)
+ADVLIB_OBJECTS =  \
+	advlib_dummy.o
+ADVLIB_ODEP =  $(_____pch_wxprec_advlib_wx_wxprec_h_gch___depname)
 MEDIADLL_CXXFLAGS = $(__mediadll_PCH_INC) -D__WX$(TOOLKIT)__ \
 	$(__WXUNIV_DEFINE_p) $(__DEBUG_DEFINE_p) $(__EXCEPTIONS_DEFINE_p) \
 	$(__RTTI_DEFINE_p) $(__THREAD_DEFINE_p) -DWXBUILDING $(__INC_TIFF_BUILD_p) \
@@ -11922,6 +11925,8 @@ COND_MONOLITHIC_0_SHARED_0_USE_GUI_1___advlib___depname = \
 @COND_GCC_PCH_1@__advlib_PCH_INC = -I./.pch/wxprec_advlib
 @COND_ICC_PCH_1@__advlib_PCH_INC = $(ICC_PCH_USE_SWITCH) \
 @COND_ICC_PCH_1@	./.pch/wxprec_advlib/wx/wxprec.h.gch
+@COND_USE_PCH_1@_____pch_wxprec_advlib_wx_wxprec_h_gch___depname \
+@COND_USE_PCH_1@	= ./.pch/wxprec_advlib/wx/wxprec.h.gch
 @COND_SHARED_1@____wxadv_namedll_DEP = $(__advdll___depname)
 @COND_SHARED_0@____wxadv_namelib_DEP = $(__advlib___depname)
 COND_MONOLITHIC_0_SHARED_1_USE_GUI_1_USE_MEDIA_1___mediadll___depname = \
@@ -14079,7 +14084,7 @@ distclean: clean
 @COND_MONOLITHIC_0_USE_GUI_1@wxcore: $(____wxcore_namedll_DEP) $(____wxcore_namelib_DEP)
 
 @COND_MONOLITHIC_0_SHARED_1_USE_GUI_1@$(LIBDIRNAME)/$(DLLPREFIX)$(WXDLLNAMEPREFIXGUI)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_adv$(WXCOMPILER)$(VENDORTAG)$(WXDLLVERSIONTAG)$(dll___targetsuf3): $(ADVDLL_OBJECTS) $(__wxtiff___depname) $(__wxjpeg___depname) $(__wxpng___depname) $(__wxscintilla___depname) $(__wxexpat___depname) $(__wxzlib___depname) $(__wxregex___depname) $(__advdll___win32rc) $(__coredll___depname) $(__basedll___depname)
-@COND_MONOLITHIC_0_SHARED_1_USE_GUI_1@	$(SHARED_LD_CC) $@ $(ADVDLL_OBJECTS) -L$(LIBDIRNAME) -L$(LIBDIRNAME)    -L$(LIBDIRNAME) $(__advdll___macinstnamecmd) $(__advdll___importlib) $(__advdll___soname_flags) $(WXMACVERSION_CMD) $(LDFLAGS)  $(__LIB_TIFF_p) $(__LIB_JPEG_p) $(__LIB_PNG_p)  $(EXTRALIBS_FOR_GUI) $(__LIB_ZLIB_p) $(__LIB_REGEX_p) $(__LIB_EXPAT_p) $(EXTRALIBS_FOR_BASE) -lwx_$(PORTNAME)$(WXUNIVNAME)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_core-$(WX_RELEASE)$(HOST_SUFFIX) -lwx_base$(WXBASEPORT)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)-$(WX_RELEASE)$(HOST_SUFFIX) $(PLUGIN_ADV_EXTRALIBS) $(LIBS)
+@COND_MONOLITHIC_0_SHARED_1_USE_GUI_1@	$(SHARED_LD_CXX) $@ $(ADVDLL_OBJECTS) -L$(LIBDIRNAME) -L$(LIBDIRNAME)    -L$(LIBDIRNAME) $(__advdll___macinstnamecmd) $(__advdll___importlib) $(__advdll___soname_flags) $(WXMACVERSION_CMD) $(LDFLAGS)  $(__LIB_TIFF_p) $(__LIB_JPEG_p) $(__LIB_PNG_p)  $(EXTRALIBS_FOR_GUI) $(__LIB_ZLIB_p) $(__LIB_REGEX_p) $(__LIB_EXPAT_p) $(EXTRALIBS_FOR_BASE) -lwx_$(PORTNAME)$(WXUNIVNAME)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_core-$(WX_RELEASE)$(HOST_SUFFIX) -lwx_base$(WXBASEPORT)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)-$(WX_RELEASE)$(HOST_SUFFIX) $(PLUGIN_ADV_EXTRALIBS) $(LIBS)
 @COND_MONOLITHIC_0_SHARED_1_USE_GUI_1@	$(DYLIB_RPATH_POSTLINK)
 @COND_MONOLITHIC_0_SHARED_1_USE_GUI_1@	
 @COND_MONOLITHIC_0_SHARED_1_USE_GUI_1@	$(__advdll___so_symlinks_cmd)
@@ -14096,11 +14101,11 @@ distclean: clean
 @COND_MONOLITHIC_0_SHARED_1_USE_GUI_1@	(cd $(DESTDIR)$(libdir) ; $(__advdll___so_symlinks_uninst_cmd))
 
 @COND_USE_PCH_1@./.pch/wxprec_advdll/wx/wxprec.h.gch: 
-@COND_USE_PCH_1@	$(BK_MAKE_PCH) ./.pch/wxprec_advdll/wx/wxprec.h.gch wx/wxprec.h $(CC) $(ADVDLL_CFLAGS)
+@COND_USE_PCH_1@	$(BK_MAKE_PCH) ./.pch/wxprec_advdll/wx/wxprec.h.gch wx/wxprec.h $(CXX) $(ADVDLL_CXXFLAGS)
 
-@COND_MONOLITHIC_0_SHARED_0_USE_GUI_1@$(LIBDIRNAME)/$(LIBPREFIX)wx_$(PORTNAME)$(WXUNIVNAME)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_adv-$(WX_RELEASE)$(HOST_SUFFIX)$(LIBEXT): 
+@COND_MONOLITHIC_0_SHARED_0_USE_GUI_1@$(LIBDIRNAME)/$(LIBPREFIX)wx_$(PORTNAME)$(WXUNIVNAME)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_adv-$(WX_RELEASE)$(HOST_SUFFIX)$(LIBEXT): $(ADVLIB_OBJECTS)
 @COND_MONOLITHIC_0_SHARED_0_USE_GUI_1@	rm -f $@
-@COND_MONOLITHIC_0_SHARED_0_USE_GUI_1@	$(AR) $(AROPTIONS) $@
+@COND_MONOLITHIC_0_SHARED_0_USE_GUI_1@	$(AR) $(AROPTIONS) $@ $(ADVLIB_OBJECTS)
 @COND_MONOLITHIC_0_SHARED_0_USE_GUI_1@	$(RANLIB) $@
 
 @COND_MONOLITHIC_0_SHARED_0_USE_GUI_1@install_advlib: $(__advlib___depname)
@@ -14111,7 +14116,7 @@ distclean: clean
 @COND_MONOLITHIC_0_SHARED_0_USE_GUI_1@	rm -f $(DESTDIR)$(libdir)/$(LIBPREFIX)wx_$(PORTNAME)$(WXUNIVNAME)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_adv-$(WX_RELEASE)$(HOST_SUFFIX)$(LIBEXT)
 
 @COND_USE_PCH_1@./.pch/wxprec_advlib/wx/wxprec.h.gch: 
-@COND_USE_PCH_1@	$(BK_MAKE_PCH) ./.pch/wxprec_advlib/wx/wxprec.h.gch wx/wxprec.h $(CC) $(ADVLIB_CFLAGS)
+@COND_USE_PCH_1@	$(BK_MAKE_PCH) ./.pch/wxprec_advlib/wx/wxprec.h.gch wx/wxprec.h $(CXX) $(ADVLIB_CXXFLAGS)
 
 @COND_MONOLITHIC_0_USE_GUI_1@wxadv: $(____wxadv_namedll_DEP) $(____wxadv_namelib_DEP)
 
@@ -35472,6 +35477,12 @@ corelib_sound_sdl.o: $(srcdir)/src/unix/sound_sdl.cpp $(CORELIB_ODEP)
 advdll_version_rc.o: $(srcdir)/src/msw/version.rc $(ADVDLL_ODEP)
 	$(WINDRES) -i$< -o$@    --define __WX$(TOOLKIT)__ $(__WXUNIV_DEFINE_p_67) $(__DEBUG_DEFINE_p_66)  $(__EXCEPTIONS_DEFINE_p_65) $(__RTTI_DEFINE_p_65) $(__THREAD_DEFINE_p_65)  --define WXBUILDING --define WXDLLNAME=$(WXDLLNAMEPREFIXGUI)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_adv$(WXCOMPILER)$(VENDORTAG)$(WXDLLVERSIONTAG) $(__RCDEFDIR_p) --include-dir $(top_srcdir)/include $(__INC_TIFF_BUILD_p_66) $(__INC_TIFF_p_66) $(__INC_JPEG_p_66) $(__INC_PNG_p_65) $(__INC_ZLIB_p_67) $(__INC_REGEX_p_65) $(__INC_EXPAT_p_65) --define WXUSINGDLL --define WXMAKINGDLL_ADV
 
+advdll_dummy.o: $(srcdir)/src/common/dummy.cpp $(ADVDLL_ODEP)
+	$(CXXC) -c -o $@ $(ADVDLL_CXXFLAGS) $(srcdir)/src/common/dummy.cpp
+
+advlib_dummy.o: $(srcdir)/src/common/dummy.cpp $(ADVLIB_ODEP)
+	$(CXXC) -c -o $@ $(ADVLIB_CXXFLAGS) $(srcdir)/src/common/dummy.cpp
+
 mediadll_version_rc.o: $(srcdir)/src/msw/version.rc $(MEDIADLL_ODEP)
 	$(WINDRES) -i$< -o$@    --define __WX$(TOOLKIT)__ $(__WXUNIV_DEFINE_p_67) $(__DEBUG_DEFINE_p_66)  $(__EXCEPTIONS_DEFINE_p_65) $(__RTTI_DEFINE_p_65) $(__THREAD_DEFINE_p_65)  --define WXBUILDING --define WXDLLNAME=$(WXDLLNAMEPREFIXGUI)$(WXUNICODEFLAG)$(WXDEBUGFLAG)$(WX_LIB_FLAVOUR)_media$(WXCOMPILER)$(VENDORTAG)$(WXDLLVERSIONTAG) $(__RCDEFDIR_p) --include-dir $(top_srcdir)/include $(__INC_TIFF_BUILD_p_66) $(__INC_TIFF_p_66) $(__INC_JPEG_p_66) $(__INC_PNG_p_65) $(__INC_ZLIB_p_67) $(__INC_REGEX_p_65) $(__INC_EXPAT_p_65) --define WXUSINGDLL --define WXMAKINGDLL_MEDIA
 

build/bakefiles/files.bkl

@@ -3591,7 +3591,17 @@ IMPORTANT: please read docs/tech/tn0016.txt before modifying this file!
     </set>
 
     <!-- wxAdvanced: empty, kept only for backwards compatibility -->
-    <set var="ADVANCED_SRC" hints="files"/>
+    <set var="ADVANCED_SRC" hints="files">
+        <!-- When not using autoconf, it's part of wx_lib_b template. -->
+        <if cond="FORMAT=='autoconf'">
+            <!--
+                But otherwise we need to compile at least a single file as
+                part of the library, at least some versions of ar refuse to
+                create an empty static library without any files, for example.
+             -->
+            src/common/dummy.cpp
+        </if>
+    </set>
     <set var="ADVANCED_HDR" hints="files"/>
 
     <!-- wxMedia files: -->