#8391 closed patch (fixed)
makeInstance with MS VC++7
| Reported by: | SF/h00ligan | Owned by: | fingolfin |
|---|---|---|---|
| Priority: | normal | Component: | Port: Linux |
| Version: | Keywords: | ||
| Cc: | Game: |
Description
MS VC++7 stops compiling external function template makeInstance. workaround: - explicitly indicate namespace with "::" - move SingletonBaseType typedef to public section
Ticket imported from: #1095133. Ticket imported from: patches/496.
Attachments (4)
Change History (23)
by , 20 years ago
| Attachment: | MakeInstance.patch.bz2 added |
|---|
comment:1 by , 20 years ago
The changes to the friend lines won't compile for me with gcc 3.3.4 in linux (gentoo).
by , 20 years ago
| Attachment: | makeInstance.patch added |
|---|
comment:3 by , 20 years ago
after fingolfin patch apeared followed messages: ../../common\singleton.h(52) : error C2220: warning treated as error - no object file generated ../../common\singleton.h(52) : warning C4506: no definition for inline function 'OSystem *Common::Singleton<T>:: makeInstance(void)' with [ T=OSystem ]
after disabling (/wd4506) this message - scummvm runs well may definition "OSystem *Common::Singleton<OSystem>::makeInstance() { ....." be moved to declaration section?
comment:4 by , 20 years ago
I am not sure sure what you mean with "move to declaration section" -- if you mean "move to the header file", then no, that would not be OK.
Can you tell me the full error message? In particular, which files is it compiling at that point?
comment:5 by , 20 years ago
i attached my build log (with enabled C4506)
1) you quite right - definition should rest in cpp, but ms compiler assumed that "makeInstance" is inline method - and warn that it can't find method definition 2)__declspec(noinline) - did't remove warning 3)only /wd4506 option makes scummvm be compiled (but is it right solution?)
by , 20 years ago
| Attachment: | BuildLog.htm.bz2 added |
|---|
comment:6 by , 20 years ago
I googled for that warning, and the microsoft pages for it suggest adding an "extern" before the declaration. Does that help?
template <> extern OSystem *Common::Singleton<OSystem>::makeInstance();
(see also <http://msdn.microsoft.com/library/default.asp?url=/library/ en-us/vccore/html/C4506.asp>)
comment:7 by , 20 years ago
no it does not help:
../../common\system.h(38) : error C2220: warning treated as error - no object file generated ../../common\system.h(38) : warning C4630: 'Common:: Singleton<T>::makeInstance' : 'extern' storage-class specifier illegal on member definition with [ T=OSystem ]
comment:8 by , 20 years ago
Well, I applied my patch for now -- at least with it you only get a warning, not errors.
For now, I'd say just ignore warning 4506, as we don't want to inline that piece of code anyway. Maybe you can use some #pragma surrounding the offending code for that?
comment:9 by , 20 years ago
I wonder if that's why I can no longer compile ScummVM under MinGW. I get the following linking errors:
ase/libbase.a(main.o)(.text+0x1424): In function `main': c:/Privat/CygWin/home/torbjorn/Debian/CVS/ScummVM+hack/common/singleton.h:63: undefined reference to `Common::Singleton<OSystem>::makeInstance()' base/libbase.a(engine.o)(.text+0x1407): In function `Z5errorPKcz': c:/Privat/CygWin/home/torbjorn/Debian/CVS/ScummVM+hack/common/singleton.h:63: undefined reference to `Common::Singleton<OSystem>::makeInstance()' base/libbase.a(gameDetector.o)(.text+0x5d6f): In function `ZN12GameDetector16parseCommandLineEiPPc': c:/Privat/CygWin/home/torbjorn/Debian/CVS/ScummVM+hack/common/singleton.h:63: undefined reference to `Common::Singleton<OSystem>::makeInstance()' scumm/libscumm.a(scumm.o)(.text+0xe69b): In function `Z19Engine_SCUMM_createP12GameDetectorP7OSystem': c:/Privat/CygWin/home/torbjorn/Debian/CVS/ScummVM+hack/common/singleton.h:63: undefined reference to `Common::Singleton<OSystem>::makeInstance()' scumm/libscumm.a(dialogs.o)(.text+0x2e2b): In function `ZN5Scumm14MainMenuDialog4saveEv': c:/Privat/CygWin/home/torbjorn/Debian/CVS/ScummVM+hack/common/singleton.h:63: undefined reference to `Common::Singleton<OSystem>::makeInstance()' scumm/libscumm.a(dialogs.o)(.text+0x2e6d):c:/Privat/CygWin/home/torbjorn/Debian/CVS/ScummVM+hack/common/singleton.h:63: more undefined references to `Common::Singleton<OSystem>::makeInstance()' follow make: *** [scummvm.exe] Error 1
I'm using GCC 3.2.3, which is admittedly somewhat old, but that's what I get when I install the latest stable MinGW and MSYS packages.
It stopped working some time today (January 7). It worked yesterday.
comment:10 by , 20 years ago
OK folks, what about this new patch, does it help Mingw? (and what does it do to the MSVC warning, I wonder...)
comment:11 by , 20 years ago
Should have done a full build before submitting this: I get link errors with my patch, because of course now code for makeInstance is created multiple times, causing a duplicate symbol link error.
Anyway, still would be interesting to know what effect the patch has on Mingw / MSVC
comment:12 by , 20 years ago
erik,
I discovered that the SF.net compile farm shell server (!) runs GCC 3.2.3, so I was able to do some testing with it :-). I really believe that this is a compile error, but at least I found a work around. Sadly, that work around breaks linking with GCC 3.3 <sigh>.
Anyway: just move the implementation of OSystem's makeInstance from system.cpp to system.h (replace the declaration of it in there, for example). That made it link just fine on the test system.
comment:13 by , 20 years ago
Yes, that seems to work for me too. (But don't worry, I won't commit it. :-)
comment:14 by , 20 years ago
If specializations cause trouble, it should also be possible to do this with inheritance:
in Common::Singleton<T>::instance(), call T::makeInstance(). Make Common::Singleton<T>::makeInstance() the default 'new T()' function, and make (for instance) OSystem::makeInstance() the specialized version.
comment:15 by , 20 years ago
I can compile ScummVM with GCC 3.2.3 again. Perhaps the recent header file changes helped somehow?
comment:16 by , 20 years ago
Well, I implemented wjp's suggestion, that's all. And I tested it on GCC 3.2.3, too (see also the commit message).
I wonder how MSVC copes with this -- and if maybe we don't need to turn that warning off anymore.
comment:17 by , 20 years ago
last wjp suggested patch - helps to re enable "no definition for inline function" warning in MSVC scummvm compiles well
comment:18 by , 20 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
comment:19 by , 6 years ago
| Component: | → Port: Linux |
|---|
makeInstance patch