[Bug ld/12762] LTO on Windows is broken (C++)

[xunxun1982 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12762

--- Comment #31 from xunxun <xunxun1982 at gmail dot com> 2013-04-30 09:37:49 
UTC ---
(In reply to comment #30)
> The original problem has shifted somewhat. Using GCC 4.7.2 and ld
> 2.23.51.20120920, the first link error I get now when compiling Qt (where I
> originally met the issue) with -flto (and of course linking with the same
> option) is the following:
> 
> 
> g++ -Wl,-s -mthreads -flto -shared
> -Wl,--out-implib,d:\Development\x64\Qt\lib\libQtXml4.a -o ..\..\lib\QtXml4.dll
> tmp/obj/release_shared/qdom.o tmp/obj/release_shared/qxml.o
> tmp/obj/release_shared/qxmlstream.o  -L"d:\Development\x64\Qt\lib"
> -L"d:\Development\x64\Qt\lib" tmp\obj\release_shared\QtXml_resource_res.o
> -lQtCore4
> R:\ccPQQQpC.ltrans23.ltrans.o:ccPQQQpC.ltrans23.o:(.text+0x1d05): undefined
> reference to `__imp__ZTV12QTextOStream.local.415.4022'
> R:\ccPQQQpC.ltrans23.ltrans.o:ccPQQQpC.ltrans23.o:(.text+0x1d43): undefined
> reference to `__imp__ZTV12QTextOStream.local.415.4022'
> R:\ccPQQQpC.ltrans23.ltrans.o:ccPQQQpC.ltrans23.o:(.text+0x1d81): undefined
> reference to `__imp__ZTV12QTextIStream.local.414.4003'
> R:\ccPQQQpC.ltrans23.ltrans.o:ccPQQQpC.ltrans23.o:(.text+0x1dbf): undefined
> reference to `__imp__ZTV12QTextIStream.local.414.4003'
> d:/development/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/4.7.2/../../../../x86_64-w64-mingw32/bin/ld.exe:
> R:\ccPQQQpC.ltrans23.ltrans.o: bad reloc address 0x8 in section `.data'
> collect2.exe: error: ld returned 1 exit status
> mingw32-make[2]: *** [..\..\lib\QtXml4.dll] Error 1
> mingw32-make[2]: Leaving directory `D:/Development/x64/Qt/src/xml'
> 
> Which means that a bunch of libraries now build, and the Qt build utilities
> that I believe could not be built are now built fine.
> The above symbol(s) ran through C++filt say: "vtable for QTextOStream".
> 
> Another small C++ project consisting of a static library and an app compiles
> without a hitch with -flto (and it works fine too)

It's very same with http://sourceware.org/bugzilla/show_bug.cgi?id=13031

I use -flto-partition=none to workaround it.

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