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[Bug ld/12762] LTO on Windows is broken (C++)
From: |
vanboxem.ruben at gmail dot com |
Subject: |
[Bug ld/12762] LTO on Windows is broken (C++) |
Date: |
Sun, 23 Sep 2012 20:33:53 +0000 |
http://sourceware.org/bugzilla/show_bug.cgi?id=12762
--- Comment #30 from vanboxem.ruben at gmail dot com 2012-09-23 20:33:53 UTC ---
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)
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