Details
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Bug
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Resolution: Done
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P2: Important
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5.10.0
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None
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g++ (SUSE Linux) 7.2.1 20171005 [gcc-7-branch revision 253439]
GNU gold (GNU Binutils; openSUSE Leap 42.3 2.29.1) 1.14
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7910dd0a548cdd9e7c5716d4f6704b3185fa34fb
Description
Compiling the wearable example is an easy way to reproduce triggering the following:
g++ -Wl,-rpath,<...>/qt-5.10.0/install/lib -Wl,-rpath-link,<...>/qt-5.10.0/install/lib -o wearable wearable.o qrc_wearable.o -L<...>/qt-5.10.0/install/lib -lQt5QuickControls2 -L<...>/sqlite-3.21.00.00/install/lib64 -lQt5Quick -lQt5Gui -lQt5Qml -lQt5Network -lQt5Core -lGL -lpthread <...>/qt-5.10.0/install/lib/libQt5QuickTemplates2.so.5:(*IND*+0x0): multiple definition of `_edata' <...>/qt-5.10.0/install/lib/libQt5QuickTemplates2.so.5:(*IND*+0x0): multiple definition of `__bss_start' Makefile:251: recipe for target 'wearable' failed
though we also run into the same issue with our own projects (where Qt v5.9.3 is working fine)
see also closed ---QTBUG-63083
readelf --syms qt-5.10.0/install/lib/libQt5QuickTemplates2.so | grep bss_start 3385: 000000000012e468 0 NOTYPE GLOBAL DEFAULT 18 __bss_start@@Qt_5_PRIVATE_API 3387: 000000000012e468 0 NOTYPE GLOBAL DEFAULT 18 __bss_start@Qt_5_PRIVATE_API 5624: 000000000012e468 0 NOTYPE GLOBAL DEFAULT 18 __bss_start 5626: 000000000012e468 0 NOTYPE GLOBAL DEFAULT 18 __bss_start readelf --syms qt-5.10.0/install/lib/libQt5QuickTemplates2.so | grep edata 3384: 000000000012e468 0 NOTYPE GLOBAL DEFAULT 18 _edata@@Qt_5_PRIVATE_API 3386: 000000000012e468 0 NOTYPE GLOBAL DEFAULT 18 _edata@Qt_5_PRIVATE_API 5623: 000000000012e468 0 NOTYPE GLOBAL DEFAULT 18 _edata 5625: 000000000012e468 0 NOTYPE GLOBAL DEFAULT 18 _edata
it looks like not only QtQuickTemplate has this issue, I see the same in Core, DesignerComponents, EglFsKmsSupport, MultimediaGstTools, MultimediaQuick, QuickParticles, QuickTemplates2, XcbQpa)
though it seems to be known issue with the gold linker (see also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=852035), I can't help wondering why the qt v5.9.3 I rebuild as recent as two weeks ago (so 'most likely' using the same environment) shows these symbols as "NOTYPE GLOBAL DEFAULT ABS", so not relocatable, which is probably why the regular linker had no issues with that
Compiling v5.10.0 with the option '-no-use-gold-linker' results in
readelf --syms qt-5.10.0/install/lib/libQt5QuickTemplates2.so | grep bss_start 2587: 000000000032f148 0 NOTYPE GLOBAL DEFAULT 27 __bss_start@@Qt_5_PRIVATE_API 4251: 000000000032f148 0 NOTYPE GLOBAL DEFAULT 27 __bss_start
The mentioned earlier qtbug focuses on yocto,
We verified that for Qt libs built using the gold linker, both our own projects as well as the wearable example link fine when enforcing use of the gold linker by adding "QMAKE_LFLAGS += -fuse-ld=gold" to the project.
I'm unsure whether the above is Qt's problem at all, though.