58 lines
2.2 KiB
Plaintext
58 lines
2.2 KiB
Plaintext
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g++5 ABI test tool
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==================
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This is a simple tool to test a system for g++5's libstdc++ at runtime.
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GCC5.1 introduced a new library ABI for the C++ standard library.
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The old 3.4 .. 5.0 ABI is not compatible.
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Some GNU/Linux distributions systems switched to the new ABI already
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and compile plugins with the new gcc.
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If a plugin uses a c++ library that is also shipped with ardour-bundles,
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the ABI of that library must match. Currently known cases: gtkmm, glibmm.
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e.g. Ingen or eq10q provided by a distro compiled with gcc5 will not
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load in Ardour as provided by ardour.org compiled with gcc4 because ardour
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ships an incompatible gtkmm, glibmm, cairomm, ...
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The plugin will fail to load. For example:
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```
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suil error: Unable to open UI library /usr/lib/lv2/sapistaEQv2.lv2/gui/eq10qs_gui.so (/usr/lib/lv2/sapistaEQv2.lv2/gui/eq10qs_gui.so: undefined symbol: _ZN4Glib7ustringC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE)
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suil error: Unable to open UI library /usr/lib/lv2/vocproc.lv2/vocproc_gui.so (/usr/lib/lv2/vocproc.lv2/vocproc_gui.so: undefined symbol: _ZN3Gtk7Builder13add_from_fileERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE)
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lilv_lib_open(): error: Failed to open library /usr/lib/lv2/ingen.lv2/libingen_lv2.so (/usr/lib/libingen.so.0: undefined symbol: _ZN4Glib6ModuleC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEENS_11ModuleFlagsEEE)
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```
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ie `Glib::ustring::ustring(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)`
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Compilation
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-----------
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This tool must be compiled on a system with gcc5.1 or later.
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make
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will fail the resulting binary does not use the new __cxx11 ABI.
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The resulting binary will *not* run on systems with only the old ABI.
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For convenience (packaging gcc4 builds), pre-compiled binaries are included.
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Check
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-----
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The idea is to include the precompiled binaries in the installer
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- Ardour/gcc-4 installer must fail if the binary runs
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- Ardour/gcc-5 installer must fail if the binary does not run
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References
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----------
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https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html
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https://wiki.debian.org/GCC5
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https://mail.gnome.org/archives/gtkmm-list/2015-June/thread.html
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