SJLJ (setjmp/longjmp):
available for 32 bit and 64 bit
not “zero-cost”: even if an exception isn’t thrown, it incurs a minor performance penalty (~15% in exception heavy code) but sometimes the penalty can be more significant:
https://bugreports.qt-project.org/browse/QTBUG-29653 allows exceptions to traverse through e.g. windows callbacks
DWARF (DW2, dwarf-2)
available for 32 bit only
no permanent runtime overhead
needs whole call stack to be dwarf-enabled, which means exceptions cannot be thrown over e.g. Windows system DLLs.
SEH (zero overhead exception)
will be available for 64-bit GCC 4.8.
rubenvb release is available [sourceforge.net] targetting Win64/Personal Builds/rubenvb/gcc-4.8-release/x86_64-w64-mingw32-gcc-4.8.0-win64_rubenvb.7z/download
MinGW-builds release is available [sourceforge.net]
详情见
http://qt-project.org/wiki/MinGW-64-bit
