Howdy, I find a problem when upgraded g++ from 4.4.1 to 4.4.2. Original g++ generates code with "System V ABI", but new g++ generates code with "Linux ABI". I don't know what difference between them, but the output .so file from g++ 4.4.2 cannot be used in g++ 4.4.1.
To describe my problem clear, I have two x86-64 PCs with RedHat Linux. g++ 4.4.1 is installed in PC1, while 4.4.2 is installed in PC2. If I copy the executable file compiled by PC1 to PC2, and run "ldd a.out", it prints the related modules. But if I copy the executable file compiled by PC2 to PC1, and run "ldd a.out", it prints error message for "not a dynamic executable". Therefore, it seem the gcc tool-chain have backward compatibility for "System V" and "Linux" ABI. Could you tell me why g++ changes ABI? and why cannot I find any thing about it from the changelog of gcc 4.4.2? Is there a way to specify ABI in gcc command line on x86/64 platform? Thank you in advance. -- ShenLei
