Thiago Macieira schrieb:
It's working because tt uses the export macro in a slightly different way then we do. Q_DECL_IMPORT is never used on linux.Christian Ehrlicher said:and while this works on Win32, it breaks on linux because Q_DECL_EXPORT doesn't evaluate to default-visibility (don't know the gcc command for that) but to nothing. At least on a "default-built" qt-copy.It's not the fault of Q_DECL_EXPORT but Q_DECL_IMPORT which is defined to nothing on linux.That's not a problem on ELF/x86, but I do wonder how it compiles at all under 64-bit. Symbols marked "hidden" tell the compiler it can generate shorter calls, instead of emitting a relocation to a full 64-bit jump. On x86-64, that would be a 32-bit RIP-relative call; on Itanium, it would probably be a one of the weird lengths, like 21- or 25-bit jump. (Itanium can encode short immediates in a single 41-bit instruction, but a full 64-bit displacement requires three instructions, 128 bits)
Christian
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