Jonathan Lennox <lennox@xxxxxxxxxxxxxxx> writes: > Brian Dessent wrote: > > Jonathan Lennox wrote: > > > When optimization is turned on, and thus inline functions are actually > > > inlined, everything works fine. However, on Cygwin, when functions are not > > > inlined, I get link-time errors: the weak symbol emitted for the C++ code > > > conflicts with the backup definition. (This problem does not occur on > > > ELF-based systems, tested on GNU/Linux (RHEL 4) and Solaris 8.) > > > > > > Is this a gcc bug? > > > No, I think it's just a fact of life that PE/COFF has no concept of weak > > symbol visibility in the way that ELF does. You may be able to find > > more details on this in the binutils mailing list archives, but I think > > it's a fundamental restriction of Windows. There might be a different > > kind of workaround involving dllexport-type trickery, but I don't know. > > How does collect2 link multiply-defined C++ symbols on PE/COFF? Is there a > way to "manually" mark symbols in the same way from C code? Actually, PE/COFF does support weak symbols. They are recorded using storage class C_NT_WEAK == 105. They should be fully supported by the GNU binutils used on cygwin. The symbols should be reported as weak when using nm or objdump -t on the .o file. I don't know what is causing the problem here, but it's not the lack of weak symbols. Ian
