LNK2001
in [Visual C]
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From: Jacky Luk on 15 Jun 2005 04:35 Hi, I have a project for a debugger which I want to recompile ***in file emu1_module1.asm, I have PUBLIC main_IT main_IT instr_properties <<0, 0, 0>, 0, 0> ;NN_null ***in file emu1.inc, I have main_IT equ ?main_IT@@3PAUinstr_properties@@A ***in file winNT_x86_emulator.cpp, I have extern instr_properties main_IT[]; and int Main(HINSTANCE hInstance, DWORD reason, DWORD reserved) {int instr_num, i; if (reason == DLL_PROCESS_ATTACH) {indexed_IT = (instr_properties*)LocalAlloc(LPTR, sizeof(instr_properties) * NN_last); instr_num = (sizeof(instructions_associate) / sizeof(sDEFAULT)) / 2; for (i = 1; i < instr_num; i++) {memcpy(&indexed_IT[instructions_associate[i * 2]], &main_IT[instructions_associate[i * 2 + 1]], sizeof(instr_properties));}} return true;} The result... emu86 error LNK2001: unresolved external symbol "struct instr_properties * main_IT" (?main_IT@@3PAUinstr_properties@@A) Thanks for any hints Jack
From: Jacky Luk on 15 Jun 2005 09:36 Hi, seems like VC++ 6 cannot process assembly files. Does the VC++ compiler set include any assembler(s)? Thanks Jack "Jacky Luk" <jl(a)knight.com> ýýýgýýlýýsýD:OIafsUYcFHA.1404(a)TK2MSFTNGP09.phx.gbl... > Hi, I have a project for a debugger which I want to recompile > ***in file emu1_module1.asm, I have > > PUBLIC main_IT > main_IT instr_properties <<0, 0, 0>, 0, 0> ;NN_null > > ***in file emu1.inc, I have > > main_IT equ ?main_IT@@3PAUinstr_properties@@A > > ***in file winNT_x86_emulator.cpp, I have > > extern instr_properties main_IT[]; > > and > > int Main(HINSTANCE hInstance, DWORD reason, DWORD reserved) > {int instr_num, i; > > if (reason == DLL_PROCESS_ATTACH) > {indexed_IT = (instr_properties*)LocalAlloc(LPTR, > sizeof(instr_properties) * NN_last); > instr_num = (sizeof(instructions_associate) / sizeof(sDEFAULT)) / 2; > > for (i = 1; i < instr_num; i++) > {memcpy(&indexed_IT[instructions_associate[i * 2]], > &main_IT[instructions_associate[i * 2 + 1]], > sizeof(instr_properties));}} > > return true;} > > > The result... > emu86 error LNK2001: unresolved external symbol "struct instr_properties * > main_IT" (?main_IT@@3PAUinstr_properties@@A) > > > > Thanks for any hints > Jack > > > >
From: Victor Bazarov on 15 Jun 2005 09:41 Jacky Luk wrote: > Hi, I have a project for a debugger which I want to recompile > ***in file emu1_module1.asm, I have > > PUBLIC main_IT > main_IT instr_properties <<0, 0, 0>, 0, 0> ;NN_null Is this a declaration? My MASM is rather rusty... Is this supposed to make 'main_IT' external? If so, the name of the symbol is "main_IT", literally. You should consider making it '_main_IT' (notice the leading underscore). > ***in file emu1.inc, I have > > main_IT equ ?main_IT@@3PAUinstr_properties@@A This is a definition of 'main_IT' and its initialisation to an address, IIRC. You should probably again consider renaming it to '_main_IT'. > ***in file winNT_x86_emulator.cpp, I have > > extern instr_properties main_IT[]; This is a declaration of 'main_IT'. Since you didn't give it "C" linkage, the compiler will try to stuff all the type information into that, and you get a mangled name (probably the one that the linker flags as unresolved, '?main_IT@@3PAUinstr_properties@@A'). You should do extern "C" instr_properties *main_IT; here. This will generate '_main_IT' name to be resolved. > > and > > int Main(HINSTANCE hInstance, DWORD reason, DWORD reserved) > {int instr_num, i; > > if (reason == DLL_PROCESS_ATTACH) > {indexed_IT = (instr_properties*)LocalAlloc(LPTR, sizeof(instr_properties) > * NN_last); > instr_num = (sizeof(instructions_associate) / sizeof(sDEFAULT)) / 2; > > for (i = 1; i < instr_num; i++) > {memcpy(&indexed_IT[instructions_associate[i * 2]], > &main_IT[instructions_associate[i * 2 + 1]], > sizeof(instr_properties));}} > > return true;} > > > The result... > emu86 error LNK2001: unresolved external symbol "struct instr_properties * > main_IT" (?main_IT@@3PAUinstr_properties@@A) See my recommendations above. V
From: Carl Daniel [VC++ MVP] on 15 Jun 2005 09:43 Jacky Luk wrote: > Hi, I have a project for a debugger which I want to recompile > ***in file emu1_module1.asm, I have > > PUBLIC main_IT > main_IT instr_properties <<0, 0, 0>, 0, 0> ;NN_null > > ***in file emu1.inc, I have > > main_IT equ ?main_IT@@3PAUinstr_properties@@A > > ***in file winNT_x86_emulator.cpp, I have > > extern instr_properties main_IT[]; > > and > > int Main(HINSTANCE hInstance, DWORD reason, DWORD reserved) > {int instr_num, i; > > if (reason == DLL_PROCESS_ATTACH) > {indexed_IT = (instr_properties*)LocalAlloc(LPTR, > sizeof(instr_properties) * NN_last); > instr_num = (sizeof(instructions_associate) / sizeof(sDEFAULT)) / 2; > > for (i = 1; i < instr_num; i++) > {memcpy(&indexed_IT[instructions_associate[i * 2]], > &main_IT[instructions_associate[i * 2 + 1]], > sizeof(instr_properties));}} > > return true;} > > > The result... > emu86 error LNK2001: unresolved external symbol "struct > instr_properties * main_IT" (?main_IT@@3PAUinstr_properties@@A) The error is telling you plainly what's wrong: The compiler emitted a reference to ?main_IT@@3PAUinstr_properties@@A while your assembly module defined a public symbol named main_IT. The use of the equ directive doesn't do anything like what you're trying to do and is not helpful in this situation. Rather, what you need to do is simple: Remove all mention of the mangaled C++ symbol from your .asm file, and change your .cpp file to read extern "C" instr_properties main_IT[]; -cd
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