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copied!<p>If you feel like hacking around and want to get the best of both worlds (i.e. a small executable <em>and</em> the C runtime) in <em>release mode only</em>:</p> <ol> <li><p>Download and install the <a href="http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=11800" rel="nofollow">Windows Driver Kit</a>.</p></li> <li><p>In your project Properties, select Release and:</p> <ul> <li><p>Add the following to C/C++ -> General -> Include Directories:</p> <ul> <li><code>C:\WinDDK\7600.16385.1\inc\crt</code></li> <li><code>C:\WinDDK\7600.16385.1\inc\api</code></li> <li><code>C:\WinDDK\7600.16385.1\inc\atl71</code></li> <li><code>C:\WinDDK\7600.16385.1\inc\mfc42</code></li> </ul></li> <li><p>Set C/C++ -> Code Generation -> Runtime Library to <code>Multi-threaded DLL (/MD)</code>.</p></li> <li><p>Add the following to Linker -> General -> Additional Library Directories (choose the architecture/version as appropriate):</p> <ul> <li><code>C:\WinDDK\7600.16385.1\lib\Crt\i386</code></li> <li><code>C:\WinDDK\7600.16385.1\lib\wxp\i386</code> (use <code>wnet</code> instead of <code>wxp</code> for 64-bit)</li> <li><code>C:\WinDDK\7600.16385.1\lib\ATL\i386</code></li> <li><code>C:\WinDDK\7600.16385.1\lib\Mfc\i386</code></li> </ul></li> <li><p>Add <code>BufferOverflowU.lib</code> and <code>msvcrt_winxp.obj</code> under Linker -> Input -> Additional Dependencies.</p></li> <li><p>You might need to disable buffer overflow checking (<code>/GS-</code>)</p></li> </ul></li> <li><p>Rebuild.</p></li> <li><p>...</p></li> <li><p>Profit.*</p></li> </ol> <p><sub>* Duck and cover as people yell at you for using the WDK to build applications. :P</sub></p> <hr> <h2>Note:</h2> <p>If you use C++ exception handling, you will run into trouble.</p> <p>You will get an unresolved reference to <code>__CxxFrameHandler3</code>, because <code>msvcrt</code> only exports <code>__CxxFrameHandler</code>, which uses a different version of the frame handlers than VS 2008.</p> <p>It turns out Microsoft already has a hack for this in the WDK (<code>msvcrt_winxp.obj</code>), but it's a little bloated, so I just ("just") made a trimmed-down version instead (it took <strong>days</strong>).</p> <p>Long story short, you can fix it by including this assembly file in your project (make sure to define <code>_WIN64</code> for 64-bit -- the custom build step below does this for you):</p> <pre><code>; Custom build step (use for x64 only): ; ml64.exe /Fo"$(IntDir)\$(InputName).obj" /D_WIN64 /c /nologo /W3 /Zi /Ta "$(InputPath)" ; Custom build output: $(IntDir)\$(InputName).obj ; ; Relevant links: ; http://kobyk.wordpress.com/2007/07/20/dynamically-linking-with-msvcrtdll-using-visual-c-2005/ ; http://www.openrce.org/articles/full_view/21 ; http://blogs.msdn.com/b/freik/archive/2006/01/04/509372.aspx ifndef _WIN64 .386 .model flat, c endif option dotname extern __CxxFrameHandler: PROC ifdef _WIN64 extern __imp___CxxFrameHandler: PROC extern __imp_VirtualProtect: PROC extern __imp_Sleep: PROC extern __imp_GetVersion: PROC endif .data ifdef _WIN64 ;ProtectFlag EQU ?ProtectFlag@?1??__CxxFrameHandler3@@9@9 ProtectFlag dd ? endif ifdef _WIN64 endif .code ifdef _WIN64 includelib kernel32.lib endif includelib msvcrt.lib public __CxxFrameHandler3 ifdef _WIN64 __CxxFrameHandler3 proc frame else __CxxFrameHandler3 proc endif ifndef _WIN64 push ebp mov ebp,esp sub esp,28h push ebx push esi push edi cld mov dword ptr [ebp-4],eax mov esi,dword ptr [ebp-4] push 9 pop ecx lea edi,[ebp-28h] rep movs dword ptr es:[edi],dword ptr [esi] mov eax,dword ptr [ebp-28h] and eax,0F9930520h or eax,019930520h mov dword ptr [ebp-28h],eax lea eax,[ebp-28h] mov dword ptr [ebp-4],eax push dword ptr [ebp+14h] push dword ptr [ebp+10h] push dword ptr [ebp+0Ch] push dword ptr [ebp+8] mov eax,dword ptr [ebp-4] call __CxxFrameHandler add esp,10h pop edi pop esi pop ebx mov esp,ebp pop ebp ret else mov rax,rsp mov qword ptr [rax+8],rbx .savereg rbx, 50h mov qword ptr [rax+10h],rbp .savereg rbp, 58h mov qword ptr [rax+18h],rsi .savereg rsi, 60h push rdi .pushreg rdi push r12 .pushreg r12 push r13 .pushreg r13 sub rsp,30h .allocstack 30h .endprolog mov dword ptr [rax+20h],40h mov rax,qword ptr [r9+38h] mov rdi,r9 mov ebx,dword ptr [rax] mov rsi,r8 mov rbp,rdx add rbx,qword ptr [r9+8] mov r12,rcx mov eax,dword ptr [rbx] and eax,1FFFFFFFh cmp eax,19930520h je L140001261 mov r13d,1 mov eax,r13d lock xadd dword ptr [ProtectFlag],eax add eax,r13d cmp eax,r13d je L140001217 L1400011F0: lock add dword ptr [ProtectFlag],0FFFFFFFFh mov ecx,0Ah call qword ptr [__imp_Sleep] mov r11d,r13d lock xadd dword ptr [ProtectFlag],r11d add r11d,r13d cmp r11d,r13d jne L1400011F0 L140001217: mov r8d,dword ptr [rsp+68h] mov r13d,4 lea r9,[rsp+20h] mov rdx,r13 mov rcx,rbx call qword ptr [__imp_VirtualProtect] test eax,eax je L140001259 and dword ptr [rbx],0F9930520h or dword ptr [rbx],19930520h mov r8d,dword ptr [rsp+20h] lea r9,[rsp+68h] mov rdx,r13 mov rcx,rbx call qword ptr [__imp_VirtualProtect] L140001259: lock add dword ptr [ProtectFlag],0FFFFFFFFh L140001261: mov r9,rdi mov r8,rsi mov rdx,rbp mov rcx,r12 call qword ptr [__imp___CxxFrameHandler] mov rbx,qword ptr [rsp+50h] mov rbp,qword ptr [rsp+58h] mov rsi,qword ptr [rsp+60h] add rsp,30h pop r13 pop r12 pop rdi ret endif __CxxFrameHandler3 endp end </code></pre> <p>(Note: You can't implement this in C or C++, because the calling convention is different from the ones that C/C++ uses -- it seems to be an undocumented format that assumes registers are set a certain way.)</p> <p>If you get unresolved references to <code>_chkstk</code> or <code>_alloca</code> or whatever, just find a version of <code>alloca16.asm</code> in your CRT (should be in Visual Studio's CRT) and use that.</p>

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