編程不依賴

Question

我試圖做一個PE（Portable Executable將與Windows XP +工作並沒有依賴性。

我發現本指南非常有趣http://www.catch22.net/tuts/reducing-executable-size

#define WIN32_LEAN_AND_MEAN 

#include <windows.h> 

extern "C" int __cdecl __purecall(void) 
{ 
    return 0; 
} 

extern "C" int __cdecl main(); 

extern "C" int __cdecl mainCRTStartup(void) 
{ 
    int mainret; 

    mainret = main(); 

    ExitProcess(mainret); 
} 

我編譯它

g++ -Wall -o2 -s -nodefaultlibs main.cpp -o test.exe 

而且它給了我一堆錯誤：http://i.stack.imgur.com/fIFoD.png

C:\Users\Main.cpp\Desktop\crt>g++ -Wall -o2 -s -nodefaultlibs -lkernel32 main.cpp -o test.exe 
C:\Users\Main.cpp\AppData\Local\Temp\cczgOKUx.o:main.cpp:(.text+0x1c): multiple definition of `mainCRTStartup' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x280): first defined here 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x5): undefined reference to `__dyn_tls_init_callback' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x39): undefined reference to `__cpu_features_init' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x3e): undefined reference to `_fpreset' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x4b): undefined reference to `_CRT_glob' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x73): undefined reference to `__getmainargs' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x78): undefined reference to `_CRT_fmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x82): undefined reference to `_imp___iob' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x87): undefined reference to `_fmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x96): undefined reference to `_setmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x9b): undefined reference to `_CRT_fmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0xaa): undefined reference to `_setmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0xaf): undefined reference to `_CRT_fmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0xbe): undefined reference to `_setmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0xc3): undefined reference to `__p__fmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0xc9): undefined reference to `_fmode' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0xd0): undefined reference to `_pei386_runtime_relocator' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0xd8): undefined reference to `__main' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0xdd): undefined reference to `__p__environ' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x100): undefined reference to `_cexit' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x13f): undefined reference to `signal' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x195): undefined reference to `signal' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x1d0): undefined reference to `signal' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x217): undefined reference to `signal' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x233): undefined reference to `signal' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x250): more undefined references to `signal' follow 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x266): undefined reference to `_fpreset' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x28c): undefined reference to `_imp____set_app_type' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x2ac): undefined reference to `_imp____set_app_type' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x2c1): undefined reference to `_imp__atexit' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o:crt1.c:(.text+0x2d1): undefined reference to `_imp___onexit' 
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../../mingw32/bin/ld.exe: C:/TDM-GCC-32/bin/../lib/gcc/mingw32/5.1.0/../../../crt2.o: bad reloc address 0x20 in section `.eh_frame' 
collect2.exe: error: ld returned 1 exit status 

據我瞭解，我的mainCRTStartup正在干擾我的編譯器添加的另一個mainCRTStartup。

我在Windows上使用TDM-GCC。

在使用-nostdlib而不是-nodefaultlibs的建議後，我得到的錯誤要少得多。

那些我現在有是

C:\Users\Main.cpp\AppData\Local\Temp\ccMYa3VN.o:main.cpp:(.text+0x11): undefined reference to `__main' 
C:\Users\Main.cpp\AppData\Local\Temp\ccMYa3VN.o:main.cpp:(.text+0x31): undefined reference to `ExitProcess@4' 

Answer 1

GCC使用一些內部的子程序，包含在libgcc.a，這是不能被排除在外。
見https://gcc.gnu.org/onlinedocs/gcc-5.3.0/gcc/Link-Options.html#Link-Options：

一個由-nostdlib繞過了標準庫和-nodefaultlibs 是libgcc.a中，內部的子程序庫，GCC用來 克服特定機器的不足之處，或有特殊需要的 一些語言。 （有關 libgcc.a的更多討論，請參閱與GCC輸出的接口。）在大多數情況下，即使您希望 避免使用其他標準庫，也需要libgcc.a。換句話說，當你指定 -nostdlib或-nodefaultlibs時，你通常應該指定-lgcc。這確保您沒有未解決的對內部GCC 庫子例程的引用。

P.S.函數ExitProcess和SetUnhandledExceptionFilter來自kernel32.lib，即您必須在鏈接器流中包含。您可以減少庫，但不能省略系統和操作系統庫。