Question

我正在尝试制作一个PE（Portable Executable，它可以与Windows XP +一起使用，并且没有依赖关系。

我发现本指南非常有趣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);
}

我用

编译它

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

它给了我一堆错误：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

据我所知，我的mainCRTStartup干扰了我的编译器正在添加的另一个mainCRTStartup。

我在Windows上使用TDM-GCC。

建议使用-nostdlib代替-nodefaultlibs后，我的错误会少得多。

我目前拥有的是

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OracleConnection _cn = new OracleConnection(); OracleTransaction _trn = _cn.BeginTransaction(); // command 1 OracleCommand _cmd = new OracleCommand(); _cmd.Transaction = _trn; // command 2, 3, etc if (!error) { _trn.Commit(); } else { _trn.Rollback(); }中包含的一些内部子程序，这些子程序无法排除见https://gcc.gnu.org/onlinedocs/gcc-5.3.0/gcc/Link-Options.html#Link-Options：

-nostdlib和-nodefaultlibs绕过的标准库之一是libgcc.a，GCC使用的内部子程序库克服特定机器的缺点，或特殊需求一些语言。（有关GCC输出的更多讨论，请参阅与GCC输出的接口） libgcc.a。）在大多数情况下，即使你想要，也需要libgcc.a 避免使用其他标准库。换句话说，当你指定 -nostdlib或-nodefaultlibs你通常也应该指定-lgcc。这可确保您没有未解析的内部GCC引用库子程序。

P.S。函数libgcc.a和ExitProcess来自SetUnhandledExceptionFilter，必须包含在链接器流中。您可以减少库，但不能省略系统和OS库。

编程没有依赖

1 个答案: