CODEWITHSUNDEEP
c++g++cygwin
Styg
Styg

Reputation: 303

Multiple declaration error in g++ (cygwin)

I recently decided to start writing standards-compliant C++ instead of using Turbo-C++ and so I downloaded cygwin on windows 7 and installed g++. I tried to run a hello world program:

#include<iostream>

using namespace std;

int main()
{
    cout << "Hello World!" << endl;
    return 0;
}

and typed this in cygwin:

g++ test.cpp -o test
g++ test

Hoping I'd done alright, I pressed enter to find my heart broken by this giant wall of incomprehensible text:

$ g++ test.exe
test.exe: In function `mainCRTStartup':
/usr/src/debug/cygwin-1.7.27-2/winsup/cygwin/crt0.c:23: multiple definition of `mainCRTStartup'
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/../../../../lib/crt0.o:/usr/src/debug/cygwin-1.7.27-2/winsup/cygwin/crt0.c:23: first defined here
test.exe: In function `mainCRTStartup':
/usr/src/debug/cygwin-1.7.27-2/winsup/cygwin/crt0.c:23: multiple definition of `WinMainCRTStartup'
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/../../../../lib/crt0.o:/usr/src/debug/cygwin-1.7.27-2/winsup/cygwin/crt0.c:23: first defined here
test.exe:cygming-crtbegin.c:(.text+0x60): multiple definition of `__gcc_register_frame'
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/crtbegin.o:cygming-crtbegin.c:(.text+0x10): first defined here
test.exe:cygming-crtbegin.c:(.text+0xc0): multiple definition of `__gcc_deregister_frame'
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/crtbegin.o:cygming-crtbegin.c:(.text+0x70): first defined here
test.exe:crt0.c:(.text+0x50): multiple definition of `.weak._Jv_RegisterClasses.__gcc_register_frame'
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/crtbegin.o:cygming-crtbegin.c:(.text+0x0): first defined here
test.exe:cygming-crtend.c:(.idata+0x178): multiple definition of `__imp__ZSt4cout'
test.exe:cygming-crtend.c:(.idata+0x178): first defined here
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/crtbegin.o:cygming-crtbegin.c:(.text+0x35): undefined reference to `_Jv_RegisterClasses'
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/crtbegin.o:cygming-crtbegin.c:(.text+0x35): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `_Jv_RegisterClasses'
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/../../../../x86_64-pc-cygwin/bin/ld: /usr/lib/gcc/x86_64-pc-cygwin/4.8.2/crtbegin.o: bad reloc address 0x0 in section `.pdata'
collect2: error: ld returned 1 exit status

Could somebody please take a look at this and tell me what I'm doing wrong?

Upvotes: 0

Views: 2211

Answers (1)

yosim
yosim

Reputation: 503

No need for the g++ test command

the command g++ test.cpp -o test will compile and link your code. you can run it using ./test.exe

Upvotes: 3

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