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From:	"Al Slater" <al DOT slater AT scluk DOT com>
To:	"'Christian Rudiger'" <christianruediger AT gmx DOT net>, <cygwin AT cygwin DOT com>
Subject:	RE: g++ libcygwin.a has an undefined reference
Date:	Tue, 18 May 2004 11:06:51 +0100
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Try putting a main function in the program!

Regards

Al

> -----Original Message-----
> From: cygwin-owner AT cygwin DOT com 
> [mailto:cygwin-owner AT cygwin DOT com] On Behalf Of Christian Rudiger
> Sent: 18 May 2004 11:09
> To: cygwin AT cygwin DOT com
> Subject: g++ libcygwin.a has an undefined reference
> 
> 
> Hello there,
> 
> i think the following problem has to do with cygwin, cause 
> libcygwin.a 
> has an undefined reference.
> I get the error message when compiling my little testprogram. 
> The Programm and complete compiler messages follow:
> 
> *************************************************************
> 
> // reading a text file
> #include <iostream.h>
> #include <fstream.h>
> #include <stdlib.h>
> #include <string.h>
> 
> using namespace std;
> 
> class tryit {
> 
>    char *FILE_POSTFIX;// = new "myfile.txt"; <- ausserhalb 
> nicht möglich
>    string posti;
> public:
>    int main (int argc, char** argv) {
> 
>      FILE_POSTFIX = new char[10]; //"Nodes.txt"; <- erst 
> allocieren dann 
> zuweisen !
>      FILE_POSTFIX = "NODES.txt";
>      char *filename = FILE_POSTFIX;
>      char *output;
>      ifstream in (filename) ;
>      while (in){
>      in >> output ;
>      cout << output << endl;
>      return 0;
>        }
>    }
> };
> 
> *************************************************************
> 
> g++ -v -Wall -Wno-deprecated tryme.cpp -o testthings.exe
> Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/specs
> Configured with: /GCC/gcc-3.3.1-3/configure --with-gcc --with-gnu-ld 
> --with-gnu-as --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc 
> --libdir=/usr/lib --libexecdir=/usr/sbin --mandir=/usr/share/man 
> --infodir=/usr/share/info 
> --enable-languages=c,ada,c++,f77,pascal,java,objc --enable-libgcj 
> --enable-threads=posix --with-system-zlib --enable-nls 
> --without-included-gettext --enable-interpreter 
> --enable-sjlj-exceptions 
> --disable-version-specific-runtime-libs --enable-shared 
> --disable-win32-registry --enable-java-gc=boehm 
> --disable-hash-synchronization --verbose --target=i686-pc-cygwin 
> --host=i686-pc-cygwin --build=i686-pc-cygwin
> Thread model: posix
> gcc version 3.3.1 (cygming special)
>   /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/cc1plus.exe -quiet -v 
> -D__GNUC__=3 -D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=1 
> -D__CYGWIN32__ 
> -D__CYGWIN__ -Dunix -D__unix__ -D__unix -idirafter 
> /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../../../include/w32api 
> -idirafter 
> /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../../../i686-pc-cygw
in/lib/../../include/w32api 
> tryme.cpp -D__GNUG__=3 -quiet -dumpbase tryme.cpp -auxbase 
> tryme -Wall 
> -Wno-deprecated -version -o /cygdrive/d/TMP/cc55YaOO.s
> GNU C++ version 3.3.1 (cygming special) (i686-pc-cygwin)
> 	compiled by GNU C version 3.3.1 (cygming special).
> GGC heuristics: --param ggc-min-expand=47 --param 
> ggc-min-heapsize=32700 ignoring nonexistent directory 
> "/usr/local/include" ignoring nonexistent directory 
> "/usr/i686-pc-cygwin/include" ignoring duplicate directory 
> "/usr/i686-pc-cygwin/lib/../../include/w32api"
> #include "..." search starts here:
> #include <...> search starts here:
>   /usr/include/c++/3.3.1
>   /usr/include/c++/3.3.1/i686-pc-cygwin
>   /usr/include/c++/3.3.1/backward
>   /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/include
>   /usr/include
>   /usr/include/w32api
> End of search list.
>  
> /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../../../i686-pc-cygw
in/bin/as.exe 
> --traditional-format -o /cygdrive/d/TMP/ccbPwKZW.o 
> /cygdrive/d/TMP/cc55YaOO.s
>   /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/collect2.exe -Bdynamic 
> --dll-search-prefix=cyg -o testthings.exe 
> /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../../crt0.o 
> /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/crtbegin.o 
> -L/usr/lib/gcc-lib/i686-pc-cygwin/3.3.1 
> -L/usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../.. 
> /cygdrive/d/TMP/ccbPwKZW.o -lstdc++ -lgcc -lcygwin -luser32 
> -lkernel32 
> -ladvapi32 -lshell32 -lgcc 
> /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/crtend.o
> /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../../libcygwin.a(lib
> cmain.o)(.text+0x7c): 
> undefined reference to `_WinMain AT 16'
> collect2: ld returned 1 exit status
> make: *** [testthings.exe] Error 1
> 
> Compilation exited abnormally with code 2 at Tue May 18 11:05:17
> 
> 
> Regards Christian Rudiger
> 
> 
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