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To:	cygwin AT cygwin DOT com
From:	Christian Rudiger <christianruediger AT gmx DOT net>
Subject:	g++ libcygwin.a has an undefined reference
Date:	Tue, 18 May 2004 11:08:36 +0100
Lines:	99
Message-ID:	<c8cn3t$21u$1@sea.gmane.org>
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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-cygwin/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-cygwin/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(libcmain.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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