g++ libcygwin.a has an undefined reference

[Christian Rudiger]

Hello Al,

thank you, it worked.
i putted one at the end of the program just writing :

}; // end of class
int main(){}

why does that work? I think thats strange.

Regards Christian Rudiger

Al Slater wrote:

> Try putting a main function in the program!
> 
> Regards
> 
> Al
> 
> 
>>-----Original Message-----
>>From: cygwin-owner@cygwin.com 
>>[mailto:cygwin-owner@cygwin.com] On Behalf Of Christian Rudiger
>>Sent: 18 May 2004 11:09
>>To: cygwin@cygwin.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@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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> 
> 
> 


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