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RE: g++ libcygwin.a has an undefined reference
- From: "Al Slater" <al dot slater at scluk dot com>
- To: "'Christian Rudiger'" <christianruediger at gmx dot net>, <cygwin at cygwin dot com>
- Date: Tue, 18 May 2004 11:06:51 +0100
- Subject: RE: g++ libcygwin.a has an undefined reference
- Reply-to: cygwin at cygwin dot com
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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