Please, avoid top postings, this is hard to reply...
Christian Rudiger wrote:
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.
Strange? Every program needs starting point. For standard C(++) program it's called "main", usually in form "int main(int argc, char *argv[])".
There is of course exceptions. Windows programs use "WinMain" or DLL's use "DllMain" instead of plain "main".
Your example really need to instantiate class tryit and call instance method main before it really works.
Regards Christian Rudiger
Al Slater wrote:
Try putting a main function in the program!
Regards
Al
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Christian Rudiger
Sent: 18 May 2004 11:09
To: [EMAIL PROTECTED]
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 [EMAIL PROTECTED]'
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
-- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
-- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
-- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
