I tried to compile a dll (wrote in c++) in DevCpp 4 in order to use this compiler instead of MS Visual Studio 6.0 and the compiler seems not to know the frstream class. The linker spats out:
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgtimer.o(.text+0x122):unitsgtimer.cp: undefined reference to timeGetTime@0'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x44c):unitsgfile.cpp: undefined reference tofstreambase::close(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x59e):unitsgfile.cpp: undefined reference to istream::tellg(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x5bf):unitsgfile.cpp: undefined reference toistream::tellg(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x751):unitsgfile.cpp: undefined reference to istream::read(char *, int)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x9c2):unitsgfile.cpp: undefined reference toistream::read(char *, int)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xbf7):unitsgfile.cpp: undefined reference to ostream::write(char const *, int)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xd69):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xd83):unitsgfile.cpp: undefined reference to ostream::seekp(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xefe):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xf13):unitsgfile.cpp: undefined reference to istream::tellg(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xf35):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xf7f):unitsgfile.cpp: undefined reference to istream::read(char *, int)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x105a):unitsgfile.cpp: undefined reference toostream::seekp(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x106f):unitsgfile.cpp: undefined reference to ostream::tellp(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1091):unitsgfile.cpp: undefined reference toostream::seekp(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x11db):unitsgfile.cpp: undefined reference to fstreambase::close(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1294):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x12a9):unitsgfile.cpp: undefined reference to istream::tellg(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x12cb):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1315):unitsgfile.cpp: undefined reference to istream::read(char *, int)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x13f0):unitsgfile.cpp: undefined reference toostream::seekp(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1405):unitsgfile.cpp: undefined reference to ostream::tellp(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1427):unitsgfile.cpp: undefined reference toostream::seekp(long, ios::seek_dir)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x161d):unitsgfile.cpp: undefined reference to fstreambase::close(void)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text$__7fstreami+0xaf):unitsgfile.cpp: undefined reference tofstreambase::fstreambase(int)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text$open__7fstreamPCcii+0x1a):unitsgfile.cpp: undefined reference to fstreambase::open(char const *, int, int)'
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text$_$_11fstreambase+0x60):unitsgfile.cpp: undefined reference tofilebuf::~filebuf(void)'
Warning: no export definition file provided
dllwrap will create one, but may not be what you want
d:\ARBEIT~1\devcpp\Bin\dllwrap: gcc exited with status 1
I didn't change any settings since the installation of DevCpp. What to do to solve this problem?
Samuel G.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Actually, you include fstream and then access fstream either by pre-qualifying the std namespace or through it, using std::fstream.
fstream.h is a deprecated header that existed in the pre-standard days. There is no inherent benefit of using fstream.h over fstream, and for standards sake fstream is a much better option.
Benjamin Lau
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Maybe I erred, when I thought I solved the problem. I now changed my include directive to
include <fstream>
// .....
using namespace std;
as you said, but the same linker errors occur as listed above. Why is the definition of fstream not found? The declaration seems to be well known to the compiler (this means: the header include is the correct one(?)). Where are the definitions of the standard library functions and classes normally?
Hoping for help
Samuel G.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
I tried to compile a dll (wrote in c++) in DevCpp 4 in order to use this compiler instead of MS Visual Studio 6.0 and the compiler seems not to know the frstream class. The linker spats out:
e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgtimer.o(.text+0x122):unitsgtimer.cp: undefined reference to
timeGetTime@0' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x44c):unitsgfile.cpp: undefined reference tofstreambase::close(void)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x59e):unitsgfile.cpp: undefined reference to
istream::tellg(void)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x5bf):unitsgfile.cpp: undefined reference toistream::tellg(void)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x751):unitsgfile.cpp: undefined reference to
istream::read(char *, int)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x9c2):unitsgfile.cpp: undefined reference toistream::read(char *, int)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xbf7):unitsgfile.cpp: undefined reference to
ostream::write(char const *, int)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xd69):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xd83):unitsgfile.cpp: undefined reference to
ostream::seekp(long, ios::seek_dir)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xefe):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xf13):unitsgfile.cpp: undefined reference to
istream::tellg(void)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xf35):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0xf7f):unitsgfile.cpp: undefined reference to
istream::read(char *, int)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x105a):unitsgfile.cpp: undefined reference toostream::seekp(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x106f):unitsgfile.cpp: undefined reference to
ostream::tellp(void)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1091):unitsgfile.cpp: undefined reference toostream::seekp(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x11db):unitsgfile.cpp: undefined reference to
fstreambase::close(void)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1294):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x12a9):unitsgfile.cpp: undefined reference to
istream::tellg(void)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x12cb):unitsgfile.cpp: undefined reference toistream::seekg(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1315):unitsgfile.cpp: undefined reference to
istream::read(char *, int)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x13f0):unitsgfile.cpp: undefined reference toostream::seekp(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1405):unitsgfile.cpp: undefined reference to
ostream::tellp(void)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x1427):unitsgfile.cpp: undefined reference toostream::seekp(long, ios::seek_dir)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text+0x161d):unitsgfile.cpp: undefined reference to
fstreambase::close(void)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text$__7fstreami+0xaf):unitsgfile.cpp: undefined reference tofstreambase::fstreambase(int)'e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text$open__7fstreamPCcii+0x1a):unitsgfile.cpp: undefined reference to
fstreambase::open(char const *, int, int)' e:\samuel\programmierung\c++\visualc++\dll's\sgcommon4mitdevcpp\unitsgfile.o(.text$_$_11fstreambase+0x60):unitsgfile.cpp: undefined reference tofilebuf::~filebuf(void)'Warning: no export definition file provided
dllwrap will create one, but may not be what you want
d:\ARBEIT~1\devcpp\Bin\dllwrap: gcc exited with status 1
I didn't change any settings since the installation of DevCpp. What to do to solve this problem?
Samuel G.
jes, the path is a bit unclear, but yes, I use DevCpp.
Samuel G.
Is nobody able to help me? Some additional information needed?
Samuel G.
I got it!
You have to include
<fstream.h> in DevCpp to use class fstream,
other than in MS Visual C++ 6.0. In MS Visual C++ 6.0 you only have to include <iostream.h>!
Actually, you include fstream and then access fstream either by pre-qualifying the std namespace or through it, using std::fstream.
fstream.h is a deprecated header that existed in the pre-standard days. There is no inherent benefit of using fstream.h over fstream, and for standards sake fstream is a much better option.
Benjamin Lau
Yeah, you need to #include <fstream> when compiling with g++ if you want to use ifstream, ofstream, etc...
In other words:
include <fstream>
// .....
using namespace std;
Maybe I erred, when I thought I solved the problem. I now changed my include directive to
include <fstream>
// .....
using namespace std;
as you said, but the same linker errors occur as listed above. Why is the definition of fstream not found? The declaration seems to be well known to the compiler (this means: the header include is the correct one(?)). Where are the definitions of the standard library functions and classes normally?
Hoping for help
Samuel G.
Uhh... the paths in your log start with "e:\samuel\programmierung\c++\visualc++..." Are you sure you are using Dev-C++ and not Visual C++?
qWake