Linux C++ Help

["Jayanta Narayan Choudhuri" <sss at cal dot vsnl dot net dot in>]

Title: Message

I am seeking your help ONLY after exhausting myself!

 

If you can help me get "g++ -o x.exe gplus.cpp" to link & work then rest will hopefully follow.

 

I assumed that it will be easy to port STL C++ programs from Win32 to Linux.

 

However after spending 36 hours I am stuck only in the last stage - linking.

 

1. gcc or g++ automatically sense the include directories to search and libraries to link(perhaps) depending on extension *.cpp or *.c

2. If you write a pure K&R C program or a pure C++ program(not using old C stuff) there is no problem.

3. The problem is with C++ programs that also call stdio & strings & ctype stuff. Compilation goes through fine but linking(collect2) fails. Also pure C++ STL programs call C malloc & free and even if I get rid of all K&R C stuff the linking fails.

4. I read all the internet HOW TO files and FAQs etc. but am in square one.

5. There must be something VERY silly I have missed.

 

I am attaching a few files that you can easily use to replicate my problem.

 

1. gcc -o x.exe jnc.c                       # WORKS

2. gcc -o x.exe jnc.cpp                        # FAILS even though jnc.c & jnc.cpp are identical

3. g++ -o x.exe jnc.cpp                        # also FAILS

4. g++ -o x.exe gplus.cpp                # also fails though I used the recommended headers of C++

5. g++ -x c -o x.exe jnc.cpp                 # WORKS

 

I edited out all the K&R C stuff like fprintf/sprintf/toupper etc. from my main STL project. As usual compilation is perfect but collect2 still fails and cannot link pthread_mutex_lock, pthread_mutex_unlock, malloc and free.  I wrote a few NON STL C++ programs, which if bereft of C calls, work fine. STL must be calling the above traditional stuff to allocate memory and be thread safe and possible that is why it fails.

 

jnc_linux.txt which has the main diagnostic output is also attached.

 

You can imagine my frustration. Everything compiling perfectly - this itself took quite a bit of effort. Yet I am stuck because I do not know how to link. If you can help me get "g++ -o x.exe gplus.cpp" to work then the rest will hopefully follow.

 

Looking forward to good news ....

 

Regards & Best Wishes

-jnc

 

Jayanta Narayan Choudhuri
Flat 302, 395 Jodhpur Park
Kolkata 700 068
India
Tel: 91(33)2473-1891
mailto:sss@cal.vsnl.net.in
url: http://www.geocities.com/ojnc

 

Attachment: gplus.cpp
Description: Text document

Attachment: jnc.c
Description: Text document

Attachment: jnc.cpp
Description: Text document

Attachment: jnc_linux.txt
Description: Text document