//Program snippet:

#include <iostream>

using namespace std;

int
main (int argc, char *argv[])
{
cout << "Hello world" << endl;
return 0;
}

Filename : test.cpp
Compilation string:
g++ -o test -Wall -pedantic test.cpp

Compilation Output:
test.cpp:1:20: iostream: No such file or directory
test.cpp: In function `int main(int, char**)':
test.cpp:8: error: `cout' was not declared in this scope
test.cpp:8: error: `endl' was not declared in this scope
test.cpp:8: warning: unused variable 'cout'
test.cpp:8: warning: unused variable 'endl'
w

gcc version:Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
Thread model: posix
gcc version 3.4.6 20060404 (Red Hat 3.4.6-3)

Observations:
the above mentioned program works fine with gcc version 4.1.2.

Why does it not get compiled with gcc 3.4.6 ? Any help is highly appreciated.

It looks like the C++ standard library for 3.4.6 isn't installed. How did you get this version of g++ - have you compiled it yourself, or is it from RPM?

Also, could you run g++ with the '-v' option and post the section that starts with '#include "..." search starts here:' and ends with 'End of search list'.

2 members found this post helpful.

Thanks for replying.
I have not installed gcc myself. But i would like to find out the cause behind this.
I ran the program again as you suggested. Please find the below output.

g++ -v -Wall -pedantic test.cpp
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
Thread model: posix
gcc version 3.4.6 20060404 (Red Hat 3.4.6-3)
/usr/libexec/gcc/i386-redhat-linux/3.4.6/cc1plus -quiet -v -D_GNU_SOURCE test.cpp -quiet -dumpbase test.cpp -auxbase test -Wall -pedantic -version -o /tmp/ccZrqH7Y.s
ignoring nonexistent directory "/usr/lib/gcc/i386-redhat-linux/3.4.6/../../../../include/c++/3.4.6"
ignoring nonexistent directory "/usr/lib/gcc/i386-redhat-linux/3.4.6/../../../../include/c++/3.4.6/i386-redhat-linux"
ignoring nonexistent directory "/usr/lib/gcc/i386-redhat-linux/3.4.6/../../../../include/c++/3.4.6/backward"
ignoring nonexistent directory "/usr/lib/gcc/i386-redhat-linux/3.4.6/../../../../i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib/gcc/i386-redhat-linux/3.4.6/include
/usr/include
End of search list.
GNU C++ version 3.4.6 20060404 (Red Hat 3.4.6-3) (i386-redhat-linux)
compiled by GNU C version 3.4.6 20060404 (Red Hat 3.4.6-3).
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
test.cpp:1:20: iostream: No such file or directory
test.cpp: In function `int main(int, char**)':
test.cpp:8: error: `cout' was not declared in this scope
test.cpp:8: error: `endl' was not declared in this scope
test.cpp:8: warning: unused variable 'cout'
test.cpp:8: warning: unused variable 'endl'

With a complete EL5 gcc34 / g++34 : compat-gcc-34-c++-3.4.6-4.1 /
compat-gcc-34-3.4.6-4.1 / compat-libstdc++-33-3.2.3

1) g++34 -v -Wall -pedantic test.cc -o hello
2) ./hello : No errors, replies : Hello world


Same conclusion as @JohnGraham : Install the right libstdc++.
Which is automatically installed by : # yum install compat-gcc-34-c++

.

1 members found this post helpful.

Thanks for your help. I am trying to understand what is happening here. I agree that C++ standard library for 3.4.6 isn't installed. I have checked it manually by going to that directory. There is no directory 3.4.6 in c++ folder.

What i have done now is that i compiled the above program on a server where C++ is installed and it works. However, when i move the binary ( or execuatable ) to this server ( where 3.4.6 is not installed ), and run it, it fails with "Floating point exception".

Is the program compiled with higher version of gcc(4.1.1), does not work with older version of gcc(3.4.6 [C++ std library is not installed] ) ?

Any light on this matter ?

These problems might be unrelated -- try and debug to floating point exception with gdb

Try installing build essentials.