problems with g++ compiling
 

Hi all,

I have a problem compiling c++ programs using g++. I have installed gcc 3.4.3-9EL4 on a red hat 2.6.9-5.ELsmp.
When trying to compile the simple 'helloworld.cpp' I get error messages for every line.
the problems appeared after I tried to install two different versions of gcc (did not work, and now nothing works when compiling c++)

g++ hello.cpp

hello.cpp:1:19: iostream: No such file or directory
hello.cpp: In function `int main()':
hello.cpp:7: error: `cout' undeclared (first use this function)
hello.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)


it looks like c++ code is not recognized properly.
I have tried to install gcc again (3.4.3), configuration works, but when typing 'make' I get the following error message:

if [ -f stmp-dirs ]; then true; else touch stmp-dirs; fi
/home/klaus/Desktop/gcc-3.4.3/gcc/xgcc -B/home/klaus/Desktop/gcc-3.4.3/gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/x86_64-unknown-linux-gnu/include -isystem /usr/local/x86_64-unknown-linux-gnu/sys-include -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -isystem ./include -fPIC -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -shared -nodefaultlibs -Wl,--soname=libgcc_s.so.1 -Wl,--version-script=libgcc/32/libgcc.map -o 32/libgcc_s.so.1.tmp -m32 libgcc/32/_muldi3.o libgcc/32/_negdi2.o libgcc/32/_lshrdi3.o libgcc/32/_ashldi3.o libgcc/32/_ashrdi3.o libgcc/32/_cmpdi2.o libgcc/32/_ucmpdi2.o libgcc/32/_floatdidf.o libgcc/32/_floatdisf.o libgcc/32/_fixunsdfsi.o libgcc/32/_fixunssfsi.o libgcc/32/_fixunsdfdi.o libgcc/32/_fixdfdi.o libgcc/32/_fixunssfdi.o libgcc/32/_fixsfdi.o libgcc/32/_fixxfdi.o libgcc/32/_fixunsxfdi.o libgcc/32/_floatdixf.o libgcc/32/_fixunsxfsi.o libgcc/32/_fixtfdi.o libgcc/32/_fixunstfdi.o libgcc/32/_floatditf.o libgcc/32/_clear_cache.o libgcc/32/_enable_execute_stack.o libgcc/32/_trampoline.o libgcc/32/__main.o libgcc/32/_absvsi2.o libgcc/32/_absvdi2.o libgcc/32/_addvsi3.o libgcc/32/_addvdi3.o libgcc/32/_subvsi3.o libgcc/32/_subvdi3.o libgcc/32/_mulvsi3.o libgcc/32/_mulvdi3.o libgcc/32/_negvsi2.o libgcc/32/_negvdi2.o libgcc/32/_ctors.o libgcc/32/_ffssi2.o libgcc/32/_ffsdi2.o libgcc/32/_clz.o libgcc/32/_clzsi2.o libgcc/32/_clzdi2.o libgcc/32/_ctzsi2.o libgcc/32/_ctzdi2.o libgcc/32/_popcount_tab.o libgcc/32/_popcountsi2.o libgcc/32/_popcountdi2.o libgcc/32/_paritysi2.o libgcc/32/_paritydi2.o libgcc/32/_divdi3.o libgcc/32/_moddi3.o libgcc/32/_udivdi3.o libgcc/32/_umoddi3.o libgcc/32/_udiv_w_sdiv.o libgcc/32/_udivmoddi4.o libgcc/32/unwind-dw2.o libgcc/32/unwind-dw2-fde-glibc.o libgcc/32/unwind-sjlj.o libgcc/32/gthr-gnat.o libgcc/32/unwind-c.o -lc && rm -f libgcc_s_32.so && if [ -f 32/libgcc_s.so.1 ]; then mv -f 32/libgcc_s.so.1 32/libgcc_s.so.1.`basename `; else true; fi && mv 32/libgcc_s.so.1.tmp 32/libgcc_s.so.1 && ln -s 32/libgcc_s.so.1 libgcc_s_32.so
/usr/bin/ld: crti.o: No such file: No such file or directory
collect2: ld returned 1 exit status
make[2]: *** [32/libgcc_s_32.so] Error 1
make[2]: Leaving directory `/home/klaus/Desktop/gcc-3.4.3/gcc'
make[1]: *** [stmp-multilib] Error 2
make[1]: Leaving directory `/home/klaus/Desktop/gcc-3.4.3/gcc'
make: *** [all-gcc] Error 2

... since I am also quite new in Linux, I don't really know what to do...


thanks in advance,
klaus

Removed. Just understood question.

Post your hello world code. It should look something like:

#include <iostream>

int main()
{
using namespace std;
cout << "Hello World" << endl;

return 0;
}

The error you are getting is usually indicative of forgetting to put in the "using namespace std" line.

Where is the source? It's not possible to say where the error lies without seeing the code. And it's very likely you are making a coding error.

This program should compile and run successfully:

Create a file named "program.cpp" from the above, then do this:

hi,

thank you all in advance!

I have a helloworld file like

#include<iostream>

using namespace std;

int main()
{
cout<<"hello world";

}

Generally, I can not compile any c++ program, I just wanted to test it with a simple one.

if I do:
[klaus@ICHE198 ~/Desktop]$ make programm %%as suggested
g++ programm.cpp -o programm
programm.cpp:1: error: expected constructor, destructor, or type conversion before '<' token
programm.cpp:1: error: expected `,' or `;' before '<' token
make: *** [programm] Error 1

A friend told me, if nothing works with c++, I should remove gcc. Do you know, how I can do that? I did not install it with rpm...

thank you for your suggestions!
klaus

Syntax error: There must be a space between "#include" and "<iostream>".

Syntax error: There must be spaces between "cout" and "<<", and "<<" and "hello world".

If you will fix your syntax errors and follow standard coding practices, chances are your program will compile and run.

I emphasize these are issues that should be addressed, they aren't necessarily the cause of your present problems.

How did you install it? If you installed it using yum or apt-get, uninstall it the same way, then reinstall it -- in fact, an uninstall/reinstall cycle is likely to solve the problems.

That is just the compiler. It does not include the headers and libraries you need for actually compiling anything useful. Those are in other packages.

I'm not at a Centos system now to check the name of the overall package that will install the header and library packages you need.

In another thread at LQ, talking about a different distribution, I just saw someone say that package is build-essential. That might be correct an might apply to Red Hat as well.

Alternately, as you discover individual files missing, such as iostream, you can switch to root and give the yum command to find out what package that file is in:
Then install that package. Then retest and see what else is still missing.

hi again,

thanks for your suggestions. I corrected the helloworld, but errors stayed the same.
Well, when the red hat was installed, 'we' put the gcc also there. It looks like it is installed via rpm, doesnt it?:

[klaus@ICHE198 ~]$ rpm -q gcc
gcc-3.4.3-9.EL4

I removed the gcc package via --nodeps
Now gcc is removed, I can not find it anymore, but looks like g++ is still there?:

[root@ICHE198 klaus]# gcc
bash: gcc: command not found
[root@ICHE198 klaus]# g++
g++: no input files
[root@ICHE198 klaus]#


[root@ICHE198 Desktop]# rpm -q gcc
package gcc is not installed
[root@ICHE198 Desktop]# rpm -q g++*
package g++* is not installed
[root@ICHE198 Desktop]#

g++ yields the same errors as before. Should I just install a new gcc now?

thanks in advance,
klaus

'gcc' should not be removed !

# yum provides */iostream

# yum install gcc-c++
.. will do.

'gcc-c++' provides /usr/include/c++/3.x.x/iostream .
.....

I tried on a Centos system. It looks to me like
libstdc++ provides /usr/include/c++/VariousVersions/iostream

I'm not exactly an expert in Yum. But I can't see how gcc-c++ provides iostream.

If the OP removed gcc-c++, he should certainly reinstall it. But I'm not convinced that is enough.

I suggest

He's on RHEL4, not RHEL5. yum doesn't exist.

OP, do the following:

I guess someone added Yum to the two RHEL4 systems I occasionally use, because it works for me.

I've never installed any RHEL system, (just Centos 5.1 and 5.3) and I'm not involved in maintaining those RHEL4 systems. So I have no real guess how far they have diverged from normal RHEL4. At some point soon they will be reinstalled as Centos.

Hydrazin, post the output of:

$ rpm -qa | grep gcc

that should list all the packages installed with gcc in their name. Typically, you should have gcc itself, a preprocessor package having "gcc-cpp" in the package name, a libgcc package and for c++ support, a gcc-c++ package. In most distros, it's not possible to have g++ installed without the supporting c++ standard libraries, i.e. they're included in the gcc-c++ package. At least that's the case in mandriva but RH may package differently.

hi all again,

as written, I removed the gcc...
if I do the up2date command, I get some error
(Error Class Code: 70
Error Class Info:
All available subscriptions for the requested channel have been exhausted.
Please contact a Red Hat Network Sales associate.
Explanation:
An error has occurred while processing your request. If this problem
persists please enter a bug report at bugzilla.redhat.com.
If you choose to submit the bug report, please be sure to include
details of what you were trying to do when this error occurred and
details on how to reproduce this problem.)

I think the system is now to old and there is no service included anymore?
I tried the following (hopefully harmless) procedure:

but now, with the missing libgcc

... and now I don't really know...
thanks again for your help, as you see, I don't really know what i am doing when installing these libraries...

thanx
klaus

sorry, i did not see the last post before mine,

wow?!
but still, I got

I think I have got to learn a lot in this world of linux :study: