removing libstdc (to check RPM dependencies)

anadem · 11-25-2008, 04:12 PM

Will

Code:

yum remove compat-libstdc++-33

undo what

Code:

yum install compat-libstdc++-33

did?

Explanation: I'm working on making an RPM package. Thanks to help from here it's basically working now. However I did a test install and got the message:

Code:

error: Failed dependencies:
    libstdc++.so.5 is needed by mypkg
    libstdc++.so.5(CXXABI_1.2) is needed by mypkg
    libstdc++.so.5(GLIBCPP_3.2) is needed by mypkg

So I installed the libs:

Code:

yum install compat-libstdc++-33

OK, all went fine, but now (in theory) the product no longer requires those libraries. So I want to test the rpm install again without those libraries installed. Will "yum remove blah" undo "yum install blah" or may there be bits left behind after the remove?

That is, do I need to re-image my machine to get back to a state of not having the libstdc++.so.5 installed?

Thanks

lazlow · 11-25-2008, 04:46 PM

Yes, the yum remove should work. But be careful. Sometime yum gets a little remove happy and decides to take half the system with it in order to remove one package. It will tell you what it (thinks) it has to remove along with the package you want to remove (just like it asks you when it installs extra dependencies). IF it decides to remove a bunch of extra stuff, tell it NO, and post back for other (more complex) removal methods.

colucix · 11-25-2008, 05:15 PM

Yes, yum asks confirmation before removing. If you see some additional package to be removed along with compat-libstdc++-33, just answer no. I don't think this is the case, anyway.

anadem · 11-25-2008, 05:40 PM

Thanks guys for the reassurance - I should have jumped in and not been so chicken! BUT

Code:

root@GP-D-227WS02 15:33 ~
# yum remove compat-libstdc++-33
Repository update already added, not adding again
Setting up Remove Process
No Packages marked for removal
root@GP-D-227WS02 15:33 ~

Any ideas what the secret sauce might be to "mark packages for removal" and have yum do what I need?

Thanks

lazlow · 11-25-2008, 05:49 PM

Run a "yum info compat-libstdc++-33" and see what it has to say. Here is mine for comparison:

[fred@localhost ~]$ yum info compat-libstdc++-33
Loaded plugins: priorities, protect-packages, protectbase
0 packages excluded due to repository protections
Installed Packages
Name : compat-libstdc++-33
Arch : x86_64
Version : 3.2.3
Release : 62
Size : 806 k
Repo : installed
Summary : Compatibility standard C++ libraries
URL : http://gcc.gnu.org
License : GPL
Description: The compat-libstdc++ package contains compatibility standard C++
: library from GCC 3.3.4.

Available Packages
Name : compat-libstdc++-33
Arch : i386
Version : 3.2.3
Release : 62
Size : 230 k
Repo : fedora
Summary : Compatibility standard C++ libraries
URL : http://gcc.gnu.org
License : GPL
Description: The compat-libstdc++ package contains compatibility standard C++
: library from GCC 3.3.4.

[fred@localhost ~]$

As you can see, it lists one installed and one available from the repo. Hopefully yours will not list one as being installed.

anadem · 11-25-2008, 06:13 PM

Thanks! That's strange, though! if I'm reading right, yum says libstdc++-33 is not installed now:

Reading repository metadata in from local files
base : ################################################## 1600/1600
update : ################################################## 209/209
Available Packages
Name : compat-libstdc++-33
Arch : i386
Version: 3.2.3
Release: 47.3
Size : 226 k
Repo : base
Summary: Compatibility standard C++ libraries

Name : compat-libstdc++-33
Arch : x86_64
Version: 3.2.3
Release: 47.3
Size : 224 k
Repo : base
Summary: Compatibility standard C++ libraries

I just checked history, and I definitely did "yum install" last week.

OOPS. DUH! History shows I also did "yum remove" last week. I can't believe how stupid I can be sometimes. AARRGH!

Many thanks for the help!

lazlow · 11-25-2008, 06:37 PM

If this is the stupidest mistake you make this week count yourself a hero. I drove all the way to Home Depot (holiday traffic already) just to realize I did not bring the part or part number I needed to get replaced. Lost well over an hour. In about the same time I probably could have walked there and back. It was the only reason for the trip.