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Build failure on stock "C++ Hello World" project [message #838350]

Fri, 06 April 2012 20:03

Eclipse User

I'm no stranger to building C++ code on Linux, but as part of setting up a dev environment on a VM at home, I installed Eclipse with CDT and expected the standard 'C++ Hello World' to succeed as a standard verification of a working environment... but it doesn't.

I get numerous failures for missing type definitions in the system header files (most stemming from the 'cout' call), and so went looking for the settings which determine default include paths; eventually I found them in a file with the 'sc' filetype, under the .metadata/.plugins subdirectory for the cdt core make values. This is not documented anywhere that I can find, but I'm guessing that it is created by the automatic path discovery feature.

Before I just discard this and go through the process of setting everything up by hand, is this problem experienced by anyone else? If it turns out to be something I've overlooked, I won't mind in the slightest. Smile

Thanks-

Bob

Re: Build failure on stock "C++ Hello World" project [message #840591 is a reply to message #838350]

Tue, 10 April 2012 05:20

Eclipse User

You are right . The sc file is created by the automatic include path discovery. You should not edit it manually.
Does the folder "Includes" in your Project Explorer contain all the system headers? Can you select e.g. io.h in your source file and pressing F3 will open the correct system header? Did you rebuild the index (Project properties->Index)?

Re: Build failure on stock "C++ Hello World" project [message #840866 is a reply to message #840591]

Tue, 10 April 2012 11:46

Eclipse User

Thanks, Axel.

I'm guessing that the path discovery result was not accurate, as the initial build produced close to 600 errors stemming from inclusion of the iostream header, which couldn't locate a large number of system-defined symbols/classes.

I've rebuilt the index repeatedly, after adding various system directories to the include directories via the Project Properties dialog.

At this point, I'm going to create a new VM, and add as little as possible to it before doing a test build of CDT. This is because I ended up with both 4.4.4 and 4.4.6 versions of the c++ include directories, and the 4.4.6 is nothing more than a soft link to the 4.4.4 version... which makes me wonder about the relative paths that I find in the .sc file. (Relative paths including '..' don't play well with soft links.)

The reason I'm going to try this is that I added a number of packages that I prefer to work with, and one of those might have been the reason the soft link was added. If I get solid information from this experiment on what's wrong with the environment, I'll try fixing my existing VM as a proof that I've got the right root cause identification.

I'll update this thread once I have the results of that experiment. I am intending to join the contributor list for CDT anyway, so perhaps I'll be in the position of reporting a bug and resolving it myself. Smile

Thanks again-

Bob

Re: Build failure on stock "C++ Hello World" project [message #841162 is a reply to message #840866]

Tue, 10 April 2012 21:07

Eclipse User

OK. This time I did not download and install the preset Eclipse C++ package set, but instead just included Eclipse (Helios) in the initial VM configuration, and added the CDT plugin afterwards.

Everything worked fine for the 'Hello World' compilation and execution, so apparently I hit a corner case somehow, probably related to the order of installation of some rpm that caused an issue with the path discovery.

Thanks again for the reply, Axel.

Bob

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