CODEWITHSUNDEEP
c++eclipseeclipse-cdtiostream
BharathYes
BharathYes

Reputation: 1037

What causes the Eclipse CDT Unresolved inclusion: <iostream>

Just installed the latest Eclipse IDE and am following the included C++ User Guide right from 'Before you begin' section.

The simple application was successfully completed but once I got to the makefile project and the C++ file tutorials, I got the "Unresolved inclusion: <iostream>" error and a bunch of others related to "cout, cin, endl" because of it.

I followed the tutorials exactly as instructed and am not sure why this occurred. I have since corrected it by following this answer, but now want to know why this happens, especially since I am following the official tutorial and do I have to add the C++ include path for every project on Eclipse?

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Upvotes: 2

Views: 1744

Answers (2)

Peng Zup
Peng Zup

Reputation: 1

I've searched for a few hours and tried a lot solutions.

Envirment: windows, Eclipse IDE for C/C++ Developers

Version: Kepler Service Release 2

CDT: 8.3.0

Following steps works for me:

make sure the envirement is clear. => I suggest delete the eclipse and unzip it again from your orginal download. Remove all variable relatated to eclipse and MinGW you set to PATH of envirment variables.

make sure the workspace is clear. => Delete .metadata folder in your workspace folder.

use valid MinGW. => the one using download tool is slow and I'm not sure which one to select. I suggest download MinGWStudio which contains an unzip MinGW from http://vaultec.mbnet.fi/mingwstudio.php This is a IDE tool like eclipse contains a downloaded unzip MinGW. Make sure you download the one plus MinGW compiler which is about 20M. You can use this studio if you want or copy the MinGW folder to C:/ if you still prefer eclipse. Copy /MinGW inside /MinGWStudio to C:/.

close your eclipse and reopen it, create a new project, you should able to see MinGW section for new project option, and it will auto map g++, gcc and include files under C:/MinGW folder. Just make sure you copy MinGW folder from MinGWStudio to the root of C:/.

You will able to see your include after these steps. Build your project, everything should goes well even there may some warning hint.

enter image description here

Hope it helps.

Upvotes: 0

HighCommander4
HighCommander4

Reputation: 52749

That first error in the screenshot linked in the comments provides a clue to the problem.

If you go to the preference page mentioned in the error's "Location", you'll see that there is a field called "Command to get compiler specs" with the contents something like:

${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"

This is a command that Eclipse tries to run to get your compiler to output its built-in include paths and other similar information.

The fact that you're getting the error Program "-E" not found in PATH suggests that the variables ${COMMAND} and ${FLAGS} are evaluating to empty strings, so that the first actual token in the command (which the shell then tries to interpret as the program name) is -E.

I'm not sure why those variables are evaluating to empty, but you should be able to work around the issue by replacing ${COMMAND} with g++ (presumably g++ is in your PATH).

Upvotes: 1

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