Eclipse CDT Symbol cout could not be resolved

Question

The error is as above  I have what should be all the necessary files include in the eclipse project    usr include c   4 6  usr include  usr include linux  usr local include   etc    I tried std  cout and using namespace std  cout but it still says unresolved    I have imported iostream and cstdlib   Also  I m on Ubuntu 12 04 with eclipse 3 7 2   Code snippet    include  lt cstdio gt   include  lt cstdlib gt   include  lt cstring gt   include  lt iostream gt   include  XPLMDisplay h   include  XPLMGraphics h   int XPluginStart char   outName   char   outSig   char   outDesc                      std  cout  lt  lt   test   lt  lt  std  endl                    using namespace std     UPDATE  I had created the eclipse project from existing code  Creating a new c   project fixes it  I ll accept an answer that explains what setting in the existing project could cause this  so I don t have to cut  amp  paste all my projects

User · Answer

If all else fails  like it did in my case  then just disable annotations  I started a c  11 project with own makefile but couldn t fix all the problems  Even if you disable annotations  eclipse will still be able to help you do some autocompletion  Most importantly  the debugger still works

User · Answer

I simply delete all error in the buttom  problem list  then close project and reopen project clean project build all run  then those stupids errors go

User · Answer

I had this happen after updating gcc and eclipse on ArchLinux  What solved it for me was Project - gt  C C   Index - gt  Rebuild

User · Answer

To get rid of symbol warnings you don t want  first you should understand how Eclipse CDT normally comes up with unknown symbol warnings in the first place  This is its process  more or less    Eclipse detects the GCC toolchains available on the system Your Eclipse project is configured to use a particular toolchain Eclipse does discovery on the toolchain to find its include paths and built-in defines  i e  by running it with relevant options and reading the output Eclipse reads the header files from the include paths Eclipse indexes the source code in your project Eclipse shows warnings about unresolved symbols in the editor   It might be better in the long run to fix problems with the earlier steps rather than to override their results by manually adding include directories  symbols  etc   Toolchains  If you have GCC installed  and Eclipse has detected it  it should list that GCC as a toolchain choice that a new C   project could use  which will also show up in Window - gt  Preferences - gt  C C   - gt  New CDT Project Wizard on the Preferred Toolchains tab s Toolchains box on the right side  If it s not showing up  see the CDT FAQ s answer about compilers that need special environments  as well as MinGW and Cygwin answers for the Windows folk    If you have an existing Eclipse C   project  you can change the associated toolchain by opening the project properties  and going to C C   Build - gt  Tool Chain Editor and choosing the toolchain you want from the Current toolchain  pulldown    You ll have to uncheck the Display compatible toolchains only box first if the toolchain you want is different enough from the one that was previously set in the project    If you added a toolchain to the system after launching Eclipse  you will need to restart it for it to detect the toolchain   Discovery  Then  if the project s C C   Build - gt  Discovery Options - gt  Discovery profiles scope is set to Per Language  during the next build the new toolchain associated with the project will be used for auto-discovery of include paths and symbols  and will be used to update the  built-in  paths and symbols that show up in the project s C C   General - gt  Paths and Symbols in the Includes and Symbols tabs   Indexing  Sometimes you need to re-index again after setting the toolchain and doing a build to get the old symbol warnings to go away  right-click on the project folder and go to Index - gt  Rebuild to do it    tested with Eclipse 3 7 2   CDT 8

User · Answer

I had a similar problem with  std  shared ptr  with Eclipse using MinGW and gcc 4 8 1  No matter what  Eclipse would not resolve  shared ptr   To fix this  I manually added the   cplusplus macro to the C   symbols and - viola  - Eclipse can find it  Since I specified -std c  11 as a compile option  I  ahem  assumed that the Eclipse code analyzer would use that option as well  So  to fix this    Project Context -  C C   General -  Paths and Symbols -  Symbols Tab Select C   in the Languages panel  Add symbol   cplusplus with a value of 201103    The only problem with this is that gcc will complain that the symbol is already defined    but the compile will complete as before

User · Answer

You guys are looking under the wrong section  I realized the difference when I installed in Linux after recently getting frustrated with Windows and the difference was immediately apparent   In the new setup I have an includes folder in a projected that I created out of existing source   I can expand this and see a ton of includes  however  I cannot add to them  This lead me to a hunt for where these files were being listed   They re listed under the Project Properties   C C   General   Preprocessor Includes   GNU C   CDT GCC Built-in Compiler Settings  Shared  Under that is a ton of includes   These settings are set by the toolchain you ve selected

User · Answer

Just adding yet another bit of advice after trying a bunch of stuff myself and it not working      I had GCC installed and the path to the includes set correctly  Had the std error as well  and couldn t get anything working for cout  and I suspect anything in the SL      Took me awhile to realize that g   wasn t installed - gcc was but not g    So just do   sudo apt-get install g    Restart eclipse  Assuming above mentioned details about gcc  amp  paths to includes are fine  you should be okay now

User · Answer

I tried the marked solution here first  It worked but it is kind hacky  and you need to redo it every time you update the gcc  I finally find a better solution by doing the followings    Project -  Properties -  C C   General -  Preprocessor Include Paths  Macros  etc  Providers -  CDT GCC built-in compiler settings Uncheck Use global provider shared between projects  you can also modify the global provider if it fits your need  In Command to get compiler specs  add -std c  11 at the end Index- Rebuild   Voila  easy and simple  Hopefully this helps   Note  I am on Kepler  I am not sure if this works on earlier Eclipse

User · Answer

For me it helped to enable the automated discovery in Properties -  C C  -Build -  Discovery Options to resolve this problem

User · Answer

I had the same issue using Eclipse CDT  Kepler  on Windows with Cygwin installed  After pointing the project properties at every Cygwin include I could think of  it still couldn t find cout    The final missing piece turned out to be C cygwin64 lib gcc x86 64-pc-cygwin 4 8 2 install-tool include   To sum up    Right click on the project Choose Properties Navigate to C C   General   Paths and Symbols   Includes tab Click Add    Click File system    Browse to the location of your Cygwin lib gcc x86 64-pc-cygwin 4 8 2 install-tool include Click OK   Here is what my project includes ended up looking like when it was all said and done

User · Answer

mine was bit easy to fig out  right click  run as run configration  check boxes include system lib inherited mains

User · Answer

Most likely you have some system-specific include directories missing in your settings which makes it impossible for indexer to correctly parse iostream  thus the errors  Selecting Index - gt  Search For Unresolved Includes in the context menu of the project will give you the list of unresolved includes which you can search in  usr include and add containing directories to C   Include Paths and Symbols in Project Properties   On my system I had to add  usr include c   4 6 x86 64-linux-gnu for bits c  config h to be resolved and a few more directories   Don t forget to rebuild the index  Index -  Rebuild  after adding include directories

User · Answer

Thanks loads for the answers above   I m adding an answer for a specific use-case     On a project with two target architectures each with its own build configuration  the main target is an embedded AVR platform  the second target is my local Linux PC for running unit tests  I found it necessary to set Preferences - gt  C C   - gt  Indexer - gt  Use active build configuration as well as to add  usr include c   4 7   usr include and  usr include c   4 7 x86 64-linux-gnu to Project Properties - gt  C C   General - gt  Paths and Symbols and then to rebuild the index

User · Answer

I am using Ubuntu 12 04   Eclipse 4 2 1   CDT 8 1 1 and I used to have the same problem for quite some time  importing a C   project from SVN would cause these annoying  Unresolved inclusion  errors and I would instead have to create a new project and copy the files in there as a work-around  still partial  since SVN functionality would not be there     At last  I have just found a simple  satisfactory solution    Go to Project - gt  Properties - gt  C C   General - gt  Preprocessor Include Paths  Macros etc  - gt  Providers and check Enable language settings providers for this project  Restart Eclipse    Hopefully that already does the trick

User · Answer

I have created the Makefile project using cmake on Ubuntu 16 04   When created the eclipse project for the Makefiles which cmake generated I created the new project like so   File --  new --  Makefile project with existing code   Only after couple of times doing that I have noticed that the default setting for the  Toolchain for indexer settings  is none  In my case I have changed it to Linux GCC and all the errors disappeared    Hope it helps and let me know if it is not a legit solution   Cheers   Guy

[c++] Eclipse CDT: Symbol 'cout' could not be resolved

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