Eclipse C Symbol std could not be resolved

Question

I am getting this error in the TestExecute cpp -       Symbol  std  could not be resolved    CODE   include  lt iostream gt  using namespace std    I just created a executable project in Eclipse  in Windows 7  as shown below  It seems like I am selecting a toolchain that is not supported  Is it so  I have installed Cygwin and it is available in preferences   EDIT  Based on  RobertoWilko comment  removing the line  using namespace std     removed the error  But the binary is not created    Launch Failed  Binary not found   How to correct this

User · Answer

I do not know whether you have solved this problem but I want to post my solution for those might ran into the same problem.

First, make sure that you have the "Includes" folder in your Project Explorer. If you do not have it, go to second step. If you have it, go to third step.
Second, Window -> Preferences-> C/C++- > Build >Environment: Create two environment variables:

a) Name: C_INCLUDE_PATH Value: /usr/include

b) Name: CPLUS_INCLUDE_PATH Value: /usr/include/c++

Go to Cygwin/usr/include/, if you cannot find folder "c++", copy it from \cygwin\lib\gcc\i686-pc-cygwin\X.X.X\include and Then restart your Eclipse.

Third, Right Click your project in Project Explorer -> Properties -> C/C++ General -> Paths and Symbols -> Includes -> Languages:GNU C++ If you can find some C++ folders in the "Include directories" then click Apply and OK. Change a bit your codes, and save it.

You will find there will be not symbol could not be resolved problems.

I documented my solution, hoping someone might get benefits.

User · Answer

What allowed me to fix the problem was going to  Project -  Properties -  C C   General -  Preprocessor Include Paths  Macros  etc  -  Providers -  CDT GCC built-in compiler settings  enabling that and disabling the CDT Cross GCC Built-in Compiler Settings

User · Answer

Try out this step  https   www eclipse org forums index php t 636348   Go to   Project -  Properties -  C C   General -  Preprocessor Include Paths  Macros  etc  -  Providers   Activate CDT GCC Built-in Compiler Settings Deactivate Use global provider shared between projects Add the command line argument -std c  11

User · Answer

The problem you are reporting seems to me caused by the following    you are trying to compile C code and the source file has  cpp extension you are trying to compile C   code and the source file has  c extension   In such situation Eclipse cannot recognize the proper compiler to use

User · Answer

Install C   SDK   Help   Install New Software   Work with  path for your eclipse version   search for C   and install C   sdk development tools   Example for a path  Mars - http   download eclipse org releases mars

User · Answer

This worked for me on Eclipse IDE for C C   Developers Version  2020-03  4 15 0  Build id  20200313-1211  Also  my code is cross-compiled    Create a new project making sure it s created as a cross-compiled solution  You have to add the  usr bin directory that matches your cross-compiler location  Add the C and C   headers for the cross-compiler in the Project Properties  For C  Project   Properties   C C   General   Paths and Symbols   Includes   GNU C  Add    -  The path to your  usr include directory from your cross-compiler  For C    Project   Properties   C C   General   Paths and Symbols   Includes   GNU C    Add    -  The path to your  usr include c    directory from your cross-compiler  If you don t know your gcc version  type this in a console  make sure it s your cross gcc binary    gcc -v Modify the dialect for the cross-compilers  this was the trick   For C  Project   Properties   C C   Build   Settings   Tool Settings   Cross GCC Compiler   Dialect  Set to ISO C99  -std C99  or whatever fits your C files standard  For C    Project   Properties   C C   Build   Settings   Tool Settings   Cross G   Compiler   Dialect  Set to ISO C  14  -std c  14  or whatever fits your C   files standard  If needed  re-index all your project by right-clicking the project   Index   Rebuild

User · Answer

The includes folder in the project is probably missing  usr include c    Goto your project in project explorer  right click -  Properties -  C C   Build -  Environment -  add -  value   usr include c    Restart eclipse

User · Answer

You can rewrite the code likes this    include lt iostream gt   include lt stdio h gt   using namespace std

User · Answer

I was having this problem using Eclipse Neon on Kubuntu with a 16 04 kernel  I had to change my  include  lt stdlib h gt  to  include  lt cstdlib gt  this made the std namespace  visible  to Eclipse and removed the error

User · Answer

Try restart Eclipse first  in my case I change different Compiler setting of the project then it shows this message  after restart it works

User · Answer

For MinGW this worked for me    Right click project  select Properties Go to C C   General - Paths and Symbols - Includes - GNU C   - Include directories Select Add    Select Variables    Select MINGW HOME and click OK Click Apply and OK   You should now see several MinGW paths in Includes in your project explorer  The errors may not disappear instantly  you may need to refresh build your project     If you are using Cygwin  there could be an equivalent variable present

[c++] Eclipse C++: Symbol 'std' could not be resolved

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