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

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

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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

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

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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

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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

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

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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

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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

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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

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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

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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

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

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