How to solve Unresolved inclusion iostream in a C file in Eclipse CDT

Question

I download eclipse for c    cdt-master-8 0 2 zip    When I write    include  lt iostream gt    It marks   Unresolved inclusion   lt iostream gt    How can I fix it

User · Answer

On Windows  with Eclipse CDT Oxygen  none of the solutions described here worked for me  I described what works for me in this other question  Eclipse CDT  Unresolved inclusion of stl header

User · Answer

Go to Project   Properties   C C   General   Preprocessor Includes      Providers and select  CDT GCC Built-in Compiler Settings

User · Answer

Install gcc   If you re on linux  use the package manager   If you re on Windows  use MinGW

User · Answer

I tried all previously mentioned answers  but in my case I had to manually specify the include path of the iostream file  As I use MinGW the path was   C  MinGW lib gcc mingw32 4 8 1 include c    You can add the path in Eclipse under  Project   C C   General   Paths and Symbols   Includes   Add  I hope that helps

User · Answer

I am running eclipse with cygwin in Windows    Project   Properties   C C   General   Preprocessor Includes      Providers  and selecting  CDT GCC Built-in Compiler settings Cygwin  in providers list solved problem for me

User · Answer

I use Eclipse for cross compiling and I have to add the explicit directories for some of the standard C    libraries  Right click your project and select Properties  You ll get the dialog shown in the image  Follow the image and use the   icon to explicitly add the paths to your C   libraries

User · Answer

In my case  it was not the CDT GCC Built-in Compiler Settings  Only after I included CDT GCC Built-in Compiler Settings Cygwin did the parser recognized my  include  lt iostream gt

User · Answer

For those using a fresh install of Ubuntu  or another Linux distro  make sure your have at least the package  build-essential  before you try to compile Eclipse CDT projects   At Terminal  type   sudo apt-get install build-essential   It should be enough to compile and run your apps    Of course  you can also perform full g   install   using   sudo apt-get install g

User · Answer

I m using Eclipse with Cygwin and this worked for me   Go to Project   Properties   C C   General   Preprocessor Includes      Providers  and select  CDT GCC Built-in Compiler Settings Cygwin  Shared

User · Answer

It sounds like you haven t used this IDE before   Read Eclipse s  Before You Begin  page and follow the instructions to the T   This will make sure that Eclipse  which is only an IDE  is actually linked to a compiler   http   help eclipse org indigo index jsp topic  org eclipse cdt doc user concepts cdt c before you begin htm

User · Answer

Also set   COMMAND  to g   on Linux  Under    Project Properties C C   General Preprocessor Include Paths  Macros  etc  Providers CDT GCC Built-in Compiler Settings Command to get compiler specs   Replace     COMMAND    FLAGS  -E -P -v -dD    INPUTS     with   g   -std c  11 -E -P -v -dD    INPUTS     If you don t do this  the Eclipse stdout shows   Unable to find full path for  -E    and logs under   HOME  eclipse-workspace  metadata  log show    ENTRY org eclipse cdt core 4 0 2020-04-23 20 17 07 288  MESSAGE Error  Cannot run program  -E   Unknown reason   because   COMMAND    FLAGS  are empty  and so Eclipse tries to execute the -E that comes next   I wonder if we can properly define the COMMAND and FLAGS variables on the settings  but I tried to add them as build variables and it didn t work   C version of the question   quot Unresolved inclusion quot  error with Eclipse CDT for C standard library headers  Tested on Eclipse 2020-03  4 15 0   Ubuntu 19 10  and this minimal Makefile project with existing sources

User · Answer

Make sure that your file has  cpp extension and not  c  I just had this problem

User · Answer

I d had this issue with Eclipse 2019-12 where the includes were previously being resolved  but then weren t   This was with a Meson build C C   project   I m not sure exactly what happened  but closing the project and reopening it resolved the issue for me

[c++] How to solve "Unresolved inclusion: <iostream>" in a C++ file in Eclipse CDT?

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