问题
I download eclipse for c++ (cdt-master-8.0.2.zip).
When I write:
#include <iostream>
It marks:
Unresolved inclusion: <iostream>
How can I fix it?
回答1:
Go to Project > Properties > C/C++ General > Preprocessor Includes... > Providers and select "CDT GCC Built-in Compiler Settings".
回答2:
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.
回答3:
Make sure that your file has .cpp extension and not .c, I just had this problem
回答4:
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
回答5:
Install gcc.
If you're on linux, use the package manager.
If you're on Windows, use MinGW.
回答6:
In my case it was not the CDT GCC Built-in Compiler Settings. On by including CDT GCC Built-in Compiler Settings Cygwin did the parser recognized my #include <iostream>.
回答7:
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
回答8:
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]".
回答9:
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++
回答10:
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.
回答11:
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.
回答12:
Also set "Command to get compiler specs" ${COMMAND} on Linux
First do:
- Project
- Properties
- C/C++ General
- Preprocessor Include Paths, Macros, etc.
- Providers
and then under: "Command to get compiler specs" replace:
${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"
with:
g++ -std=c++11 -E -P -v -dD "${INPUTS}"
Otherwise, it fails with:
Unable to find compiler command in toolchain=cdt.managedbuild.toolchain.gnu.base
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.
Tested on Eclipse 2019-09 R (4.13.0), Ubuntu 18.04, and this minimal Makefile project with existing sources.
来源：https://stackoverflow.com/questions/10373788/how-to-solve-unresolved-inclusion-iostream-in-a-c-file-in-eclipse-cdt