Eclipse shows error, but project compiles and executes - c++

Question

I'm working in a Eclipse MARS C++ project. The following code compiles and executes perfectly even though Eclipse keeps showing some errors.
The code:
#include <iostream>
#include <ratio>
#include <chrono>
using namespace std;
int main()
{
typedef std::chrono::duration<int> seconds_type;
typedef std::chrono::duration<int,std::milli> milliseconds_type;
typedef std::chrono::duration<int,std::ratio<60*60>> hours_type;
hours_type h_oneday (24);
seconds_type s_oneday (60*60*24);
milliseconds_type ms_oneday (s_oneday);
seconds_type s_onehour (60*60);
hours_type h_onehour (std::chrono::duration_cast<hours_type>(s_onehour));
milliseconds_type ms_onehour (s_onehour);
std::cout << ms_onehour.count() << "ms in 1h" << std::endl;
}
The errors:
Symbol 'duration' could not be resolved.
Type 'std::milli' could not be resolved.
Symbol 'ratio' could not be resolved.
Symbol 'duration_cast' could not be resolved.
Method 'count' could not be resolved.
Invalid overload of 'std::endl'.
I think all the errors are about something with the includes.
The message when building:
Invoking: Cross G++ Compiler
g++ -D__GXX_EXPERIMENTAL_CXX0X__ -O0 -g3 -Wall -c -fmessage-length=0 -std=c++11 -MMD -MP -MF"src/Teste.d" -MT"src/Teste.o" -o "src/Teste.o" "../src/Teste.cpp"
Finished building: ../src/Teste.cpp
Building target: Teste
Invoking: Cross G++ Linker
g++ -o "Teste" ./src/Teste.o
Finished building target: Teste
I've already put -std=c++11 on PROJECT > PROPERTIES > C/C++ BUILD > SETTINGS > MISCELLANEOUS.
I've already put __GXX_EXPERIMENTAL_CXX0X__ on C/C++ GENERAL > PATHS AND SYMBOLS > SYMBOLS too.
I've already cleaned and rebuild it, closed and reopened it (project and eclipse), but nothing happens. This is a 1 file project, how can Eclipse find 8 errors in it and still compile and execute it? I think its just the editor messing with me. Can anyone help me to be free from the errors?

Answer 1

Don't trust Eclipse, or Visual Studio or any other IDE for that matter. The parser they use to give you "red squiggles" in the editor is not the real compiler. It has different bugs, it has different levels of standard compliance, it has very little time to parse your code (since it's interactive).
It will give false results.
The 'in-editor' parsers are nice, helpful & convenient tools. But they are not the compiler proper and they should not be interpreted as more than helpful hints.