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compiling .cpp as .mm

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I have a small portion of c++ code that needs to compile as obj-c++ on a mac. Rather than keeping a copy of the file with a .mm extension, I'm trying to get gcc to compile the .cpp file as obj-c++, but it doesn't seem to want to. Are there any parameters I can pass that will get gcc to work nicely?

This is a simpler file I've been trying to get to compile:

#import <stdio.h>
#import <Foundation/NSObject.h>

@interface hello:NSObject

int main(int argc,char** argv)
return 0;

And the makefile

main: main.cpp
g++ -lobjc -o main main.cpp

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