How to compile Objective-C on the command line on Mac OS X

objc-gcc.m

/*
 * To compile objective-c on the command line:
 *
 * gcc -framework Foundation objc-gcc.m
 *
 * You may have to link with -lobjc or other libs,
 * as required.
 */

#import <Foundation/Foundation.h>

int main(int argc, char** argv)
{
  NSLog(@"Testing");
}

Thanks guys. That second one worked for me too.

I was trying to compile with #import "MYHEADER.h", I can successfully compile with -I(header search path).

clang -std=c99 -pedantic -Wall -Wextra -Wno-import -lobjc -framework Foundation \
 -I MYHEADERSDIR \
 ALLMYMFILES \
 -o main

-framework Foundation worked for me. Thanks!

For some reason I couldn't use -framework Foundation using brew installed clang

$ /usr/local/opt/llvm/bin/clang -Wall -framework Foundation a.m
a.m:1:9: fatal error: 'Foundation/Foundation.h' file not found
#import <Foundation/Foundation.h>
        ^~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

but using Apple built, /usr/bin/clang -Wall -framework Foundation a.m so feel free to check your list of installed clang maybe using where clang

@ebraminio make sure you have Xcode tools downloaded

$ xcode-select install