How to call C function in .m file from another function in a .mm file

I am making an interface class between a C library and an objetive C application.
I have not problem calling function the C library from .mm funstions,
but I am having problems calling .m functions from the .mm class.
here is an example of what I mean.
here in my .m vector file
*struct dVector*
* float m_x;*
* float m_y;*
* float m_z;*
* float m_w;*
*struct dVector InitVector (float x, float y, float z, float w);*
*struct dVector AddVector (struct dVector* A, struct dVector* B);*
*struct dVector SubVector (struct dVector* A, struct dVector* B);*
here is my .mm class
*#import <Foundation/Foundation.h>*
*@interface iNewton : NSObject*
* void* m_world;*
*-(id) init;*
*-(void) dealloc;*
-(void) CreateBox: (Entity*) ent: (int) shapeId;*
@end
here is the implemrntation of function funtion CreateBox in a .mm file
[code]-(void*) CreateBox: (Entity*) ent: (int) shapeId
struct dVector minBox;
struct dVector maxBox;
// this is fine
[ent GetBBox: &minBox: &maxBox];
//calculate the box size and dimensions of the physics collision shape
// this report a link errors, and I do no knwo why
struct dVector size = SubVector(&maxBox, &minBox);
struct dVector origin = AddVector (&maxBox, &minBox);
// thsi work without problemen
return NewtonCreateBox ((NewtonWorld*) world, size.m_x, size.m_y, size.m_z, shapeId, &offset.mfront.mx);
I get these compiler errors
Building target “tutorial102AddingRigidBody” of project “newton_iPhone” with configuration “Debug_Emulation” — (3 errors)
cd /Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newton_iPhone
setenv MACOSXDEPLOYMENTTARGET 10.5
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr /bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.0 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator2.2 .1.sdk -L/Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newtoniPhone/build/DebugEmulation-iphonesimulator -L/Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newton_iPhone/../sdk -F/Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newtoniPhone/build/DebugEmulation-iphonesimulator -filelist /Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newtoniPhone/build/Debug_Emulation-iphonesimulator/tutorial_102_AddingRigidBody.build/ Objects-normal/i386/tutorial_102AddingRigidBodies.LinkFileList -mmacosx-version-min=10.5 -framework Foundation -framework UIKit -framework OpenGLES -framework QuartzCore -framework CoreGraphics -lnewton_iPhoneEmulation -o /Users/juliojerez/Desktop/NewtonMac/NewtonSDK/newtoniPhone/build/Debug_Emulation-iphonesimulator/tutorial_102_AddingRigidBodies.app/ tutorial_102AddingRigidBodies
Undefined symbols:
"AddVector(dVector*, dVector*)", referenced from:
-[iNewton CreateBox::] in iNewton.o
"SubVector(dVector*, dVector*)", referenced from:
-[iNewton CreateBox::] in iNewton.o
"Scale(dVector*, float)", referenced from:
-[iNewton CreateBox::] in iNewton.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
"AddVector(dVector*, dVector*)", referenced from:
-[iNewton CreateBox::] in iNewton.o
"SubVector(dVector*, dVector*)", referenced from:
-[iNewton CreateBox::] in iNewton.o
"Scale(dVector*, float)", referenced from:
-[iNewton CreateBox::] in iNewton.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
Build failed (3 errors)
Basically I can call objective C class methods from .mm files,
but I can not call functions who are not members of a class from .mm funtions.
Does any one knows how I can solve this?
I have two books on objective C and neither show how to do that.
Please I will apreciate if some one can help me with this.
Julio Jerez

julio jerez wrote:
// this is fine
[ent GetBBox: &minBox: &maxBox];
why will tha be wrong?
ent is a objective C class with a method GetBBox
wich I use in hundred of places with out problem.
Beside that is not the problem that.
Well, you've got me on this one. You are correct. Apparently you don't need to specify the parameter names. Still, I strongly encourage you to use parameter names. Even though they apparently aren't required, I've never seen them not used. I would have expected to see:
[ent GetBBoxMin: & minBox max: & maxBox]
The problem is calling C function that are declared in .m files.
if you read the errors, they are linking errors not compiler errors.
this is a C function that is declared in a .m file
struct dVector size = SubVector(&maxBox, &minBox);
beside I also use those functions in many other place as well in teh project and they work.
If it helps I can post a link to the a download place to the xcode project maybe it is eassy to see what I am trying to do.
That would probably be a good idea.
Normally, all you need is
extern "C"
but there is so much missing from what you've posted that I can't tell for sure what is going on.

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