fucntion variable by ref/val droping info

[BPMan]

I compiling a very large system with fortran, ada, c, and C++. The different componets are being compilied and placed in archives then linked toghether. A problem I am seeing is that functions written in C and referenced externally by other C functions seem to drop data. Example Program:

void main()
{
myFunction();
}

Output is:
var1 = 0;
var2 = 0.000;

in File1.c:
void somefunction(int var1, float var2){
printf("var1 = %d\n",var1);
printf("var2 = %f\n",var2);
}

in Files2.c:
void myFunction(){
int var1 = 5;
float var2 = 5.5;
somefunction(var1, var2);
}

However if I change somecfunction to:
void somefunction(int *var1, float *var2)
and pass the variables in by reference the output is correct. Can anyone explain why this problem is happening and a fix so i don't have to change all the functions to pass by reference. Also this is not happening in all cases. Thanks.

 

[xwb]

What do the prototypes look like? Presumably they are

extern void somefunction (int,float);
extern void myFunction (void);

Reason I'm asking is that in C, you don't need prototypes: they can be

extern void somefunction();
extern void myFunction();

The problem with this is that on some compilers floats may get converted to doubles. If the parameters are passed backwards as they sometimes are, then they may get clobbered.

One possible fix is to only pass doubles and to only convert them to float for printing. Sounds just as bad as your fix for pointers but maybe there aren't as many floats being passed round.