I&#39;ve built an App on Android using Delphi XE6 that requires C code. However on iOS I cannot make it work. I suspect the problem is related to arm/thumb status, but I am not sure. There is no problem in either system to call the C code from Pascal. But if the C code calls back a Pascal procedure iOS generates a `&quot;bad system call (12)&quot;`

Here is the pascal code:

    function testarm(a,b:integer):integer; cdecl; external &quot;testC.o&quot;;
        
    Procedure testC;
    Begin
      testarm(1,2);
    end;
            
    function BackToPascal(a,b:integer): integer; cdecl;
      Begin
      result := a+b;
    end;
        
    ......
        
    exports
      BackToPascal;
        

And here is the C code:

    extern int BackToPascal(int a,int b);
    
    extern int testarm(int a,int b)
    {
       int i;
       i = BackToPascal(a,b);
       return i+1;
    }

On android this is how I am compiling (It is working):

    ...&quot;arm-linux-androideabi-gcc.exe&quot; -c test.c -o test.o -O3 -mfloat-abi=softfp -mfpu=neon -marm -march=armv7-a -mtune=cortex-a8

On ios:

    xcrun -sdk iphoneos clang -c -arch armv7 test.c -O3 -mfpu=neon -mtune=cortex-a8 -marm -march=armv7-a -mfloat-abi=softfp

I suspect that my xcode settings are wrong but I cannot figure out why.

When I debug, the error comes when calling `testC` in `testarm` when calling `BackToPascal` ( on &quot;bl 0x8b8390 Xgobj.BackToPascal (int, int)&quot; ). On Android it works perfect however the `bl` does not call directly `BackToPascal`, but the following code:

    75A82D94 12C68FE2         add r12, pc, #18874368 ; 0x1200000
    75A82D98 73CA8CE2         add r12, r12, #471040 ; 0x73000
    75A82D9C 40F2BCE5         ldr pc, [r12, #576]! ; 0x240

Which get into `BackToPascal` 



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Delphi XE6 link C code in iOS