fpc ctypes.cbool incompatible with gcc _Bool

System Information

• Operating system: KDE neon Unstable Edition
• Processor architecture: x86-64
• Compiler version:
  • 3.3.1 2f9ed057
  • 3.3.2 https://sourceforge.net/projects/freepascal/files/Linux/3.2.2/fpc-3.2.2.x86_64-linux.tar/download
  • (both same result)
• Device: Computer

Steps to reproduce

1. create file myclib.c:

   #include <stdio.h>
   void mycfunc(_Bool arg){
   	printf("number: %d\n",arg?1:2);
   }

2. gcc -O1 -shared -o libmyclib.so myclib.c

3. create file prog.pas:

   {$LINKLIB myclib}
   uses ctypes;
   procedure mycfunc(arg:ctypes.cbool);cdecl;external;
   begin
   	mycfunc(false);
   	mycfunc(true);
   end.

4. ppcx64 prog

5. LD_LIBRARY_PATH=. ./prog

What is the current bug behavior?

number: 2
number: -253

What is the expected (correct) behavior?

number: 2
number: 1