With gcc-8.2.1 on Fedora29, there are the errors below.
../core/z80/z80.c:470:21: error: ISO C does not allow extra ';' outside of a function [-Wpedantic]
PROTOTYPES(Z80op,op);
^
../core/z80/z80.c:471:21: error: ISO C does not allow extra ';' outside of a function [-Wpedantic]
PROTOTYPES(Z80cb,cb);
^
../core/z80/z80.c:472:21: error: ISO C does not allow extra ';' outside of a function [-Wpedantic]
PROTOTYPES(Z80dd,dd);
^
../core/z80/z80.c:473:21: error: ISO C does not allow extra ';' outside of a function [-Wpedantic]
PROTOTYPES(Z80ed,ed);
^
../core/z80/z80.c:474:21: error: ISO C does not allow extra ';' outside of a function [-Wpedantic]
PROTOTYPES(Z80fd,fd);
^
../core/z80/z80.c:475:25: error: ISO C does not allow extra ';' outside of a function [-Wpedantic]
PROTOTYPES(Z80xycb,xycb);
^
make: *** [Makefile.sdl2:183: build_sdl2/z80.o] Error 1
Some games can benefit from a little overclocking but start behaving
strangely at 2x. Make the internal overclock ratio a fixed point
number and add 3 fractional settings.
This reduces all cycle costs by half for the primary CPU. There
is a delay upon loading before overclocking is applied as a
workaround for some games that detect PAL/NTSC systems by counting
cycles in a frame at startup.