I have legacy code for an embedded 8051 core (in a cypress FX2) that used to compile with other versions of SDCC. However, current SDCC doesn't know the _naked qualifier:
delay.c:27: syntax error: token -> '_naked' ; column 21
as triggered by
static void
udelay1 (void) _naked
{
_asm ; lcall that got us here took 4 bus cycles
ret ; 4 bus cycles
_endasm;
}
and other occurrences.
As _naked practically is supposed to tell the C compiler to "nah, ignore the fact that you're a C compiler and understand that you'd need to save frame context", I don't feel like I should just #define it away.
Is there any solution to this? Should I just go ahead and manually inline the assembler wherever a _naked function is used? I feel like I'd betraying the compiler on a CALL there, and that would change the timing.
_naked was replaced by __naked in newer versions of SDCC. Same applies to asm/__asm, at/__at, interrupt,bit,xdata/__….
So, this turned out to be an exercise in regex replacements.
I'm still having linker/ranlib/mostly ar problems, and CMake ignores what I instruct it to use as compilers, but oh well.