English Amiga Board - View Single Post - Amiga C - BPTR vs. int32_t - different results regarding size of variable

phx · 12 September 2021, 11:09

I admit it is confusing, and this is certainly my fault.

From Apollo's reaction I assume that he didn't expect the

kick13sm

config file to enable 16-bit int. He probably thought that the 's' stands for small code/data, which is also used here.

It adds to the confusion that small data linker libs have an 's' appended:

vcs.lib

,

amigas.lib

,

m881s.lib

.

But for the config files the 's' stands for "short int" (16-bit), as the 16-bit version of the m68k compiler backend is also called

vbccm68ks

instead of

vbccm68k

(default, 32 bit int).

The choice of the data model doesn't need a different config file. Just add

-sc

and/or

-sd

as you need it. But for small-data don't forget to link with the correct libraries:

-lvcs

is required to override the

-lvc

from the config file.

At last: As you already enabled C99, please feel free to include

<stdint.h>

which might replace your own

types.h

.

12 September 2021, 11:09	#5
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,500	I admit it is confusing, and this is certainly my fault. From Apollo's reaction I assume that he didn't expect the kick13sm config file to enable 16-bit int. He probably thought that the 's' stands for small code/data, which is also used here. It adds to the confusion that small data linker libs have an 's' appended: vcs.lib , amigas.lib , m881s.lib . But for the config files the 's' stands for "short int" (16-bit), as the 16-bit version of the m68k compiler backend is also called vbccm68ks instead of vbccm68k (default, 32 bit int). The choice of the data model doesn't need a different config file. Just add -sc and/or -sd as you need it. But for small-data don't forget to link with the correct libraries: -lvcs is required to override the -lvc from the config file. At last: As you already enabled C99, please feel free to include <stdint.h> which might replace your own types.h .