standard boolean c

[terryc321]

use standard boolean c library allows compilation to complete otherwise gcc clang complain and stop with error

[ 96%] Building C object tools/CMakeFiles/cmprev.dir/src/cmprev.c.o self/tools/src/cmprev.c:16:16: error: cannot use keyword ‘false’ as enumeration constant
16 | typedef enum { false, true } bool;
| ^~~~~
self/self/tools/src/cmprev.c:16:16: note: ‘false’ is a keyword with ‘-std=c23’ onwards
self/self/tools/src/cmprev.c:16:30: error: expected ‘;’, identifier or ‘(’ before ‘bool’
16 | typedef enum { false, true } bool;
| ^~~~

[nbuwe]

Just use CC='cc -std=gnu99' or something (ditto for CXX) to compile on your system. Self sources can still be compiled on quite old systems (e.g. macosx/powerpc with gcc 4.0). Your system compiler might have switched to C23 by default, but that doesn't mean you have to use that default to compile Self.

Note also, that non-vintage clang (13+, iirc) miscompiles Self and cannot be used.