Compile the library in freestanding mode
Looking closely, we never explicitly depend on the standard library
within the actual library code. This can be explicitly expressed by
setting -ffreestanding during object-compilation and -nostdlib during
linking. The result is a clean library with zero libc-symbols, allowing
it to be used even without an operating system (kernel code, ELF,
etc.), by making use of the freestanding implementation form defined
in the standard[0].
To be freestanding, the code may only include <float.h>, <iso646.h>,
<limits.h>, <stdalign.h>, <stdarg.h>, <stdbool.h>, <stddef.h>,
<stdint.h> and <stdnoreturn.h>. We satisfy this condition implictly,
but there are some erroneous supplementary includes that are removed
in this commit. Additionally, the strict compiler-implementation simply
adds the U-prefix to the argument of UINT16_C (et. al.), which is why
calls to it have to be changed to really include only constants.
[0]:https://www.iso-9899.info/n1570.html#4.p6
Signed-off-by: Laslo Hunhold <dev@frign.de>
7 files changed
