No grow in mp_set_int (2)

[minad]

Based on #221, I tried to simplify some things. No padding to MP_PREC anymore. Ping @nijtmans

(Renamed from #252 to avoid interfering with CI)

[czurnieden]

long long is not in c89.
But I had a hard time to get a warning, even with -std=c89. Only clang with its -Weverything uttered one with the following example.

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
   long long a;
   a = 123LL;
   printf("%lld\n",a);
   exit(EXIT_SUCCESS);
}

2 warnings generated.
czurnieden ~/DIV_C_FILES$ clang -Weverything -std=c90 longlong.c -o longlong
longlong.c:7:4: warning: 'long long' is an extension when C99 mode is not enabled [-Wlong-long]
   long long a;
   ^
longlong.c:9:8: warning: 'long long' is an extension when C99 mode is not enabled [-Wlong-long]
   a = 123LL;
       ^
2 warnings generated.

The only one insisting on c89 is Debian, IIRC and they use GCC per default (or did they change that?) which I couldn't get to raise its voice. At least not with any of the default warnings (-W -Wall -Wextra), the -Wlong-long must be explicitly given.

Ignore the problem until somebody with a very old compiler complains?
It is for a measurement only, it can be replaced with an actual number for that compiler, so: yepp, ignore it.

[minad]

@czurnieden Well, long long is already in the code base ;)

This PR needs careful checking, since it changes the allocation sizes (in particular no rounding to MP_PREC). But since we have valgrind in place I am pretty confident that things are alright.

[nijtmans]

Looks perfect for me!

[nijtmans]

Thanks, @minad , for taking this further!

[minad]

Thanks for taking a look!