GCC 13 build problems (this is for tracking when the move from GCC 10/11 happens)

[Berzerkula]

I have been building with an upcoming release of GCC and this may affect some people. Just getting it out there as eventually we will be at GCC 13 or later.

1. src/libm/math/kf_rem_pio2.c

src/libm/math/kf_rem_pio2.c: In function '__kernel_rem_pio2f':
src/libm/math/kf_rem_pio2.c:186:24: error: 'fq' may be used uninitialized [-Werror=maybe-uninitialized]
  186 |                 fw = fq[0]-fw;
      |                      ~~^~~
src/libm/math/kf_rem_pio2.c:63:26: note: 'fq' declared here
   63 |         float z,fw,f[20],fq[20],q[20];
      |                          ^~
cc1: all warnings being treated as errors

Edit libs/Makefile FLAGS -Wno-error=maybe-uninitialized

2. memcheck.c

   In file included from ../../../code/software/libs/build/include/stdio.h:20,
                from memcheck.c:16:
   In function 'show_banner',
   inlined from 'main' at memcheck.c:400:3:
   ../../../code/software/libs/build/include/printf.h:59:16: error: array subscript 0 is outside array bounds of 'uint32_t[0]' {aka 'long unsigned int[]'} [-Werror=array-bounds=]
   59 | #define printf printf_
   memcheck.c:346:5: note: in expansion of macro 'printf'
   346 |     printf("* Firmware reports %8ld bytes total contiguous memory *\n", *FW_MEMSIZE);
     |     ^~~~~~
   In function 'main':
   cc1: note: source object is likely at address zero
   cc1: all warnings being treated as errors

   Edit memcheck/Makefile CFLAGS -Wno-array-bounds

3. updateflash.c

   updateflash.c: In function 'main':
   updateflash.c:214:25: error: array subscript 256 is outside array bounds of 'void[4]' [-Werror=array-bounds=]
   214 |         if (version_info->major != 0) {
     |                         ^~
   updateflash.c:29:14: note: at offset 1024 into object '_end' of size 4
   29 | extern void *_end;
     |              ^~~~
   updateflash.c:218:33: error: array subscript 256 is outside array bounds of 'void[4]' [-Werror=array-bounds=]
   218 |                     version_info->is_extdata ? "Required" : "Not required");
     |                                 ^~
   updateflash.c:29:14: note: at offset 1024 into object '_end' of size 4
   29 | extern void *_end;
     |              ^~~~
   updateflash.c:216:54: error: array subscript 256 is outside array bounds of 'void[4]' [-Werror=array-bounds=]
   216 |                     version_info->major, version_info->minor,
     |                                                      ^~
   updateflash.c:29:14: note: at offset 1024 into object '_end' of size 4
   29 | extern void *_end;
     |              ^~~~
   updateflash.c:220:29: error: array subscript 256 is outside array bounds of 'void[4]' [-Werror=array-bounds=]
   220 |             if (version_info->is_huge) {
     |                             ^~
   updateflash.c:29:14: note: at offset 1024 into object '_end' of size 4
   29 | extern void *_end;
     |              ^~~~
   cc1: all warnings being treated as errors

   Edit updateflash/Makefile CFLAGS -Wno-array-bounds