macro: terminate the temporary VA_ARGS_FOREACH() array with a sentinel

So gcc-14 doesn't complain we're out of bounds on the last iteration:

[2092/2414] Compiling C object test-macro.p/src_test_test-macro.c.o
In file included from ../src/basic/list.h:209,
                 from ../src/basic/log.h:10,
                 from ../src/test/test-macro.c:5:
../src/test/test-macro.c: In function ‘test_FOREACH_VA_ARGS’:
../src/basic/macro.h:395:90: warning: array subscript 1 is outside array bounds of ‘uint8_t[1]’ {aka ‘unsigned char[1]’} [-Warray-bounds=]
  395 |              ((long)(_current_ - _entries_) < (long)ELEMENTSOF(_entries_)) && ({ entry = *_current_; true; }); \
../src/basic/macro.h:392:9: note: in expansion of macro ‘_VA_ARGS_FOREACH’
  392 |         _VA_ARGS_FOREACH(entry, UNIQ_T(_entries_, UNIQ), UNIQ_T(_current_, UNIQ), ##__VA_ARGS__)
      |         ^~~~~~~~~~~~~~~~
../src/test/test-macro.c:322:9: note: in expansion of macro ‘VA_ARGS_FOREACH’
  322 |         VA_ARGS_FOREACH(u8, 0) {
      |         ^~~~~~~~~~~~~~~
../src/fundamental/macro-fundamental.h:163:37: note: at offset 1 into object ‘__unique_prefix__entries_181’ of size 1
  163 | #define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
      |                                     ^~~~~~~~~~~~~~~~
../src/basic/macro.h:394:28: note: in definition of macro ‘_VA_ARGS_FOREACH’
  394 |         for (typeof(entry) _entries_[] = { __VA_ARGS__ }, *_current_ = _entries_; \
      |                            ^~~~~~~~~
../src/fundamental/macro-fundamental.h:109:27: note: in expansion of macro ‘XCONCATENATE’
  109 | #define CONCATENATE(x, y) XCONCATENATE(x, y)
      |                           ^~~~~~~~~~~~
../src/fundamental/macro-fundamental.h:163:25: note: in expansion of macro ‘CONCATENATE’
  163 | #define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
      |                         ^~~~~~~~~~~
../src/basic/macro.h:392:33: note: in expansion of macro ‘UNIQ_T’
  392 |         _VA_ARGS_FOREACH(entry, UNIQ_T(_entries_, UNIQ), UNIQ_T(_current_, UNIQ), ##__VA_ARGS__)
      |                                 ^~~~~~
../src/test/test-macro.c:322:9: note: in expansion of macro ‘VA_ARGS_FOREACH’
  322 |         VA_ARGS_FOREACH(u8, 0) {
      |         ^~~~~~~~~~~~~~~

(cherry picked from commit dc571cc)
(cherry picked from commit 0ddd788)
(cherry picked from commit d44fe47)
(cherry picked from commit 6a8d6e2)

Author: mrc0mmand

src/basic/macro.h

@@ -442,10 +442,10 @@ assert_cc(sizeof(dummy_t) == 0);
 /* Iterate through each variadic arg. All must be the same type as 'entry' or must be implicitly
  * convertable. The iteration variable 'entry' must already be defined. */
 #define VA_ARGS_FOREACH(entry, ...)                                     \
-        _VA_ARGS_FOREACH(entry, UNIQ_T(_entries_, UNIQ), UNIQ_T(_current_, UNIQ), ##__VA_ARGS__)
-#define _VA_ARGS_FOREACH(entry, _entries_, _current_, ...)         \
-        for (typeof(entry) _entries_[] = { __VA_ARGS__ }, *_current_ = _entries_; \
-             ((long)(_current_ - _entries_) < (long)ELEMENTSOF(_entries_)) && ({ entry = *_current_; true; }); \
+        _VA_ARGS_FOREACH(entry, UNIQ_T(_entries_, UNIQ), UNIQ_T(_current_, UNIQ), UNIQ_T(_va_sentinel_, UNIQ), ##__VA_ARGS__)
+#define _VA_ARGS_FOREACH(entry, _entries_, _current_, _va_sentinel_, ...)         \
+        for (typeof(entry) _va_sentinel_[1] = {}, _entries_[] = { __VA_ARGS__ __VA_OPT__(,) _va_sentinel_[0] }, *_current_ = _entries_; \
+             ((long)(_current_ - _entries_) < (long)(ELEMENTSOF(_entries_) - 1)) && ({ entry = *_current_; true; }); \
              _current_++)
 
 #include "log.h"