Build with clang, and the core and store on macOS, again

Apple clang 21 (an M3) and clang 19 refused what gcc let pass (research
029):
- PURE_FIELD_REST was an enum of UINT32_MAX, past an int (C17): a macro.
- a store's publish copied an entry rebuild left unset when the record
  was not found (the copy was never used): copied when it was made.
- the log's image writer kept a count only Linux's sync_file_range uses.
- ",{" + (row == from) read as adding an int to a string: said plainly.
- the tests: mkdtemp, hidden by _POSIX_C_SOURCE on macOS, needs
  _DARWIN_C_SOURCE; a string split so that \x80 and a stay apart is
  bracketed; a count left over and a malloc measure only glibc has.
The core's and the store's tests pass on the Mac.

1 files changed, 1 insertions, 1 deletions

diff --git a/core/module.h b/core/module.h
index 2cc3109..162a8b1 100644
--- a/core/module.h
+++ b/core/module.h
@@ -113,7 +113,7 @@ enum { PURE_TIMER_LONGEST = 86400000, PURE_SOURCE = 64 };
  * they are not whole. */
 typedef enum { PURE_FIELD_U32 = 1, PURE_FIELD_BYTES = 2, PURE_FIELD_NUMBER = 3, PURE_FIELD_TEXT = 4,
                PURE_FIELD_ROWS = 5, PURE_FIELD_BOOL = 6, PURE_FIELD_I64 = 7 } PureFieldType;
-enum { PURE_FIELD_REST = UINT32_MAX };
+#define PURE_FIELD_REST UINT32_MAX /* a macro: an enum's values are ints (C17) */
 /* A field held in its payload's prefix (a u32, a number, a bool, an i64), and the bytes it takes there. */
 static inline bool pure_field_fixed(uint8_t type) {
     return type == PURE_FIELD_U32 || type == PURE_FIELD_NUMBER || type == PURE_FIELD_BOOL || type == PURE_FIELD_I64;