MDEV-22641: postfix - crc32{,c} fixups for ppc64

include/my_sys.h

@@ -923,7 +923,7 @@ extern int unpackfrm(uchar **, size_t *, const uchar *);
 
 void my_checksum_init(void);
 #ifdef HAVE_CRC32_VPMSUM
-extern my_checksum(ha_checksum, const void *, size_t);
+extern ha_checksum my_checksum(ha_checksum, const void *, size_t);
 #else
 typedef ha_checksum (*my_crc32_t)(ha_checksum, const void *, size_t);
 extern MYSQL_PLUGIN_IMPORT my_crc32_t my_checksum;

mysys/CMakeLists.txt

@@ -100,7 +100,7 @@ ELSEIF(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
     ENDIF()
   ENDIF()
 ELSEIF(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64")
-  SET(HAVE_CRC32_VPMSUM 1)
+  SET(HAVE_CRC32_VPMSUM 1 PARENT_SCOPE)
   SET(MYSYS_SOURCES ${MYSYS_SOURCES} $<TARGET_OBJECTS:crc32c> $<TARGET_OBJECTS:crc32ieee>)
 
   ADD_LIBRARY(crc32c OBJECT crc32/crc32_ppc64.c)

mysys/checksum.c

@@ -18,6 +18,7 @@
 #include <my_sys.h>
 #include <zlib.h>
 
+#if !defined(HAVE_CRC32_VPMSUM)
 /* TODO: remove this once zlib adds inherent support for hardware accelerated
 crc32 for all architectures. */
 static unsigned int my_crc32_zlib(unsigned int crc, const void *data,
@@ -26,7 +27,6 @@ static unsigned int my_crc32_zlib(unsigned int crc, const void *data,
   return (unsigned int) crc32(crc, data, (unsigned int) len);
 }
 
-#if !defined(HAVE_CRC32_VPMSUM)
 my_crc32_t my_checksum= my_crc32_zlib;
 #endif