Fix the detection of Clang versions

Use __clang_major__ instead of LLVM_VERSION_MAJOR.

Author: Julien-Elie

frontends/ovdb_stat.c

@@ -1,6 +1,10 @@
 /*
  * ovdb_stat.c
  * print information about ovdb database
+ *
+ * Created by Heath Kehoe in 2000.
+ * Various bug fixes, code and documentation improvements since then
+ * in 2000-2004, 2006, 2008, 2013-2015, 2018, 2021-2025.
  */
 
 #include "portable/system.h"
@@ -248,7 +252,7 @@ end_table(void)
  * like GCC or Clang, but is undefined behaviour by the C Standard as it is
  * unknown whether all hardware platforms can actually process such pointer
  * arithmetic (many, if not all, can anyway). */
-#    if LLVM_VERSION_MAJOR > 12
+#    if defined(__clang__) && __clang_major__ > 12
 #        pragma GCC diagnostic ignored "-Wnull-pointer-subtraction"
 #    endif
 #    define OFFSETOF(type, f) ((char *) &(((type *) 0)->f) - (char *) 0)

include/innperl.h

@@ -1,5 +1,9 @@
 /*
 **  Declarations for embedded Perl.
+**
+**  Put into a separate header file in 2002.
+**  Various bug fixes, code and documentation improvements since then
+**  in 2002, 2003, 2015, 2021, 2024, 2025.
 */
 
 #ifndef INNPERL_H
@@ -12,7 +16,7 @@
 
 /* Suppress warnings triggered by Perl macros like PUSHMARK or POPp. */
 #    if defined(__llvm__) || defined(__clang__)
-#        if LLVM_VERSION_MAJOR > 11
+#        if __clang_major__ > 11
 #            pragma GCC diagnostic ignored "-Wcompound-token-split-by-macro"
 #        endif
 #        pragma GCC diagnostic ignored "-Wgnu-statement-expression"

innfeed/imap_connection.c

@@ -1,7 +1,10 @@
 /*
 **  Feed articles to an IMAP server via LMTP and IMAP.
 **
-**  Written by Tim Martin.
+**  Written by Tim Martin in 2000.
+**
+**  Various bug fixes, code and documentation improvements since then
+**  in 2000-2004, 2006-2011, 2013-2016, 2018, 2021, 2022, 2024, 2025.
 **
 **  Instead of feeding articles via nntp to another host this feeds the
 **  messages via lmtp to a host and the control messages (cancel's etc..) it
@@ -1329,7 +1332,7 @@ getsecret(sasl_conn_t *conn, void *context UNUSED, int id,
     return SASL_OK;
 }
 
-#    if __GNUC__ > 7 || LLVM_VERSION_MAJOR > 12
+#    if __GNUC__ > 7 || (defined(__clang__) && __clang_major__ > 12)
 #        pragma GCC diagnostic ignored "-Wcast-function-type"
 #    endif
 
@@ -1342,7 +1345,7 @@ static sasl_callback_t saslcallbacks[] = {
     {SASL_CB_LIST_END, NULL,                          NULL}
 };
 
-#    if __GNUC__ > 7 || LLVM_VERSION_MAJOR > 12
+#    if __GNUC__ > 7 || (defined(__clang__) && __clang_major__ > 12)
 #        pragma GCC diagnostic warning "-Wcast-function-type"
 #    endif