patch 8.2.2431: warning for -fno-strength-reduce with Clang 11

Problem:    Warning for -fno-strength-reduce with Clang 11.
Solution:   Adjust check for clang version number.

Author: brammool

src/auto/configure

@@ -4510,9 +4510,9 @@ if test x"$CLANG_VERSION_STRING" != x"" ; then
   CLANG_VERSION=`expr $CLANG_MAJOR '*' 1000000 '+' $CLANG_MINOR '*' 1000 '+' $CLANG_REVISION`
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CLANG_VERSION" >&5
 $as_echo "$CLANG_VERSION" >&6; }
-          { $as_echo "$as_me:${as_lineno-$LINENO}: checking if clang supports -fno-strength-reduce" >&5
+            { $as_echo "$as_me:${as_lineno-$LINENO}: checking if clang supports -fno-strength-reduce" >&5
 $as_echo_n "checking if clang supports -fno-strength-reduce... " >&6; }
-  if test "$CLANG_VERSION" -ge 500002075 ; then
+  if test "$CLANG_MAJOR" -ge 10 -o "$CLANG_VERSION" -ge 500002075 ; then
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
     CFLAGS=`echo "$CFLAGS" | sed -e 's/-fno-strength-reduce/ /'`

src/configure.ac

@@ -127,8 +127,9 @@ if test x"$CLANG_VERSION_STRING" != x"" ; then
   dnl change the constant 500002075 below appropriately.  To get the
   dnl integer corresponding to a version number, refer to the
   dnl definition of CLANG_VERSION above.
+  dnl Clang 11 reports "11", assume Clang 10 and later work like this.
   AC_MSG_CHECKING(if clang supports -fno-strength-reduce)
-  if test "$CLANG_VERSION" -ge 500002075 ; then
+  if test "$CLANG_MAJOR" -ge 10 -o "$CLANG_VERSION" -ge 500002075 ; then
     AC_MSG_RESULT(no)
     CFLAGS=`echo "$CFLAGS" | sed -e 's/-fno-strength-reduce/ /'`
   else

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2431,
 /**/
     2430,
 /**/