Merge 10.5 into 10.6

mysql-test/suite/innodb/r/fk_col_alter.result

@@ -81,4 +81,14 @@ DROP TABLE t2, t1;
 CREATE TABLE t (a VARCHAR(40), b INT, C INT) ENGINE=InnoDB;
 ALTER TABLE t MODIFY a VARCHAR(50), DROP b;
 DROP TABLE t;
+#
+#  MDEV-32060 Server aborts when table doesn't
+#		have referenced index
+#
+SET SESSION FOREIGN_KEY_CHECKS = OFF;
+CREATE TABLE t1 (a VARCHAR(16) KEY, FOREIGN KEY(a) REFERENCES t2(b)) ENGINE=InnoDB;
+CREATE TABLE t2 (b VARCHAR(8)) ENGINE=InnoDB;
+SET SESSION FOREIGN_KEY_CHECKS = ON;
+ALTER TABLE t2 MODIFY b VARCHAR(16), ADD KEY(b);
+DROP TABLE t1, t2;
 # End of 10.4 tests

mysql-test/suite/innodb/t/fk_col_alter.test

@@ -111,4 +111,15 @@ DROP TABLE t2, t1;
 CREATE TABLE t (a VARCHAR(40), b INT, C INT) ENGINE=InnoDB;
 ALTER TABLE t MODIFY a VARCHAR(50), DROP b;
 DROP TABLE t;
+
+--echo #
+--echo #  MDEV-32060 Server aborts when table doesn't
+--echo #		have referenced index
+--echo #
+SET SESSION FOREIGN_KEY_CHECKS = OFF;
+CREATE TABLE t1 (a VARCHAR(16) KEY, FOREIGN KEY(a) REFERENCES t2(b)) ENGINE=InnoDB;
+CREATE TABLE t2 (b VARCHAR(8)) ENGINE=InnoDB;
+SET SESSION FOREIGN_KEY_CHECKS = ON;
+ALTER TABLE t2 MODIFY b VARCHAR(16), ADD KEY(b);
+DROP TABLE t1, t2;
 --echo # End of 10.4 tests

sql/CMakeLists.txt

@@ -179,8 +179,8 @@ SET (SQL_SOURCE
                ${MYSYS_LIBWRAP_SOURCE}
 )
 
-IF(CMAKE_C_COMPILER_ID MATCHES "Clang" AND
-   NOT CMAKE_C_COMPILER_VERSION VERSION_LESS "13.0.0")
+MY_CHECK_CXX_COMPILER_FLAG(-Wno-unused-but-set-variable)
+IF(have_CXX__Wno_unused_but_set_variable)
   ADD_COMPILE_FLAGS(${CMAKE_CURRENT_BINARY_DIR}/yy_mariadb.cc
     ${CMAKE_CURRENT_BINARY_DIR}/yy_oracle.cc
     COMPILE_FLAGS "-Wno-unused-but-set-variable")

storage/innobase/CMakeLists.txt

@@ -510,8 +510,9 @@ IF(MSVC)
   # on generated file.
   TARGET_COMPILE_OPTIONS(innobase PRIVATE "/wd4065")
 ENDIF()
-IF(CMAKE_C_COMPILER_ID MATCHES "Clang" AND
-   NOT CMAKE_C_COMPILER_VERSION VERSION_LESS "13.0.0")
+
+MY_CHECK_CXX_COMPILER_FLAG(-Wno-unused-but-set-variable)
+IF(have_CXX__Wno_unused_but_set_variable)
   ADD_COMPILE_FLAGS(pars/pars0grm.cc fts/fts0pars.cc
     COMPILE_FLAGS "-Wno-unused-but-set-variable")
 ENDIF()

storage/innobase/handler/handler0alter.cc

@@ -7776,6 +7776,8 @@ bool check_col_is_in_fk_indexes(
   {
     for (ulint i= 0; i < f->n_fields; i++)
     {
+      if (!f->referenced_index)
+        continue;
       if (f->referenced_index->fields[i].col == col)
       {
         my_error(ER_FK_COLUMN_CANNOT_CHANGE_CHILD, MYF(0),