Fix generation of bison output for out-of-source builds.

Make sure the #line directives contain existing source file  sql_yacc.yy.
Before the patch #line directive would point out to non-existing path in
current build directory.

.gitignore

@@ -197,6 +197,7 @@ sql/lex_token.h
 sql/gen_lex_token
 sql/gen_lex_hash
 sql/lex_hash.h
+sql/myskel.m4
 sql/mysql_tzinfo_to_sql
 sql/mysqld
 sql/sql_builtin.cc

sql/CMakeLists.txt

@@ -356,12 +356,13 @@ IF (NOT BISON_FOUND)
       MESSAGE(FATAL_ERROR ${ERRMSG})
   ENDIF()
 ELSE()
+  CONFIGURE_FILE(myskel.m4.in myskel.m4)
   BISON_TARGET(gen_mariadb_cc_hh ${CMAKE_CURRENT_BINARY_DIR}/yy_mariadb.yy
                                  ${CMAKE_CURRENT_BINARY_DIR}/yy_mariadb.cc
-               COMPILE_FLAGS "-p MYSQL -S ${CMAKE_CURRENT_SOURCE_DIR}/myskel.m4")
+               COMPILE_FLAGS "-p MYSQL -S ${CMAKE_CURRENT_BINARY_DIR}/myskel.m4")
   BISON_TARGET(gen_oracle_cc_hh ${CMAKE_CURRENT_BINARY_DIR}/yy_oracle.yy
                                 ${CMAKE_CURRENT_BINARY_DIR}/yy_oracle.cc
-               COMPILE_FLAGS "-p ORA -S ${CMAKE_CURRENT_SOURCE_DIR}/myskel.m4")
+               COMPILE_FLAGS "-p ORA -S ${CMAKE_CURRENT_BINARY_DIR}/myskel.m4")
 ENDIF()
 
 IF(NOT CMAKE_CROSSCOMPILING OR DEFINED CMAKE_CROSSCOMPILING_EMULATOR)

sql/myskel.m4.in

@@ -3,7 +3,7 @@
 # to refer to the original sql_yacc.yy
 #
 m4_define([b4_syncline],
-[b4_sync_start([$1], m4_bpatsubst([$2],[yy_[a-z]+\.yy],sql_yacc.yy))[]dnl
+[b4_sync_start([$1], m4_bpatsubst([$2],[@CMAKE_CURRENT_BINARY_DIR@/yy_[a-z]+\.yy],@CMAKE_CURRENT_SOURCE_DIR@/sql_yacc.yy))[]dnl
 
 ])