This patch should go into 3.4 branch first. We will merge changes from 3.4 into master regularly (weekly/bi-weekly).

So, please:

• change "base" branch of this PR: master => 3.4 (use "Edit" button near PR title)
• rebase your commits from master onto 3.4 branch. For example:
  git rebase -i --onto upstream/3.4 upstream/master
  (check list of your commits, save and quit (Esc + "wq" + Enter)
  where upstream is configured by following [this GitHub guide]
  (https://help.github.com/articles/configuring-a-remote-for-a-fork/) and fetched (git fetch upstream).
  In this case (due merge commit) you should squash commits into one before rebase.
• push rebased commits into source branch of your fork (with --force option)

Note: no needs to re-open PR, apply changes "inplace".

You should check commit message and its content.
You may use "gitk" (builtin git tool) locally for that.

The error produced by build bot is:

/persistence_yml.cpp:36:31: error: 'd' was not declared in this scope
while( cv_isprint(d) && d != ' ' && d != '>' );
^
/build/precommit_linux64/3.4/opencv/modules/core/src/persistence.hpp:216:36: note: in definition of macro 'cv_isprint'
#define cv_isprint(c) ((uchar)(c) >= (uchar)' ')
^
/build/precommit_linux64/3.4/opencv/modules/core/src/persistence_yml.cpp:42:21: error: 'value_type' was not declared in this scope
value_type |= CV_NODE_USER;
^
/build/precommit_linux64/3.4/opencv/modules/core/src/persistence_yml.cpp: At global scope:

I checked the file persistence_yml.cpp but where I found that 'd' was declared as
do d = *++typeEndPtr;

whereas value_type is not declared.
I didn't even make changes in these files how/why do these files generate error, is it because I rebased my branch where I merged changes from others as well to resolve the conflicts.

I didn't even make changes in these files

You should check contents of this patch:

• Files changed 10

You bring unnecessary/wrong code changes from other branch.

I didn't even make changes in these files

You should check contents of this patch:

* Files changed 10

You bring unnecessary/wrong code changes from other branch.

I Will fix that

Commits 4
Files changed 4

Please remove unnecessary changes from the patch. We should have 1 commit and 1 changed file here.
Commits squashing and/or commit amending may help to do that.

Commits 4
Files changed 4

Please remove unnecessary changes from the patch. We should have 1 commit and 1 changed file here.
Commits squashing and/or commit amending may help to do that.

Done