Link to compilation error:
https://epsft-jenkins.cern.ch/view/ROOT%20Nightly/job/root-nightly-master/1977/LABEL=mac1012,SPEC=noimt/parsed_console/

The error is due to a bug in clang3.5, reproducible in isolation:
https://godbolt.org/z/jtYXv6

The workaround is to avoid specifying the template parameters of a
template base class -- the full type is injected in the derived class
anyway (thanks Axel!).

In case the array of sums of TH1 was created before
painting the stack (for instance by calling GetMaximum() on the stack),
the automatic colouring of the stack was not working.

tree/treeplayer/src/TTreeFormula.cxx:2550:23: warning: ‘char* strncat(char*, const char*, size_t)’ output may be truncated copying between 0 and 1023 bytes from a string of length 1023 [-Wstringop-truncation]
                strncat(second,work,kMaxLen-1-strlen(second));
                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.../tree/tree/src/TTree.cxx: In member function ‘virtual TFile* TTree::ChangeFile(TFile*)’:
.../tree/tree/src/TTree.cxx:2642:33: warning: ‘%d’ directive output may be truncated writing between 1 and 11 bytes into a region of size between 1 and 10 [-Wformat-truncation=]
             snprintf(fcount,10, %s%d, uscore, fFileNumber);
                                 ^~~~~~
.../tree/tree/src/TTree.cxx:2642:33: note: directive argument in the range [-2147483648, 1]
.../tree/tree/src/TTree.cxx:2642:21: note: ‘snprintf’ output between 2 and 21 bytes into a destination of size 10
             snprintf(fcount,10, %s%d, uscore, fFileNumber);
             ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.../tree/tree/src/TTree.cxx:2632:33: warning: ‘%d’ directive output may be truncated writing between 1 and 10 bytes into a region of size between 1 and 10 [-Wformat-truncation=]
             snprintf(fcount,10, %s%d, uscore, fFileNumber);
                                 ^~~~~~

In core/zip/inc/Compression.h was introduced RCompressionSetting class with set of enumerated classes for compression level, compression algorithm and default compression settings

thanks Oksana for spotting this.

Fix a bug in setting different luxury levels for Ranlux. When calling SetSeed, the default luxury level was alway set.

This reverts commit 0030cfc5.

  1. No need to make it a friend
  2. No need for the ABI compatibility workaround. Now this is in a library and not interpreted.

it can become a plain internal helper.

to support the PCRE dialect.
This is done because TRegexp is insufficient for common task such as
expressing an OR.
The choice is documented and a test is added.