add small precision about -warn-error

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14760 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
fix various things

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14761 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Protocol to allow ppx processors to report warnings to the compiler (reported as warning 22).

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14762 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Eradicate one more sprintf().


git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14763 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Follow-up to r14763: use caml_stat_free instead of plain free.


git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14764 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
fixes to Travis CI script from Anil

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14765 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Merge remote-tracking branch 'ocaml/trunk' into trunk-no-naked-pointers
address Damien's comments