Hi all,

Updated version of the patch mainly addressing comments on the
concurrency issues.

I came to the conclusions that the caching should be done in the
function that we decide to be thread safe.  However I haven't touched
parse_basever in any direction in the hope of having this still in
stage4.  As result I've mostly applied the mutex solution.

'make check-jit' runs clean

Bests

  Andrea

gcc/jit/ChangeLog
2020-??-??  Andrea Corallo  <andrea.corallo@arm.com>
	    David Malcolm  <dmalcolm@redhat.com>

	* docs/topics/compatibility.rst (LIBGCCJIT_ABI_13): New ABI tag
	plus add version paragraph.
	* libgccjit++.h (namespace gccjit::version): Add new namespace.
	* libgccjit.c (gcc_jit_version_major, gcc_jit_version_minor)
	(gcc_jit_version_patchlevel): New functions.
	* libgccjit.h (LIBGCCJIT_HAVE_gcc_jit_version): New macro.
	(gcc_jit_version_major, gcc_jit_version_minor)
	(gcc_jit_version_patchlevel): New functions.
	* libgccjit.map (LIBGCCJIT_ABI_13) New ABI tag.

gcc/testsuite/ChangeLog
2020-??-??  Andrea Corallo  <andrea.corallo@arm.com>

	* jit.dg/test-version.c: New testcase.
	* jit.dg/all-non-failing-tests.h: Add test-version.c.