[PATCH 0/7] test: better backtracing in the test suite

[Peter Hutterer]

The check unit test framework isn't particularly suited to having ck_assert*
calls in helper functions. A failed assertion in a helper function or the
litest framework merely gives us a the failed line in litest.c.
which doesn't tell us which test actually failed.

We're using more and more helper functions to make the tests smaller, so in
most cases a test failure doesn't tell us where it failed.  This patchset
adds a backtracing facility, copied from the xserver's xorg_backtrace().

For now it only changes the helper functions, not the tests, though it looks
like we can just do a general s/ck_assert/litest_assert/ if it turns out to
be helpful.

Cheers,
  Peter