Set up the ssh credentials so we are able to talk to localhost and
issue git commands. Move to use a script, as the command list is
getting somewhat long.
While here, delay installing valgrind until we need it, as it and its
dependencies are by far the largest downloads and this allows us to
start compiling (and failing) faster and we only incur this cost when
the test suite runs successfully.
With the current code, running 'cmake .' in an already-configured
directory causes the removal of ssh flags passed to the compiler,
making it impossible to build with ssh support but by removing CMake's
cache.
Remove the check for LIBSSH2_LIBRARY and let CMake do the right thing
wrt finding the library.
Create a new section of clar tests "stress" that will default to
being off where we can put slow tests that push the library for
performance testing purposes.
b53671a (Search for zlib unconditional, 2012-12-18) changed things
around to always (even on windows, that's what the subject refers to)
call FIND_PACKAGE(ZLIB).
However, it did not correctly handle the case where ZLIB_LIBRARY is
cached, either by the user setting it manually or by an earlier
search. In that case, the IF(ZLIB_FOUND) would not trigger (that
variable is not cached) and we'd instead use the built-in version.
000e689 (CMake: don't try to use bundled zlib when the system's path
is in the cache, 2013-05-12) tried to fix that, but it actually made
the problem worse: now with ZLIB_LIBRARY cached, _neither_ of the
blocks would execute, resulting in a linker error for me when trying
to build such a doubly-configured setup.
To fix the issue, we just trust CMake to do the right thing. If
ZLIB_LIBRARY is set (either from user or cache) then the find_library
in FindZLIB.cmake will use that instead of searching again. So we can
unconditionally (for real this time) call FIND_PACKAGE(ZLIB), and just
check its result.
The code surrounding zlib bundling did not take into consideration
that ZLIB_LIBRARY gets cached, and assumed that FIND(ZLIB) would
always set ZLIB_FOUND, which does not hold true, as this variable
signifies that we have found the package and had to look at the
system, as its location was not cached.
Only use the bundled sources if the external zlib is neither
newly-found nor cached.
