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built with `-fvisibility-inlines-hidden`.
This was observed when using a bottled version of LLVM 3.4 on macOS
that appears to have been built with this option.
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When trying to KLEE with a version of LLVM (specifically, 3.5) built from
Github (https://github.com/llvm-mirror/llvm/tree/release_35) the regex in
find_llvm.cmake failed to match the LLVM version string because it was suffixed
with "svn" - i.e. "3.5.2svn".
Added the optional "svn" suffix to the CMake regex to fix this.
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`llvm-config` when using LLVM 3.5 and newer.
In newer versions of `llvm-config`, `--ldflags` doesn't give
the system libraries anymore. Instead we need to use `--system-libs`.
Issue reported by @ryosa .
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Now LLVM libraries are added as imported targets and their link dependencies
are explicitly stated so CMake can get the link order correct.
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This fixes issue #507.
We can't build the components as shared libraries right now due
to cyclic dependencies (see #502 for a fix) and there are a few
other patches needed too (see #507).
Building the components as shared libraries isn't really desirable
anyway because it would require us to ship KLEE's libraries which
don't have a stable API.
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This is done as a separate commit because it imports
third party code. It's under the Boost license though
so it "should be" fine.
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This is based off intial work by @jirislaby in #481. However it
has been substantially modified.
Notably it includes a separate build sytem to build the runtimes which
is inspired by the old build system. The reason for doing this is
because CMake is not well suited for building the runtime:
* CMake is configured to use the host compiler, not the bitcode
compiler. These are not the same thing.
* Building the runtime using `add_custom_command()` is flawed
because we can't automatically get transitive depencies (i.e.
header file dependencies) unless the CMake generator is makefiles.
(See `IMPLICIT_DEPENDS` of `add_custom_command()` in CMake).
So for now we have a very simple build system for building the runtimes.
In the future we can replace this with something more sophisticated if
we need it.
Support for all features of the old build system are implemented apart
from recording the git revision and showing it in the output of
`klee --help`.
Another notable change is the CMake build system works much better with
LLVM installs which don't ship with testing tools. The build system
will download the sources for `FileCheck` and `not` tools if the
corresponding binaries aren't available and will build them. However
`lit` (availabe via `pip install lit`) and GTest must already be
installed.
Apart from better support for testing a significant advantage of the
new CMake build system compared to the existing "Autoconf/Makefile"
build system is that it is **not** coupled to LLVM's build system
(unlike the existing build system). This means that LLVM's
autoconf/Makefiles don't need to be installed somewhere on the system.
Currently all tests pass.
Support has been implemented in TravisCI and the Dockerfile for
building with CMake.
The existing "Autoconf/Makefile" build system has been left intact
and so both build systems can coexist for a short while. We should
remove the old build system as soon as possible though because it
creates an unnecessary maintance burden.
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