before 4cc2b292c0.
It's useful to be able to control the defaults and CMake's internal
logic for GCC/Clang is simple enough that doing this makes sense.
It would be nice to do the same for MSVC but CMake's internal
logic is more complicated so for now it's better that we just use
CMake's default.
compiler defines and flags when using MSVC.
There are lots of defines and flags that I'm unsure about so in
some cases I've changed the behaviour slightly (if I'm confident
the behaviour in the old build system is wrong) or not added the
flag/define at all but just left comments noting what the old build
system did and why I disagree with the old build system's choices.
This analogous to the `--optimize` flag in the Python/Makefile
build system except that we now support doing LTO with Clang/GCC
as well. However it is probably best to avoid doing LTO with
Clang or GCC for now because I see a bunch of warnings about
ODR violations when building with LTO.
LTO can be enabled with the new `LINK_TIME_OPTIMIZATION` option
which is off by default.
using MSVC. This is set by the old build system but we weren't setting
it. This actually MSVC's default but in an effort to try to behave
more like the old build system we will set it anyway.
The setting of overrides was broken (the CXX flags were not set but
the C flags were) and we aren't even using the C compiler any more.
The C compiler is used by the example C project but that is built
as an external project now so we don't need C support anymore.
The setting of defaults was also very fragile. CMake has quite
complicated support here (e.g. MSVC with a clang based tool chain) which
would likely not work properly with the override approach as it existed.
This means we loose some of the custom linker flags we were setting for
MSVC but we were never doing a great job of replicating the exact set of
flags used in the old build system anyway. Subsequent commits will
gradually fix this.
file for the build and install tree.
These files allow users of CMake to use Z3 via a CMake config package.
Clients can do `find_package(Z3 CONFIG)` to get use the package from
their projects.
When generating the files for the install tree we try to generate
the files so that they are relocatable so that it shouldn't matter
if the installed files aren't in the CMAKE_INSTALL_PREFIX when
a user consumes them. As long as the relative locations of the files
aren't changed things should still work.
A new CMake cache variable `CMAKE_INSTALL_Z3_CMAKE_PACKAGE_DIR` has been
added so that the install location of the Z3 CMake package files can be
controlled.
This addresses #915 .
CMake will automatically pick up changes in git's HEAD so that
the necessary code is rebuilt when the build system is invoked.
Two new options `INCLUDE_GIT_HASH` and `INCLUDE_GIT_DESCRIBE` have been
added that enable/disable including the git hash and the output of `git
describe` respectively. By default if the source tree is a git
repository both options are on, otherwise they are false by default.
To support the `Z3GITHASH` macro a different implementation is used from
the old build system. In that build system the define is passed on the
command line. This would not work well for CMake because CMake
conservatively (and correctly) rebuilds *everything* if the flags given
to the compiler change. This would result in the entire project being
rebuilt everytime git's `HEAD` changed. Instead in this implementation
a CMake specific version of `version.h.in` (named `version.h.cmake.in`)
is added that uses the `#cmakedefine` feature of CMake's
`configure_file()` command to define `Z3GITHASH` if it is available and
not define it otherwise. This way only object files that depend on
`version.h` get re-built rather than the whole project.
It is unfortunate that the build systems now have different `version.h`
file templates. However they are very simple and I don't want to
modify how templates are handled in the python/Makefile build system.
When using Mono support for installing/uninstalling the bindings
is also implemented. For Windows install/uninstall is not implemented
because the python build system does not implement it and Microsoft's
documentation (https://msdn.microsoft.com/en-us/library/dkkx7f79.aspx)
says that the gacutil should only be used for development and not for
production.
For now a warning is just emitted if ``INSTALL_DOTNET_BINDINGS``
is enabled and the .NET toolchain is native Windows. Someone with
better knowledge of how to correctly install assemblies under Windows
should implement this or remove this message.
A notable difference from the Python build system is the
``/linkresource:`` flag is not passed to the C# compiler. This means
a user of the .NET bindings will have to copy the Z3 library (i.e.
``libz3.dll``) to their application directory manually. The reason
for this difference is that using this flag requires the working
directory to be the directory containing the Z3 library (i.e.
``libz3.dll``) but setting this up with multi-configuration generators
doesn't currently seem possible.
by 03a8ef2795 . This relates to #463
Also leave a note regarding ``compiler_flags_override.cmake`` its
value is a bit dubious now that the compiler flags are almost the CMake
defaults.
a list ``Z3_GENERATED_FILE_EXTRA_DEPENDENCIES`` that is used by
the ``add_custom_command()`` declarations. This will let
us easily change the common dependencies for generating build files in
the future.
is applied to targets. The ``LINK_FLAGS`` property of a target is
a string and not a list and so if ``Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS``
contained more than one flag the linker line would end up being
``-flag1;flag2;flag3;...`` which would not work. Now we use a new
function ``z3_append_linker_flag_list_to_target()`` to iterate through
the list and update the ``LINK_FLAGS`` property of the specified target
correctly.
and the cmake directory into a new directory ``contrib/cmake`` that
mirrors the directory structure of the root. This is a comprimise
between me and Christoph Wintersteiger that was suggested by Arie
Gurfinkel that allows the CMake build system to live in the Z3
repository but not impact the Z3 developers that want to avoid the CMake
build system. The build system will not work in its new location
and a bootstrap script will soon be provided that allows a developer
to copy the files back to their correct location.
