Starting with Python3, standard Python installs may have additional ABI
flags attached to include directories and library names. As of 3.2, the
following flags are in the configure file:
d -> --with-debug
m -> --with-pymalloc
u -> --with-wide-unicode
Python 3.3 seems to no longer have --with-wide-unicode. Hopefully Python
will ensure that the possible flags always show up in a stable order.
The 'd' flag is ignored since the debug library is considered separate.
There is still the problem where ABI flags cannot be specified in
find_package since the letters confuse the version comparator.
If PYTHON_INCLUDE_PATH is put into the cache, then it will always
override whatever might be found and PYTHON_INCLUDE_DIR is never given a
chance to find something different. It being marked as INTERNAL also
means that it cannot be changed without editing CMakeCache.txt directly.
Basically, the scenario is that if the Python version is changed, then
deleting PYTHON_INCLUDE_DIR doesn't work because any cached
PYTHON_INCLUDE_PATH variable is set before find_path is even called. Any
build tree using a previous version will still need either manual
removal of PYTHON_INCLUDE_PATH or a complete reconfigure, but in the
future changing the Python version can be accomplished by deleting
PYTHON_INCLUDE_DIR and reconfiguring with the new version.
When cmake searches for Python libs in Windows it searches in:
[HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
However, the information might not always reside there. The information
could also reside in:
[HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]/libs
when one installs Python for a single user and not for all users.
The FindPackageHandleStandardArgs module was originally created outside
of CMake. It was added for CMake 2.6.0 by commit e118a627 (add a macro
FIND_PACKAGE_HANDLE_STANDARD_ARGS..., 2007-07-18). However, it also
proliferated into a number of other projects that at the time required
only CMake 2.4 and thus could not depend on CMake to provide the module.
CMake's own find modules started using the module in commit b5f656e0
(use the new FIND_PACKAGE_HANDLE_STANDARD_ARGS in some of the FindXXX
modules..., 2007-07-18).
Then commit d358cf5c (add 2nd, more powerful mode to
find_package_handle_standard_args, 2010-07-29) added a new feature to
the interface of the module that was fully optional and backward
compatible with all existing users of the module. Later commit 5f183caa
(FindZLIB: use the FPHSA version mode, 2010-08-04) and others shortly
thereafter started using the new interface in CMake's own find modules.
This change was also backward compatible because it was only an
implementation detail within each module.
Unforutnately these changes introduced a problem for projects that still
have an old copy of FindPackageHandleStandardArgs in CMAKE_MODULE_PATH.
When any such project uses one of CMake's builtin find modules the line
include(FindPackageHandleStandardArgs)
loads the copy from the project which does not have the new interface!
Then the including find module tries to use the new interface with the
old module and fails.
Whether this breakage can be considered a backward incompatible change
in CMake is debatable. The situation is analagous to copying a standard
library header from one version of a compiler into a project and then
observing problems when the next version of the compiler reports errors
in its other headers that depend on its new version of the original
header. Nevertheless it is a change to CMake that causes problems for
projects that worked with previous versions.
This problem was discovered during the 2.8.3 release candidate cycle.
It is an instance of a more general problem with projects that provide
their own versions of CMake modules when other CMake modules depend on
them. At the time we resolved this instance of the problem with commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28) for the 2.8.3 release.
In order to address the more general problem we introduced policy
CMP0017 in commit db44848f (Prefer files from CMAKE_ROOT when including
from CMAKE_ROOT, 2010-11-17). That change was followed by commit
ce28737c (Remove usage of CMAKE_CURRENT_LIST_DIR now that we have
CMP0017, 2010-12-20) which reverted the original workaround in favor of
using the policy. However, existing project releases do not set the
policy behavior to NEW and therefore still exhibit the problem.
We introduced in commit a364daf1 (Allow users to specify defaults for
unset policies, 2011-01-03) an option for users to build existing
projects by adding -DCMAKE_POLICY_DEFAULT_CMP0017=NEW to the command
line. Unfortunately this solution still does not allow such projects to
build out of the box, and there is no good way to suggest the use of the
new option.
The only remaining solution to keep existing projects that exhibit this
problem building is to restore the change originally made in commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28). This also avoids policy CMP0017 warnings for
this particular instance of the problem the policy addresses.
The module header was being placed in the source tree before. Thanks to
Marcel Loose for the patch, this ensures the file is written to the
build tree.
Introduced an additional variable, Python_ADDITIONAL_VERSIONS, to both
FindPythonLibs and FindPythonInterp. Changed FindPythonInterp to loop
over versions rather than hardcoding all versions (more like libs).
This puts the new search behaviour for included files in action, i.e.
now when a file from Modules/ include()s another file, it also gets the
one from Modules/ included, i.e. the one it expects.
Alex
The _TARGET_SUPPORTS_SHARED_LIBS variable was being altered outside of
the find module, moving it into the function fixes any of these scoping
issues. Fix tested and verified in VTK and Titan.
This modifies the behavior of PYTHON_WRITE_MODULES_HEADER, should be backwards
compatible. Also marked a couple of the variables generated by adding Python
modules as advanced.
When there is no shared object to link to a second call to find library is
necessary to find the static Python library. Fixes an issue raised on the CMake
mailing list, and it should be included in the next CMake patch release.
This adds copyright/license notification blocks CMake's find-modules.
Many of the modules had no notices at all. Some had notices referring
to the BSD license already. This commit normalizes existing notices and
adds missing notices.
-remove the unscriptable commands also from the cpack cmake
-use CPACK_PACKAGE_CONTACT in CMakeCPack.cmake, it's used in the nsis and
the deb generator
-make set_properties() scriptable
-use a non-const char array for adding the python modules
Alex
FIND_PACKAGE_HANDLE_STANDARD_ARGS(), so cmake modules can specify their own
better failure messages. If the default is ok use "DEFAULT_MSG".
Do this also for FindBoost.cmake (#5349)
Alex
Rolf Eike Beer
Zack Galbreath
Ben Boeckel
Christian Andersson
Brad King
Marcus D. Hanwell
Alex Neundorf
David Cole
David Gobbi
Todd Gamblin
Bill Hoffman
Ken Martin