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Stephen Kelly 23f3798c7b cmTarget: Compute link language of TARGET_OBJECTS with CMP0026 OLD (#15338)
Commit v3.1.0-rc1~297^2~5 (cmTarget: Drop 'head' argument from
GetSourceFiles, 2014-07-10) exposed a dormant bug in source file computation,
causing the test case to regress.  After that commit, the source file
computation and caching finds an existing container of source files.  Prior to
that patch, the GetSourceFiles method was called with either a null pointer
for the head cmTarget, or it was called with the this pointer.  The
processSources method is eventually called, which normalizes the difference
between the null pointer and the this pointer for the head target.  However,
the cache key depends on the actual pre-normalized pointer.  The change in
that commit caused the entry to be found in the cache where it was not before,
which resulted in incorrect behavior.

Prior to that commit, the test case also fails if the GetSourceFiles overload
taking a vector<cmSourceFile*> is changed to normalize the head target at
the beginning of the method:

  cmTarget const* head = head_ ? head_ : this;

Such a construct was correctly used in other locations where similar caching
was in place, before being removed in commit v3.1.0-rc1~310^2~25 (cmTarget:
Remove 'head' argument from GetLinkInformation, 2014-06-12), but is not
neccessary anymore.

Commit v3.1.0-rc1~674^2~2 (cmTarget: Cache the cmSourceFiles in
GetSourceFiles., 2014-04-05) introduced the caching, but fails the test case
for an unrelated reason.  That unrelated error was introduced in
commit v3.1.0-rc1~688^2~5 (cmTarget: Allow any generator expression in
SOURCES property., 2014-03-18) and fixed in
commit v3.1.0-rc1~561^2~1 (cmTarget: Fix listing of source files at
configure-time., 2014-04-13).

All commits which fail the test case in the testable way do so when such a
cached version of the source files is found and returned at generate
time.  In the test case, the cached content is populated at configure-time
through the use of the deprecated LOCATION property with CMP0026 OLD.  The
cached content is an empty container for the bar target in the test case,
because its source file 'foo.cpp.o' is not known until generate-time.  That
means that no source files are available to compute the link language and
the reported error is issued.

The actual problem is that the SourceFilesMap should be cleared after
configure time by cmTarget::ClearLinkMaps.  Clear it there now.
2015-01-13 09:36:20 +01:00
Auxiliary cmake-mode.el: syntax of '_' should be treated as symbol 2014-11-12 08:40:14 -05:00
Help Merge branch 'fix-empty-target-property-queries' into release 2015-01-11 11:50:14 -05:00
Licenses cmake-gui: Reference LGPLv2.1 when redistributing Qt 2013-11-21 11:04:24 -05:00
Modules Merge branch 'FindSDL-quoting' into release 2015-01-08 14:48:33 -05:00
Source cmTarget: Compute link language of TARGET_OBJECTS with CMP0026 OLD (#15338) 2015-01-13 09:36:20 +01:00
Templates VS: Mark Windows Phone and Store targets as App Containers 2014-09-02 10:17:02 -04:00
Tests cmTarget: Compute link language of TARGET_OBJECTS with CMP0026 OLD (#15338) 2015-01-13 09:36:20 +01:00
Utilities Merge branch 'doc-mixed-case-commands' into release 2014-12-04 10:04:29 -05:00
.gitattributes VS: Mark Windows Phone and Store targets as App Containers 2014-09-02 10:17:02 -04:00
.hooks-config.bash Add pre-commit|commit-msg|prepare-commit-msg hook placeholders 2011-10-24 10:18:36 -04:00
CMakeCPack.cmake Fix if() checks of CMAKE_SYSTEM_NAME on Cygwin 2014-09-11 21:23:24 +02:00
CMakeCPackOptions.cmake.in CPackIFW: Revise this generator 2014-08-12 15:20:59 -04:00
CMakeGraphVizOptions.cmake Convert CMake-language commands to lower case 2012-08-13 14:19:16 -04:00
CMakeLists.txt Remove unused legacy 'DartLocal.conf' file 2014-09-24 10:26:04 -04:00
CMakeLogo.gif ENH: fancier logo 2007-11-26 13:21:57 -05:00
CONTRIBUTING.rst Simplify and clarify credit text and link 2014-06-03 09:24:26 -04:00
CTestConfig.cmake Update CDash server URL 2014-06-24 13:54:52 -04:00
CTestCustom.cmake.in Merge topic 'openbsd-warnings' 2014-04-15 10:22:20 -04:00
CompileFlags.cmake Workaround for short jump tables on PA-RISC. 2014-11-10 10:26:30 -05:00
Copyright.txt Copyright.txt: Update year range to end in 2014 2014-01-02 14:11:55 -05:00
DartConfig.cmake Update CDash server URL 2014-06-24 13:54:52 -04:00
README.rst README: Add a section explaining how to report bugs 2014-08-04 09:49:49 -04:00
bootstrap bootstrap: Fix syntax for Solaris 10 shell (#15317) 2014-12-18 11:08:55 -05:00
cmake_uninstall.cmake.in Replace string(REGEX REPLACE) with string(REPLACE) where possible 2014-04-14 18:17:05 +02:00
configure Simplify bootstrap script source dir detection 2009-09-25 10:48:24 -04:00
doxygen.config Remove trailing whitespace from most CMake and C/C++ code 2012-08-13 14:18:39 -04:00

README.rst

CMake
*****

Introduction
============

CMake is a cross-platform, open-source build system generator.
For full documentation visit the `CMake Home Page`_ and the
`CMake Documentation Page`_.

.. _`CMake Home Page`: http://www.cmake.org
.. _`CMake Documentation Page`: http://www.cmake.org/cmake/help/documentation.html

CMake is maintained and supported by `Kitware`_ and developed in
collaboration with a productive community of contributors.

.. _`Kitware`: http://www.kitware.com/cmake

License
=======

CMake is distributed under the OSI-approved BSD 3-clause License.
See `Copyright.txt`_ for details.

.. _`Copyright.txt`: Copyright.txt

Building CMake
==============

Supported Platforms
-------------------

MS Windows, Mac OS X, Linux, FreeBSD, Solaris, HP-UX, IRIX, BeOS, QNX

Other UNIX-like operating systems may work too out of the box, if not
it should not be a major problem to port CMake to this platform.
Subscribe and post to the `CMake Users List`_ to ask if others have
had experience with the platform.

.. _`CMake Users List`: http://www.cmake.org/mailman/listinfo/cmake

Building CMake from Scratch
---------------------------

UNIX/Mac OSX/MinGW/MSYS/Cygwin
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

You need to have a compiler and a make installed.
Run the ``bootstrap`` script you find the in the source directory of CMake.
You can use the ``--help`` option to see the supported options.
You may use the ``--prefix=<install_prefix>`` option to specify a custom
installation directory for CMake. You can run the ``bootstrap`` script from
within the CMake source directory or any other build directory of your
choice. Once this has finished successfully, run ``make`` and
``make install``.  In summary::

 $ ./bootstrap && make && make install

Windows
^^^^^^^

You need to download and install a binary release of CMake in order to build
CMake.  You can get these releases from the `CMake Download Page`_ .  Then
proceed with the instructions below.

.. _`CMake Download Page`: http://www.cmake.org/cmake/resources/software.html

Building CMake with CMake
-------------------------

You can build CMake as any other project with a CMake-based build system:
run the installed CMake on the sources of this CMake with your preferred
options and generators. Then build it and install it.
For instructions how to do this, see documentation on `Running CMake`_.

.. _`Running CMake`: http://www.cmake.org/cmake/help/runningcmake.html

Reporting Bugs
==============

If you have found a bug:

1. If you have a patch, please read the `CONTRIBUTING.rst`_ document.

2. Otherwise, please join the the `CMake Users List`_ and ask about
   the expected and observed behaviors to determine if it is really
   a bug.

3. Finally, if the issue is not resolved by the above steps, open
   an entry in the `CMake Issue Tracker`_.

.. _`CMake Issue Tracker`: http://www.cmake.org/Bug

Contributing
============

See `CONTRIBUTING.rst`_ for instructions to contribute.

.. _`CONTRIBUTING.rst`: CONTRIBUTING.rst