Remove code left for supporting earlier CMake versions.

The previous commit did not compile with mingw gcc.
Use the Windows type FARPROC instead of void* for
the local variable.

CMake fails to find any registry paths on Windows 2000: according to regmon
it fails with an access denied error. I double checked all the access rights
and they are fine. After checking the access modes on MSDN I found that it
says KEY_WOW64_32KEY / KEY_WOW64_64KEY are not supported on Windows 2000.
CMake does not check if the current system supports Wow64 before applying
these flags.

This commit adds a check for IsWow64Process in kernel32.dll before adding
these flags.

Author: Axel Gembe <ago@bastart.eu.org>
Signed-off-by: Axel Gembe <ago@bastart.eu.org>

Author: Rolf Eike Beer <eike@sf-mail.de>  2010-10-18 12:03:39

To get from Hz to MHz the factor is 10^6, not 2^20.

Author: Rolf Eike Beer <eike@sf-mail.de>  2010-10-24 06:31:11

The header was included only under "#ifdef __linux", but not all Linux
distributions provide the header.  SystemInformation uses no symbols
from this header, so do not include it.

Pass the lpClass argument of RegCreateKeyEx as a real char[] instead of
a string literal.  At least one platform declares the argument as char*
instead of "const char*".

Use std::string instead of fixed-size char arrays.

Author: Ben Boeckel <ben.boeckel@kitware.com>

This method replaces '//' with '/' to make the paths look nicer.
Originally it correctly skipped a leading '//' in a UNC path as the
comment says.  However, commit "Removed extra variable initializations"
(2005-04-15) accidentally removed the "pos=1" initializer.  It was then
incorrectly restored by commit "Added missing variable initialization"
(2005-04-15) as just "pos=0".  Restore the proper initializer.

The test for this added by commit "better coverage" (2006-07-31)
included incorrect output for a sample UNC-like path.  Fix it.

Do not set KWSYS_INSTALL_LIBRARY_RULE just because the parent project set
KWSYS_INSTALL_EXPORT_NAME.  Require KWSYS_INSTALL_LIB_DIR to be set too.

Commit "merge in changes for beos support" (2006-12-04) added a realpath
call for every directory parsed out of a PATH-style environment
variable.  No reason was given in the commit message or comments.

The call incorrectly resolves symlinks in referenced paths.  Remove it.
If BeOS support really needs it then it can be restored for that
platform with a full explanation.

A parent project may now set KWSYS_INSTALL_EXPORT_NAME to specify the
EXPORT name for install(TARGETS) commands.

Modify a few lines in the function QueryOSInformation.

Change-Id: Ief8327144fdf5588354d4ce8240eb0206722e77e
Author: Marius Staring <m.staring@lumc.nl>

The code does contain a cast that increases alignment but only in a
conditional that verifies the input is sufficiently aligned.

Revert commit: CMake: quote ':' in Windows NMake Makefiles (#9963) -- it was not the right fix and caused mucho other problemo

Avoid using the old SplitString method in favor of the more robust
SplitPath method.

Document explicitly that the first component always exists.  Fix the
documentation of SplitPathRootComponent to note that home directory
roots (~/ and ~u/) always have a trailing slash.

See issue #11023.

Author: Clinton Stimpson <clinton@elemtech.com>

Windows paths may begin with a single backslash when the drive letter is
omitted.  Recognize this as a root path component.

Clang is smart enough to recognize that "*(int*)0=0" invokes undefined
behavior, warns, and produces an "undefined instruction".  The message
in commit "Avoid Clang optimizer bug in testProcess-[45]" (2010-07-02)
is incorrect; this is not a Clang bug.  It really is undefined
behavior.  Use "*(int*)1=0" to produce a crash instead.

Clang's optimizer, as of clang version 2.8 (trunk 107463), produces the
undefined instruction 'ud2' for the code "*(int*)0=0" on OS X x86_64.
It causes our crash tests to fail because the child process exits with
an invalid instruction instead of a segmentation fault.  Work around the
bug by using "*(int*)1=0" in this case.

Add option KWSYS_TEST_BOGUS_FAILURES that can be set by a containing
project or in the CMake cache to list tests known to fail consistently
on a buggy system.

If any of the KWSys Process tests take more than a minute or two then
something is wrong.  There is no need to wait for a long default
timeout.

Since commit "Provide unix-sytle command line parsing" (2009-07-13) the
reference to KWSYS_C_HAS_PTRDIFF_T in System.c has been meaningless
because the macro was never passed to the compiler!

Define KWSYS_DO_NOT_CLEAN_PUTENV only for the implementation.  It does
not need to be configured in the interface of "Configure.hxx".

Do not try to execute a child with no command line.  Previously this led
to a silent hang.

The DynamicLoader::LibPrefix and DynamicLoader::LibExtension methods
previously hard-coded the module name components for each platform.  Set
them from the CMAKE_SHARED_MODULE_PREFIX and CMAKE_SHARED_MODULE_SUFFIX
CMake variables instead.  This ensures consistency in a program that
uses these methods to construct the file names for its own modules.

The CopyFileIfDifferent, CopyFileAlways, CopyAFile and CopyADirectory
methods should always copy permissions.  The special cases in which a
caller would pass copyPermissions=false should be handled at the call
site.  The parameter needlessly complicates the interface and semantics
of these methods.

On Windows 7 the file size reported by 'stat' on a new file sometimes
reports zero even though the real size is correct.  This causes our
CopyFileAlways method to falsely detect copy failure.  Work around the
problem by trusting the state of ofstream after writing the file.

kFreeBSD and Hurd have the same userland as Linux.  This change is
necessary to enable kwsysProcessKill() to kill child processes on
kFreeBSD.  The bug was detected by CTestTestTimeout test.

Patch from "Modestas Vainius <modestas@vainius.eu>".
See issue #10432.

Patch from Chuck Atkins <chuck.atkins@kitware.com>

Patch from Chuck Atkins <chuck.atkins@kitware.com>

Patch to avoid short name usage where possible. Get the actual case spelling of a file name on 'Windows' without converting to short name and back again. Avoids bad behavior reported in http://bugs.winehq.org/show_bug.cgi?id=22286 when using cmake under a wine/msys/mingw installation on a Linux box. Thanks to Clinton Stimpson for preparing the patch.