In cmLocalGenerator::ConvertToRelativePath we normally convert to
relative path only if the local and remote paths both lie inside the
source tree or both lie inside the build tree.  This commit adds an
optional 'force' argument to allow conversion even when this rule is
violated.

Implicit link information contains architecture-specific libraries and
directories.  The link information cannot be explicitly specified safely
when CMAKE_OSX_ARCHITECTURES contains more than one architecture.

As a result, we currently cannot support mixed-language C++/Fortran
targets and OS X universal binaries simultaneously.  In order to avoid
conflicts for simple C/C++ cases, we now simply skip detection of
implicit link information in this case.

Put a flag in that will stop system tools from deleting system environment memory on exit, as it can cause gcov to crash the programs.

If CMakeDirectoryInformation.cmake is newer than depend.internal the include
directories may have changed, so dependencies need to be scanned again.
Ok by Brad.

Alex

We optimize this method by using the GetFileAttributesExA native Windows
API to check for file existence when possible.  For real Windows builds
we always use it.  For Cygwin we use cygwin_conv_to_win32_path to get a
native Windows path if possible and otherwise fall back to 'access'.

Cygwin-to-Windows path conversion and cache by Wojciech Migda.
See issue #8826.

Add a blank line to my contributed find modules to prevent copyright info from showing up in CMake docs

For the complex tests since they link to the CMake library make sure that they are built with the type of build.

Re-enabled failing tests; fixed ctest_build output to be consistent in the error condition across different make programs so that these tests would pass.

When reading the depend.internal file, check only once for every depender
whether it exists, instead of repeatedly in a loop for each dependee. Within
that function it can only change of the depender is removed. This is taken
care of.
This reduces the number of access() calls in kdelibs/khtml from 180000 to
90000 (i.e. 50%), and reduces the time for that (without the actual
scanning) from 0.3 s to 0.21 s on my system.

Alex

This subclass of cmGlobalXCodeGenerator only provided two virtual method
overrides, and it made construction of the Xcode generator instance
complicated.  This commit removes it and replaces the virtual methods
with tests of the Xcode version.  The change removes duplicate code.

Previously we checked for this flag by parsing the version number of GCC
out of 'gcc --version', but this is not reliable because the format can
vary greatly.  Now we run 'gcc -v --help' and look for '-isysroot' in
the list of options.

We also now store the result on a per-language basis in the per-compiler
info file "CMake<LANG>Compiler.cmake".  This is necessary to make it
accessible from try-compile projects so that they generate correctly.

The preprocessing and assembly rules also need the <DEFINES>, otherwise different reults are created.

Alex