Detect Compaq compiler version with its id

Decode decimal digits from __DECC_VER and __DECCXX_VER to compute
version number components.  See documentation at:

  http://www.openvms.compaq.com/commercial/c/docs/5492p024.html#decc_ver_sec
  http://www.tru64unix.compaq.com/cplus/ugu_impl.html#predef_vernum
  http://sourceforge.net/p/predef/wiki/Compilers/#compaq-cchttpwwwopenvmscompaqcomopenvmsbrochuresdeccplus
Detect PathScale compiler version with its id

Decode decimal digits from

  __PATHCC__
  __PATHCC_MINOR__
  __PATHCC_PATCHLEVEL__

to compute version number components.  See documentation at:

  http://www.pathscale.com/docs/UserGuide.pdf
  http://sourceforge.net/p/predef/wiki/Compilers/#ekopathhttpenwikipediaorgwikipathscale
Detect TI compiler version with its id

Decode decimal digits from __TI_COMPILER_VERSION__ to compute version
number components.  See documentation at:

  http://processors.wiki.ti.com/index.php/Refer_to_Compiler_Version_in_Your_Source
  http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=spru187o
  http://sourceforge.net/p/predef/wiki/Compilers/#texas-instruments-cc-compiler
Detect Comeau compiler version with its id

Decode decimal digits from __COMO_VERSION__ to compute the version
number components.  See documentation at:

  http://www.comeaucomputing.com/4.0/docs/userman/predefs.html
  http://sourceforge.net/p/predef/wiki/Compilers/#comeau-chttpenwikipediaorgwikicomeau_cc2b2b
Detect SDCC compiler version with its id

Decode decimal digits from SDCC to compute version number components.
See documentation at:

  http://sdcc.sourceforge.net/doc/sdccman.pdf
  http://sourceforge.net/p/predef/wiki/Compilers/#small-device-c-compilerhttpenwikipediaorgwikismall_device_c_compiler
cmparseMSBuildXML: Include DisplayName in the output
VS11: Generate flag tables from MSBuild V110 tool files

Run cmparseMSBuildXML.py on cl.xml, lib.xml, and link.xml to generate
our flag tables:

 python cmparseMSBuildXML.py -x ".../MSBuild/Microsoft.Cpp/v4.0/V110/1033/cl.xml" > cmVS11CLFlagTable.h
 python cmparseMSBuildXML.py -x ".../MSBuild/Microsoft.Cpp/v4.0/V110/1033/lib.xml" > cmVS11LibFlagTable.h
 python cmparseMSBuildXML.py -x ".../MSBuild/Microsoft.Cpp/v4.0/V110/1033/link.xml" > cmVS11LinkFlagTable.h

Fix up the declaration names at the top of each file.  Finally, teach
cmVisualStudio10TargetGenerator to select the version of the table
matching the version of VS.
Detect Cray compiler version with its id

Decode decimal digits from

  _RELEASE
  _RELEASE_MINOR

to compute version number components.  See documentation at:

  http://docs.cray.com/books/S-2179-52/html-S-2179-52/zfixed5fvzxnxo.html
  http://sourceforge.net/p/predef/wiki/Compilers/#cray-c
Detect Analog VisualDSP++ compiler version with its id

Decode hex digits from __VISUALDSPVERSION__ to compute the version
number components.  Note that the constant encodes decimal digits as hex
digits (never larger than 9).  We represent them as decimal after
extraction.  See documentation at:

  http://download.analog.com/dsp/tools/VisualDSP_45_Update_6_Release_Note_v4.pdf
  http://www.analog.com/static/imported-files/software_manuals/50_asm_man.rev3.1.pdf

Note that __VISUALDSPVERSION__ was introduced in version 4.5.6.
VS: Cleanup AddPlatformDefinitions() of Visual Studio generators

Move adding of definitions into cmGlobalVisualStudioGenerator to
share code and avoid duplicate architecture string literals.
Re-order C/C++/Fortran compiler determination logic

Re-organize CMakeDetermine(C|CXX|Fortran)Compiler.cmake to search for
the compiler command-line tool only under generators for which it makes
sense.  For the Visual Studio generators we do not expect to find the
compiler tool from the environment, nor would we use the result anyway.

Furthermore, set CMAKE_${lang}_COMPILER_ID_TEST_FLAGS only when it has a
chance to be used.  Extract _CMAKE_TOOLCHAIN_LOCATION from the compiler
path after running the compiler id step so in the future that step can
help find the path to the compiler.
CMakeDetermineCompilerId: Prepare to detect IDE compiler id

Teach CMAKE_DETERMINE_COMPILER_ID to check for variable
CMAKE_${lang}_COMPILER_ID_TOOL after CMAKE_DETERMINE_COMPILER_ID_BUILD
to use as CMAKE_${lang}_COMPILER since it will not be known until after
the IDE runs.

In CMAKE_DETERMINE_COMPILER_ID_BUILD prepare a cascading "if" so we can
use a generator-specific method to compile the identification source
file.  Leave "if(0)" as a placeholder for now and put the direct
compiler invocation in "else()".  After running the compiler to build
the compiler identification source we file(GLOB) the list of output
files as candidates for extracting the compiler information.  An IDE may
create directories, so exclude exclude directories from this list.
Xcode: Detect the compiler id and tool location

Configure a hand-generated Xcode project to build the compiler id source
file since we cannot run the compiler command-line tool directly.  Add a
post-build shell script phase to print out the compiler toolset build
setting.  Run xcodebuild to compile the identification binary.  Parse
the full path to the compiler tool from the xcodebuild output.
VS10: Define CMAKE_VS_PLATFORM_TOOLSET variable

When the VS 10 generator selects a non-default PlatformToolset to
specify for MSBuild, report the selected name in this variable.
VS: Detect the compiler id and tool location

Configure a hand-generated Visual Studio project to build the compiler id
source file since we cannot run the compiler command-line tool directly.
Add a post-build command to print out the full path to the compiler tool.
Parse the full path to the compiler tool from the build output.
Cleanly enable a language in multiple subdirectories

When a language is not enabled at the top level of a project but is
enabled in multiple disjoint subdirectories we should re-use the
CMake<lang>Compiler.cmake file from the first directory.  Load the file
whenever it exists and is not left from a different version of CMake.
Test variables CMAKE_(C|CXX|Fortran)_COMPILER(|_ID|_VERSION)

Add tests CMakeOnly.CompilerId(C|CXX|Fortran) to check that the basic
compiler tool path, vendor, and version variables have been set as
expected.
Document CMAKE_<LANG>_COMPILER_(ID|VERSION) values

These values are now available almost everywhere and are tested.
Document them for general use and list possible ID values.
Merge topic 'vs11-flag-table'

9b2dda5 VS11: Generate flag tables from MSBuild V110 tool files
4cb99b1 cmparseMSBuildXML: Include DisplayName in the output
Merge topic 'more-compiler-versions'

e9bc502 Detect Analog VisualDSP++ compiler version with its id
cca386b Detect Cray compiler version with its id
622d9a7 Detect SDCC compiler version with its id
4ad7fa6 Detect Comeau compiler version with its id
952651c Detect TI compiler version with its id
74c57d9 Detect PathScale compiler version with its id
707aefd Detect Compaq compiler version with its id