[CMake] CMAKE_SYSTEM_PROCESSOR says x86 on Win64

[Martin Koller]

Hi all,

I found an old cmake bug entry (see below) for the problem I have:

I downloaded and installed the 32bit cmake exe on a 64bit windows
and wanted to build our project as 64bit executable. However in our
cmake files (which are used for Linux, Solaris, windows) we often check
for the current processor architecture we build for as we need to link
against external libraries which are stored in different subdirs etc.

Problem is: as cmake is a 32bit exe, wincrap always returns a value
of "x86" even on a 64bit machine as described here:
http://blogs.msdn.com/b/david.wang/archive/2006/03/26/howto-detect-process-bitness.aspx

In brief - they say to detect the current CPU shall be done as:

IF PROCESSOR_ARCHITECTURE == amd64 OR
   PROCESSOR_ARCHITEW6432 == amd64 THEN
   // OS is 64bit
ELSE
   // OS is 32bit
END IF

I think this should really be fixed in cmake directly to be able
to use this cmake variable in a true platform independant way
(at least it already works perfectly for all other platforms)
and the cmake doc suggest that it tells me excactly that:
"CMAKE_SYSTEM_PROCESSOR: The name of the CPU CMake is building for."
which is not correct in this case.

Shall I reopen this mantis task ?

Old bug entry: http://public.kitware.com/Bug/view.php?id=9065
-- 
Best Regards/Schöne Grüße

Martin

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A: Because it breaks the logical sequence of discussion
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