I will take care of this

Installer name can be set by [1]:

set(CPACK_PACKAGE_FILE_NAME "whatever")
before
include(CPack)

if you don't CPack provides a default value:

${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}-${CPACK_SYSTEM_NAME}

This defaults to [2]:

1. CPACK_SYSTEM_NAME - System name, defaults to the value of
2. ${CMAKE_SYSTEM_NAME}.

SET(cpack_system_name ${CMAKE_SYSTEM_NAME})
IF(${cpack_system_name} MATCHES Windows)

IF(CMAKE_CL_64)
  SET(__cpack_system_name win64)
ELSE(CMAKE_CL_64)
  SET(__cpack_system_name win32)
ENDIF(CMAKE_CL_64)

ENDIF(${cpack_system_name} MATCHES Windows)
cpack_set_if_not_set(CPACK_SYSTEM_NAME "${cpack_system_name}")

[...]

cpack_set_if_not_set(CPACK_PACKAGE_FILE_NAME

"${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}-${CPACK_SYSTEM_NAME}")

Which in turn corresponds to[3]:

CMAKE_SYSTEM

the complete system name, e.g. "Linux-2.4.22", "FreeBSD-5.4-RELEASE" or "Windows 5.1"

CMAKE_SYSTEM_NAME

the short system name, e.g. "Linux", "FreeBSD" or "Windows"

The CMAKE_SYSTEM variable is set during cmake of the project, for example for Windows and Linux[4]:

Win

SET(CMAKE_SYSTEM "Windows-6.0")
SET(CMAKE_SYSTEM_NAME "Windows")
SET(CMAKE_SYSTEM_VERSION "6.0")
SET(CMAKE_SYSTEM_PROCESSOR "x86")

SET(CMAKE_HOST_SYSTEM "Windows-6.0")
SET(CMAKE_HOST_SYSTEM_NAME "Windows")
SET(CMAKE_HOST_SYSTEM_VERSION "6.0")
SET(CMAKE_HOST_SYSTEM_PROCESSOR "x86")

SET(CMAKE_CROSSCOMPILING "FALSE")

SET(CMAKE_SYSTEM_LOADED 1)

Linux 32

SET(CMAKE_SYSTEM "Linux-2.6.38-15-generic")
SET(CMAKE_SYSTEM_NAME "Linux")
SET(CMAKE_SYSTEM_VERSION "2.6.38-15-generic")
SET(CMAKE_SYSTEM_PROCESSOR "i686")

SET(CMAKE_HOST_SYSTEM "Linux-2.6.38-15-generic")
SET(CMAKE_HOST_SYSTEM_NAME "Linux")
SET(CMAKE_HOST_SYSTEM_VERSION "2.6.38-15-generic")
SET(CMAKE_HOST_SYSTEM_PROCESSOR "i686")

SET(CMAKE_CROSSCOMPILING "FALSE")

SET(CMAKE_SYSTEM_LOADED 1)

Linux 64

SET(CMAKE_SYSTEM "Linux-3.2.0-25-generic") SET(CMAKE_SYSTEM_NAME "Linux") SET(CMAKE_SYSTEM_VERSION "3.2.0-25-generic") SET(CMAKE_SYSTEM_PROCESSOR "x86_64")

SET(CMAKE_HOST_SYSTEM "Linux-3.2.0-25-generic") SET(CMAKE_HOST_SYSTEM_NAME "Linux") SET(CMAKE_HOST_SYSTEM_VERSION "3.2.0-25-generic") SET(CMAKE_HOST_SYSTEM_PROCESSOR "x86_64")

SET(CMAKE_CROSSCOMPILING "FALSE")

SET(CMAKE_SYSTEM_LOADED 1)

[1] http://cmake.3232098.n2.nabble.com/Cpack-and-output-file-naming-td7580294.html
[2] CPack.cmake in the CMake directory
[3] http://www.cmake.org/Wiki/CMake_Useful_Variables
[4] CMakeSystem.cmake im build tree

First suggested solution has been pushed in branch

bug-12274-extend-installer-name-by-architecture-for-mitk-workbench-installers

Was tested on Windows 64 Bit, Linux 64 Bit and Mac and worked for those systems.

[c5389d]: Merge branch 'bug-12274-extend-installer-name-by-architecture-for-mitk

Merged commits:

2012-09-05 16:06:11 Caspar Goch [e0d634]
Added configuration file for mitk workbench CPack