Win32 builds under a Win64 host

Information

• RTI Product: RTI Connext DDS
• Version: 6.0.0
• Operating system: Win 10 64
• Compiler:
• Compiler version:
• Additional information:

What is the current behavior?

If I want to compile under Win64 for a Win32 target, and I only have the i86Win32 package installed, using the provided FindRTIConnectDDS.cmake, I get the error:

CMake Warning at C:/RTI/rti_connext_dds-6.0.0/resource/cmake/FindRTIConnextDDS.cmake:481 (message):
header_files is not installed for i86Win32 under
C:/RTI/rti_connext_dds-6.0.0
Call Stack (most recent call first):
C:/RTI/rti_connext_dds-6.0.0/resource/cmake/FindRTIConnextDDS.cmake:953 (connextdds_check_component_field_version)
CMakeLists.txt:50 (find_package)

Steps to reproduce the issue

Create a dummy CMakeLists.txt and add to it:

set(RTI_VERSION "6.0.0")

set(RTI_HOME "C:/RTI")
set(RTI_LIB "i86Win32VS2017")
    
#we are running on Win64, but buildig for Win32
set(CONNEXTDDS_ARCH "i86Win32")

set(ENV{NDDS_HOME} ${RTI_HOME}/rti_connext_dds-${RTI_VERSION})
set(NDDS_RESOURCE_CMAKE ${RTI_HOME}/rti_connext_dds-${RTI_VERSION}/resource/cmake/)
set(CONNEXTDDS_DIR $ENV{NDDS_HOME})

set(CMAKE_MODULE_PATH
    ${CMAKE_MODULE_PATH}
    ${NDDS_RESOURCE_CMAKE}
)
find_package(RTIConnextDDS
            EXACT ${RTI_VERSION}
            REQUIRED
            COMPONENTS
            core)

What is the expected behavior?

No errors running cmake.

Suggested solutions

The cmake file FindRTIConnextDDS.cmake has a section that is setting some platform specific definitions. Search for the comment: Platform-specific Definitions to find it. Under that section, the list connextdds_host_arch is being set with values guess from the CMAKE_HOST... , ignoring the supplied CONNEXTDDS_ARCH value.

Start with resource/cmake/FindRTIConnextDDS.cmake, especially the “Platform-specific Definitions” section and the handling of CONNEXTDDS_ARCH versus CMAKE_HOST values. Reproduce the issue with the supplied CMakeLists.txt on a Win64 host targeting i86Win32. Done means CMake finds the core component without the header_files warning.