[CMake] porting to cmake 2.6 from 2.4.6

[Bill Hoffman]

Pau Garcia i Quiles wrote:
> Quoting David Blado <dblado at decarta.com>:
> 
>> Hi all,
>>
>> I recently took up the task of porting to 2.6 (again…fell off my  
>> plate for a while ☺ )
>>
>> I’m seeing this when running cmake:
>> CMake Error: Cannot determine link language for target "libraryX".
>>
>> All of the source files listed are cpp files:
>> SET(SRCS
>>   fileA
>> )
>>
>> fileA is really fileA.cpp but I’ve noticed that I can ignore the  .cpp 
>> extension and CMake will find it.
>>
>> I’m building an so:
>> SET(BUILD_SHARED_LIBS ON)
>>
>> And using: ADD_LIBRARY(${LIB_NAME} ${SRCS})
>>
>> Any idea why CMake 2.6 is all of a sudden requesting that I use:  
>> SET_TARGET_PROPERTIES(XYZ PROPERTIES LINKER_LANGUAGE CXX) when it  
>> never did w/ CMake 2.4.x?
> 
> Try SET_SOURCE_FILE_PROPERTIES( fileA PROPERTIES LANGUAGE CXX ). It's 
> backwards-compatible with 2.4.x, BTW.
> 
This was a bug that will be fixed in 2.6.1.   Although files without 
extensions are quite an "old" thing to do in CMake.

-Bill


-- 
Bill Hoffman
Kitware, Inc.
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bill.hoffman at kitware.com
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