[CMake] CMake ignores CPLUS_INCLUDE_PATH?

[Alain Leblanc]

On 10/19/2009 04:35 PM, David Doria wrote:
> On Mon, Oct 19, 2009 at 4:31 PM, Eric Noulard<eric.noulard at gmail.com>  wrote:
>    
>> 2009/10/19 David Doria<daviddoria at gmail.com>:
>>      
>>>> You can use $ENV{CPLUS_INCLUDE_PATH} to get the contents of the path.
>>>>
>>>>          
>>> I tried to do this:
>>> INCLUDE_DIRECTORIES(${INCLUDE_DIRECTORIES} $ENV{CPLUS_INCLUDE_PATH})
>>>        
>> I think the appropriate syntax should be:
>>
>> INCLUDE_DIRECTORIES($ENV{CPLUS_INCLUDE_PATH}))
>>
>> even if I don't know if comma separated value is supported because
>> the doc says:
>>      
> My understanding was that:
> INCLUDE_DIRECTORIES(a)
> sets INCLUDE_DIRECTORIES to a
>
> where
> INCLUDE_DIRECTORIES(${INCLUDE_DIRECTORIES} a)
> sets INCLUDE_DIRECTORIES to what it was PLUS a
>
> Is this correct?
>
> Also, these are colon separated values in the .bashrc file - so is the
> answer that cmake cannot do this? If so, does it seem like a
> reasonable feature request?
>
> Thanks,
>
> David
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The CPLUS_INCLUDE_PATH variable is separated with colons (':'). For 
cmake you need to replace those with either spaces or semicolons (sorry, 
can't remember exactly). This is what I have in one of my files.

if (NOT $ENV{CPLUS_INCLUDE_PATH}  STREQUAL "")
   string (REPLACE ":" " " INCLUDES $ENV{CPLUS_INCLUDE_PATH})
   string (REPLACE "//" "/" INCLUDES ${INCLUDES})
   string(REGEX MATCHALL "[^ ]+" LIST_INCLUDES ${INCLUDES})
endif (NOT $ENV{CPLUS_INCLUDE_PATH}  STREQUAL "")

I forgot why I needed the second REPLACE. The first one replaces the ':' 
with spaces. The REGEX_MATCHALL creates a list with all paths in the 
original CPLUS_INCLUDE_PATH. At the end you probably want

include_directories(LIST_INCLUDES)

Sorry it's been a while since I wrote this and didn't do a good job 
documenting. Let me know if it does not solve your problem.

a