[ITK] [ITK-users] C++11?

[Becksfort, Jared]

Thank you Brad and Hans for replying.  Unfortunately I am still having
problems. Two things I think are odd are that

- ccmake finds my CXX environment variable but not my CXX_FLAGS, according
to the curses window.
- It seems like the error I am getting is that it is trying to add
-std=c++11 to the compilation of a C file.

I remove the bin/* directory between each attempt, so I doubt it is a
caching problem.

L130723:bin jbecksfo$ echo $CXX
/usr/bin/clang++		### this value shows up in the ccmake configuration
window
L130723:bin jbecksfo$ echo $CXX_FLAGS
-std=c++11 -stdlib=libc++	### this value does not show up in the ccmake
configuration window


I then run make (which I *think* I am supposed to do) and the error I get
happens whether I use cmake with arguments or ccmake:

Scanning dependencies of target itksys
[ 21%] Building C object
Modules/ThirdParty/KWSys/src/KWSys/CMakeFiles/itksys.dir/ProcessUNIX.c.o
error: invalid argument '-std=c++11' not allowed with 'C/ObjC'
make[2]: *** 
[Modules/ThirdParty/KWSys/src/KWSys/CMakeFiles/itksys.dir/ProcessUNIX.c.o]
Error 1
make[1]: *** 
[Modules/ThirdParty/KWSys/src/KWSys/CMakeFiles/itksys.dir/all] Error 2
make: *** [all] Error 2

I can attach files if that would help.  I appreciate very much whatever
information you can provide.

Thanks,
Jared





On 4/14/14 10:31 AM, "Bradley Lowekamp" <blowekamp at mail.nih.gov> wrote:

>Hello,
>
>Just to further elaborate, in the cmake configuration you need to add
>"-std=c++11", to CMAKE_CXX_FLAGS on the command line before the first
>configuration something like:
>
>cmake -DCMAKE_CXX_FLAGS="-std=c++11" /your/source/ITK
>
>Alternatively you can set the CXX_FLAGS environment variable similarly.
>Either way this should be  done a new build directory with a clean
>configuration, not a reconfiguration.
>
>Additionally, project that use this C++11 build of ITK should use the
>same flag.
>
>Brad
>
>On Apr 13, 2014, at 11:33 AM, Johnson, Hans J <hans-johnson at uiowa.edu>
>wrote:
>
>> Jared,
>> 
>> ADD_DEFINTIONS is not intended for compiler flags.  You need to
>>configure
>> the build initializing with the C++ flags
>> 
>> CXX=Œ/usr/bin/clang¹ CXX_FLAGS=³-std=c++11²  ccmake ../ITK
>> 
>> Hans
>> 
>> 
>> 
>> On 4/12/14, 10:41 PM, "Becksfort, Jared" <Jared.Becksfort at STJUDE.ORG>
>> wrote:
>> 
>>> Hello,
>>> 
>>> I was hoping to build the 4.5.2 with C++11.  Are there instructions for
>>> doing so?  I tried adding
>>> 
>>> ADD_DEFINITIONS(
>>>   -std=c++11
>>> )
>>> 
>>> to the CMakeLists.txt file, which felt like a hack and didn't work:
>>> 
>>> Scanning dependencies of target itksys
>>> [ 21%] Building C object
>>> 
>>>Modules/ThirdParty/KWSys/src/KWSys/CMakeFiles/itksys.dir/ProcessUNIX.c.o
>>> error: invalid argument '-std=c++11' not allowed with 'C/ObjC'
>>> make[2]: ***
>>> 
>>>[Modules/ThirdParty/KWSys/src/KWSys/CMakeFiles/itksys.dir/ProcessUNIX.c.
>>>o]
>>> Error 1
>>> make[1]: ***
>>> [Modules/ThirdParty/KWSys/src/KWSys/CMakeFiles/itksys.dir/all] Error 2
>>> make: *** [all] Error 2
>>> 
>>> Thanks,
>>> Jared
>>> 
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