[ITK-users] C++11?

Tue Apr 15 18:40:43 EDT 2014

Hi,

The environment variables that should be set are:

CC
CXX
CFLAGS
CXXFLAGS

For reference, see the following links:

https://github.com/Kitware/CMake/blob/593b69c9dc9e692b198f1ddbf9251130e61a4679/Modules/CMakeDetermineCCompiler.cmake#L51
https://github.com/Kitware/CMake/blob/593b69c9dc9e692b198f1ddbf9251130e61a4679/Modules/CMakeDetermineCXXCompiler.cmake#L50
https://github.com/Kitware/CMake/blob/8472ef243ffc9988ea8fb83cbc7acdf3f0daa239/Modules/CMakeCInformation.cmake#L105
https://github.com/Kitware/CMake/blob/8472ef243ffc9988ea8fb83cbc7acdf3f0daa239/Modules/CMakeCXXInformation.cmake#L20

On Tue, Apr 15, 2014 at 6:26 PM, Becksfort, Jared <
Jared.Becksfort at stjude.org> wrote:

> From earlier email, I think there is in fact a problem with the flags for
> the C compiler:
>
> I have attached the version generated by ccmake for this file:
>
> Modules/ThirdParty/KWSys/src/KWSys/CMakeFiles/itksys.dir/flags.make
>
> Note it has a -std=c++11 in the C flags.  Any thoughts on why it's there
> and how to remove it?
>
> I don't have C_FLAGS set anywhere, and it doesn't appear in the ccmake
> screen (although neither does my CXX_FLAGS and it shows up, so who knows).
>
> Thanks again,
> Jared
>
> On 4/15/14 5:03 PM, "Becksfort, Jared" <Jared.Becksfort at STJUDE.ORG> wrote:
>
> >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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>
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