[cmake-developers] CXX_STANDARD and linking

[CHEVRIER, Marc]

On Solaris, activating C++11 standard switch the compiler into a completely different mode:
* Mangling is different
* C++ runtime is the GNU one, delivered as part of SolarisStudio 12.4 (Sun C++ runtime is no longer supported)

This is why the flag -std=c++11 must be passed to the link step to enable compiler to select the correct runtime…

Marc




On 28/09/15 21:20, "cmake-developers on behalf of Brad King" <cmake-developers-bounces at cmake.org on behalf of brad.king at kitware.com> wrote:

>On 09/28/2015 02:34 PM, Stephen Kelly wrote:
>>> Steve?  According to cmake-compile-features(7) you tested this with
>>> Oracle SolarisStudio version 12.4.
>> 
>> Yes, I tested it on SolarisStudio 12.4, but on linux (Ubuntu). Perhaps 
>> that's a relevant difference from 'real' Solaris.
>
>That seems to be the case.  The interaction with C++ runtime library
>selection may differ.
>
>Although we had dashboard builds for SolarisStudio 12.3 on SunOS the
>compiler feature/standard logic is enabled only for SunPro 5.13 and
>above which do not appear until SolarisStudio 12.4.
>
>On 09/28/2015 01:42 PM, Brad King wrote:
>> The logic in cmLocalGenerator::AddCompileOptions that selects the final
>> <LANG>_STANDARD level and adds a flag for it may need to be factored
>> out into a separate step (in Compute?) that selects the level.  Then
>> AddCompileOptions can continue to add the compiler flag and we'll need
>> new code to add link-time compiler-driver flags based on the selected
>> standard level.
>
>Steve, does using <LANG>_STANDARD to put -std= flags on the link line
>seem like the right approach to fix this?
>
>This won't be done before CMake 3.4 so for now we should look at
>turning off all language standard and compile feature support for
>SolarisStudio when not hosted on Linux.
>
>Thanks,
>-Brad
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