[CMake] Comaptibility with older gcc

[Michele Portolan]

Thanks for all the feedback.

I cannot go into the details, but the deployment target is a production 
machine for which I have no installation privileges, and where 
"stability is king", so asking for updates is out of the question. I am 
offered an Eclispe environment and have to work on it, hence my idea of 
importing the cmake-built library (static or dynamic, whichever works 
better) into the Eclipse projet and include it.

I was also doubting about libstdc++ versions, is there maybe a way of 
asking Cmake to statistically include it in the built library?

Regards,


Michele


Le 27/01/2017 à 19:08, Hendrik Sattler a écrit :
> If the target platform has an adapted gcc  that does not match upstream gcc, or may not be possible to just compile a newer version. Or it is a discontinued arch.
>
>
> Am 27. Januar 2017 19:05:09 MEZ schrieb "Elizabeth A. Fischer" <elizabeth.fischer at columbia.edu>:
>> C++ code is not compatible between different compilers.  You cannot
>> link
>> C++ code built with GCC 4.9.3 with GCC 4.2.1.  Maybe if you hack around
>> and
>> find the GNU C++ libraries from your GCC 4.9.3 installation... just
>> maybe,
>> with enough hacking, it will work.  But in general, this is a rabbit
>> hole
>> that will offer you very little in the end.
>>
>> The standard way to build on systems that don't have the compilers you
>> need
>> is... to get the compilers you need.  My point was that getting these
>> compilers is actually not very hard.  In the end, that will almost
>> certainly be the easiest solution to your problem.
>>
>>
>> On Fri, Jan 27, 2017 at 12:58 PM, Hendrik Sattler
>> <post at hendrik-sattler.de>
>> wrote:
>>
>>> Your answer is totally unrelated to the question.
>>>
>>> Am 27. Januar 2017 18:23:39 MEZ schrieb "Elizabeth A. Fischer" <
>>> elizabeth.fischer at columbia.edu>:
>>>> Get spack, then use it to build GCC 4.9.3  takes a couple hours of
>> wall
>>>> time, five minutes of your time.
>>>>
>>>> Github.com/llnl/spack
>>>> On Jan 27, 2017 12:04 PM, "Michele Portolan" <
>>>> michele.portolan at grenoble-inp.fr> wrote:
>>>>
>>>>> I have a project that build correctly using gcc 4.9.3, generating
>> a
>>>>> dynamic library that I can later link to obtain my executables.
>> So,
>>>> nothing
>>>>> special.
>>>>>
>>>>> My problem is that on one of my target systems, I only have a gcc
>>>> 4.1.2
>>>>> and I am forced to use it for at least  linking the last
>> executable.
>>>> My
>>>>> project uses extensively C++14,so I cannot build it with the older
>>>> gcc.
>>>>> Is there a way to have Cmake generate a library that is compatible
>>>> with
>>>>> gcc 4.1.2?
>>>>>
>>>>> Regards,
>>>>>
>>>>>
>>>>> Michele
>>>>> --
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