[CMake] Comaptibility with older gcc

[Hendrik Sattler]

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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