Re: How to compile (Linux, Debian or Ubuntu, x86-64) FOX toolkit (snapshot) with -g and -O2 [RefPerSys]

On 01/04/2022 14:08, Basile Starynkevitch wrote:
>
> Hello all,
>
> As you probably know,  on recent Linux distributions the recent GCC 
> <https://gcc.gnu.org/> or Clang <https://clang.llvm.org/> compilers 
> can be invoked with both -O2 and -g (or even -g3)
>
> For the *RefPerSys* project (symbolic AI, open source, GPLv3+; see 
> *http://refpersys.org/* <http://refpersys.org/> and source code on 
> https://github.com/RefPerSys/RefPerSys ...) we are considering using 
> FOX toolkit, but we need DWARF debugging information for several 
> important reasons:
>
>
>   * manual debugging with GDB at first.
>   * generation (at "runtime") of C++ code compiled to some dlopen
>     <https://man7.org/linux/man-pages/man3/dlopen.3.html>-ed plugin.
>     The generated C++ code would depend upon some rules entered thru
>     the FOX graphical user interface
>   * software introspection  and runtime reflection using Ian Lance
>     Taylor libbacktrace
>     <https://github.com/ianlancetaylor/libbacktrace> combioned with
>     dladdr <https://man7.org/linux/man-pages/man3/dladdr.3.html>.
>   * Hopefully, homoiconicity
>     <https://en.wikipedia.org/wiki/Homoiconicity> of the /RefPerSys/
>     system and rule language
>
>
> I tried several times to configure FOX source tree /fox-1.7.80/ using 
> ./configure --enable-debug CFLAGS='-O2 -g3' CXXFLAGS='-O2 -g3' but the 
> compilation of FOX did not show any -O flag.
>
> This is on Ubuntu 21.10, with g++ being GCC 11.1
>


It seems (I am not sure) that using make CXXFLAGS='-O2 -g3' in FOX 
toolkit source tree solved the problem.


I am unhappy of that ugly way to solve  it.


So, a better solution is welcome.


Thanks

-- 
Basile Starynkevitch<[email protected]>
(only mine opinions / les opinions sont miennes uniquement)
92340 Bourg-la-Reine, France
web page: starynkevitch.net/Basile/

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