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

Hello all,

As you probably know,  on recent Linux distributions the recent GCC 
<https://gcvc.gnu.org/> or Clang 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


What am I doing wrong?


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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