supported version of glibc, workarround to gnulib and math constant module

[Bastien ROUCARIES]

Hi,

I am trying to port harminv to gnulib.

However this package has the following code in order to work arround a
weird bug in glibc 2.2.5. Do you support this lib ?

If you use the complex clog function in a pure c program library than
link from another (C++) program, the program seems to crash from this
c++ program. It seems related to
a conflict between class clog of c++ and function clog. Upstream of
harminv use the following workarround:
#undef clog
#define clog my_clog

static cmplx my_clog(cmplx z)
{
     return (log(cabs(z)) + I * carg(z));
}

Does this kind of workarround is suitable for gnulib ?

Another question do you accept a package a math constant like for
instance M_PI and other constant? It will be really useful for math
and physics program to get a resonnable loist of math constant by
default.

Bastien