Rainer Orth <r...@cebitec.uni-bielefeld.de> writes: > Ian Lance Taylor <i...@google.com> writes: > >> On SVID-based systems, when certain math functions encounter an >> exceptional condition they call a magic function named matherr. That >> function is permitted to change the result which the math functions will >> return. a program is permitted to provide its own version of matherr. >> >> Solaris works this way and at least the Solaris version of matherr does >> not act as Go, or an ordinary interpretation of the function, would >> expect. E.g., calling acos on an out-of-range value will return 0 >> rather than NaN. > > Unfortunately, this breaks the libgo build on Solaris 8 and 9: > > /vol/gcc/src/hg/trunk/local/libgo/runtime/go-matherr.c: In function 'matherr': > /vol/gcc/src/hg/trunk/local/libgo/runtime/go-matherr.c:38:17: error: 'NAN' > undeclared (first use in this function) > /vol/gcc/src/hg/trunk/local/libgo/runtime/go-matherr.c:38:17: note: each > undeclared identifier is reported only once for each function it appears in > /vol/gcc/src/hg/trunk/local/libgo/runtime/go-matherr.c:68:28: error: > 'INFINITY' undeclared (first use in this function) > make[4]: *** [go-matherr.lo] Error 1 > > I couldn't find an appproprite replacement in the system headers.
Oh, wait, we can use __builtin_inf and __builtin_nan. Ian
