Based on various research into C99 & various libm implementations, it seems that the dragonfly libm is missing a few functions available elsewhere, including but not limited to:
- trunc, truncf - nan, nanf, nanl - log2 log2f ... Discussion started based on missing trunc() function, noted to be in C99 section 7.12.9.8: "The trunc functions round their argument to the integer value, in floating format, nearest to but no larger in magnitude than the argument." The functions listed above were added to NetBSD's library since the DragonFly copy was merged, as of the versions below: http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libm/shlib_version (available, $NetBSD$ v1.8) although based on a quick glance at: http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libm/src/s_floor.c (available, $NetBSD$ v1.11) http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libm/src/s_trunc.c (available, $NetBSD$ v1.2) http://www.netlib.org/fdlibm/fdlibm.h (not-available, /* @(#)fdlibm.h 1.5 04/04/22 */ ) and http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/msun/src/s_trunc.c (available, $FreeBSD$ v1.1) It looks like trunc() was a fresh implementeation for FBSD 5 using a similar structure (and misnamed header) from the s_floor.c which was subsequently brought in to netbsd since 3.x release According to Matt, Gnu seems to have a clean 4-line implementation done in 2005: http://gcc.gnu.org/ml/fortran/2005-05/msg00227.html Ideally the 'fix' would implement most or all of C99's math functions, perhaps more realistically implementing a subset and documenting the current level of coverage
