> > The gawk source distribution comes with a number of such extensions in the > (doh) extensions/ directory. filefuncs.c is such one extension, which > demonstrate how to add stat() and chdir() capabilities to awk. > The file is compiled into a .so file, which is then referenced from within > gawk to make the extended commands available. > > A vanilla build of gawk does not have any dynamic extension. > > > Now, the Gentoo devs at some point in the past (very early) took that file > (filefuncs.c) and extended it to implement new commands like "symlink", > "unlink", "mkdir", "rmdir" and "stat", so those are callable from within > awk, effectively extending the language. (you can see the Gentoo copyright > in the file, look > into /usr/portage/sys-apps/gawk/files/filefuncs/filefuncs.c) > > There are a number of Gentoo system scripts that use those awk extensions > (look into /lib/rcscripts and /lib/rcscripts/awk), which means that > compiling the expanded filefuncs.c (not the vanilla one) is mandatory on a > Gentoo system, because there are awk scripts that rely on the extended > functionaltiy provided by it. Hence Gentoo maintains the filefuncs.c file > independently, and the gawk ebuild, besides building gawk itself, also takes > care of building filefuncs.c containing the extensions. > >
Thank you very much. That is the best explanation a read to this. It should be deliverd with the sources. Still the procedure is unusual. They could apply a patch to extensions/ filefuncs.c and exclude it for vanilla. I have a second issue. When compiling gawk on Cygwin, where is no windows kernel, the Gentoo version of filefuncs breaks. I have to disable it in the ebuild to get gawk compiled. filefuncs.o:filefuncs.c:(.text+0x1e): undefined reference to `_make_builtin' [... lots of this ... ] filefuncs.o:filefuncs.c:(.text+0x10f1): undefined reference to `_update_ERRNO' collect2: ld returned 1 exit status make: *** [filefuncs.so.0.0.1] Error 1 You say it is mandatory on a Gentoo system, because there are awk scripts that rely on. Do this functions break because of the missing kernel? What would be the workaround? Thanks Al
