On Fri, Jun 10, 2016 at 01:42:45PM +0200, Edward Bartolo wrote: > Hi, > > While dissecting the sysvinits (/sbin/init) internals I found that gcc > can link garbage into an executable file. Attempting to run the > resultant garbage results in unknown executable format or something > similar. > > I used the -c directive directly on the source code. The command is this: > gcc -ansi -O2 -W -Wall -D_GNU_SOURCE -c startos.init.c -o startos.init >
It is not gcc "linking garbage into an executable file". With the command above you are not *linking* anything. You are just compiling your .c into a relocatable .o "object file", which contains only the machine code of your program, and nothing else. In orer to transform it to an executable, you should then link it "with some more stuff(tm)", e.g. by using ld. Anyway, the easiest way to obtain an executable is by letting gcc do the linking, at least in this *basic* case. If you just get rid of the "-c" and let gcc handle the rest, you will end up having a proper executable file into "startos.init". HND KatolaZ -- [ ~.,_ Enzo Nicosia aka KatolaZ - GLUGCT -- Freaknet Medialab ] [ "+. katolaz [at] freaknet.org --- katolaz [at] yahoo.it ] [ @) http://kalos.mine.nu --- Devuan GNU + Linux User ] [ @@) http://maths.qmul.ac.uk/~vnicosia -- GPG: 0B5F062F ] [ (@@@) Twitter: @KatolaZ - skype: katolaz -- github: KatolaZ ] _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
