Hello Rene ! Thank you for the information given by you . It would be more helpful if you could let me know if there is some document which helps me interpret & understand the " spec " file and tells how it is used by gcc . Thank you very much . Cheers ! --- Rene Herman <rene.herman@keyaccess.nl> wrote: > Anticipating a Reply wrote: > > > In the man page of "dlopen" , > > I came across the gcc compilation > > command :- > > > > gcc -rdynamic -o foo foo.c -ldl > > > > But unfortunately , I found that > > the options are undocumented .i.e. > > " -rdynamic " & " -ldl " could not > > be traced in info & man gcc. > > As to -rdynamic: > > GCC does quite a lot of option > translation/substitution using its > "spec" file. If you type "gcc -v", you will see > something like: > > Reading specs from > /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.2/specs > > That file is a regular ASCII file that you can open > with any viewer > Alternatively, you can have GCC dump the spec file > at you itself using > "gcc -dumpspecs". The format isn't *too* cryptic. > When you search for > -rdynamic in those specs, you will see that GCC > translates that option > into the "-export-dynamic" option to the linker. > "man ld" will now give > you all the info. > > As to -ldl: > > That "option" most certainly *is* documented in "man > gcc" > > === > -llibrary > -l library > Search the library named library when linking. > (The second > alternative with the library as a separate > argument is only > for POSIX compliance and is not recommended.) > === > > That is, you are requesting that gcc link in the > "dl" library > (/lib/libdl.so.2). "man dlopen" for the > documentation on the functions > in that library. > > Rene. > > -- > Kernelnewbies: Help each other learn about the Linux > kernel. > Archive: > http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > ________________________________________________________________________ Missed your favourite TV serial last night? Try the new, Yahoo! TV. visit http://in.tv.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
