Date: Sun, 20 Apr 2014 16:31:40 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: static musl-based gdb and -fPIC On Sun, Apr 20, 2014 at 01:03:12PM -0400, writeonce@...ipix.org wrote: > Greetings, > > While building a statically linked musl-based gdb, ld asked that > libc.a be recompiled with -fPIC. This is a bug in the gdb build process. Despite your request for a static gdb, it's trying to build a shared library for something. There's a way to disable it (IIRC --disable-gdbserver is a big hammer that can do it, and there might be a more fine-grained approach) but the real issue is that the build process is broken and doing something that can't work. > After recompiling musl with the > above flag, gdb built successfully. The reason I wanted to have a > static gdb (other than the trivial ones) was to be able to debug a > musl-based python. The distribution's gdb has a dynamic dependency > on a glibc-based libpython, and the two friends don't play well > together. > > Now that the static gdb is up and running, my questions are: > > 1) is there any reason not to "always" compile musl with -fPIC, at > least on x86_64? Compare the .lo and .o files. I think you'll find the .lo files are a considerably more bloated and slower -- not as bad as on 32-bit x86, but still undesirable. Some users will want to use -fPIC even for static linking to be able to produce static PIE binaries, but this is not a mainstream usage (there's not even any official toolchain support for it, just a local hack I posted to the list a year or two back) and not something we would want to impose on everyone. > 2) is there any reason to revert to the old build of libc.so? > Although I rebuilt musl because of libc.a, it turns out that the > -fPIC flag also helped libc.so become much smaller: 699299 bytes, > instead of 2767910 bytes (musl v1.0.0, binutils v2.24). Any other > factors to consider? You must have done something else like disabling debugging info at the same time. Rich
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.