Date: Fri, 19 Nov 2021 15:00:55 -0500 From: Rich Felker <dalias@...c.org> To: Matt Andrews <mattandrews@...il.com> Cc: musl@...ts.openwall.com Subject: Re: Why does musl require another libc to be built (noob question) You dropped the list on your reply so I re-sent your mail to the list on CC. On Fri, Nov 19, 2021 at 10:16:30AM +1100, Matt Andrews wrote: > So if there is no dependency on another libc, then the only ‘dependency’ > musl would have is some compiler runtime? If the compiler generates calls to its own library functions as part of implementing language constructs (e.g. 64-bit division, floating point on softfloat archs, etc.) then you need this library code. This is libgcc.a or compiler_rt. > I see in the source there is a ‘crt’ folder. Is that musl’s compiler > runtime? No, these are the sources for the entry point object files linked into every program as opposed to part of the library. > On Fri, 19 Nov 2021 at 09:31, Matt Andrews <mattandrews@...il.com> wrote: > > > Oh. I read somewhere that some syscalls like abort require an > > implementation that is picked up from some other libc. > > > > On Fri, 19 Nov 2021 at 08:40, Rich Felker <dalias@...c.org> wrote: > > > >> On Fri, Nov 19, 2021 at 08:28:54AM +1100, Matt Andrews wrote: > >> > Lately I’ve been trying to cross compile musl with clang. It’s been a > >> > really interesting process and everyone on this list has been really > >> > helpful. > >> > > >> > I hope this isn’t too much of a silly question, but there’s a missing > >> piece > >> > to my understanding of the standard library and that is why you need > >> > another libc to build it. I assumed that it is a self contained thing, > >> > everything else depends on it. > >> > > >> > I’m sure there are very good reasons for needing another standard > >> library > >> > to build musl, but I’m not sure what they are and if anyone could let me > >> > know that would greatly appreciated. > >> > >> It doesn't and I'm not sure where you got that idea. Can you explain > >> what you mean? > >> > >> Rich > >> > >
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