Date: Tue, 17 Nov 2015 17:58:41 -0500 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Support for out-of-tree build On Tue, Nov 17, 2015 at 10:15:29PM +0000, Petr Hosek wrote: > Absolutely, that's probably the simplest solution in the sense that it > avoids using additional .mk/.sub files or complicated build-time logic. > > If that's the solution we all agree on, I'd be happy to implement this as a > separate patch and then rebase the out-of-tree build patch on top of that. The only concern I'm aware of for this is interaction of the CFI generation scripts with preprocessed asm. They might need to be updated to be able to handle it safely. At present x86[_64] has no need for preprocessing anyway so it's not a pressing issue, but we should probably think through the consequences and make sure we don't get into another situation that's hard to get out of. One idea that came up on irc was that we could shift to doing more of the arch asm with inline asm in C rather than asm source files. This would eliminate most of the need for CFI generation and would yield better LTO results. There are a few files for which this can't be done, however, and I'm not sure everyone likes the idea in principle, though I haven't seen any strong technical reasons not to do it. Rich
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