Date: Tue, 28 Apr 2015 09:44:53 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: building musl libc.so with gcc -flto On Mon, Apr 27, 2015 at 11:23:40PM -0700, Andre McCurdy wrote: > On Mon, Apr 27, 2015 at 5:24 PM, Rich Felker <dalias@...c.org> wrote: > > On Mon, Apr 27, 2015 at 05:16:12PM -0700, Andre McCurdy wrote: > >> > OK, it looks like the _dlstart_c symbol got removed before linking the > >> > asm. What about selectively compiling this file with -fno-lto via > >> > something like this in config.mak: > >> > > >> > src/ldso/dlstart.lo: CFLAGS += -fno-lto > >> > >> That works. Should I send a patch? > > > > Yes, but configure would need to detect support for -fno-lto and add > > it appropriately. See what's done for CFLAGS_NOSSP. I suspect the crt > > files also need -fno-lto in principle even if they're not currently > > breaking for lack of it. > > Patch sent. > > I think the crt files might be OK as they are, since the _start_c > symbol isn't being hidden? I think you'll find the exact same thing happens if you use a crt1.o produced from crt1.c for static linking with LTO. Note that on i386 (and x86_64) we still have a crt1.s which overrides crt1.c; I want to remove it at some point. Temporarily removing/renaming it yourself will allow you to test what happens with LTO on this file. Rich
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