Date: Mon, 4 Jan 2021 12:08:06 -0800 From: Fangrui Song <i@...kray.me> To: musl@...ts.openwall.com Subject: Re: [PATCH] crt: Add .file directive On Fri, Oct 30, 2020 at 1:54 PM Fangrui Song <i@...kray.me> wrote: > > On 2020-10-30, Rich Felker wrote: > >On Fri, Oct 30, 2020 at 11:44:02AM -0700, Khem Raj wrote: > >> Musl linked binaries come out to be not reproducible because > >> absolute build path is seen in debug info of crti.o and crtn.o > >> This is due to the fact that these objects are built from assembly > >> source files and they are missing .file directive > >> if we add .file <filename>.s in them then debug info encodes this > >> value instead of absolute path in debug_line section > > .debug_line is unrelated because there is no .loc directive in these > crti.s and crtn.s files. > > Many architectures do not leave non-STT_SECTION STB_LOCAL symbols in > crti.o and crtn.o, so they don't need to be patched (even if the > maintainer agrees to add the workaround in musl, instead of fixing the > toolchain). > > >Surely there should be some better way to achieve this with CFLAGS > >instead of duplication across every source file..? > > > >Rich > > https://bugs.llvm.org/show_bug.cgi?id=48023 captures the nature of the > problem. You may send a message to binutils@...rceware.org how GCC/gas > should handle this situation. > > LLD and gold do not synthesize STT_FILE, hence no such problem. The binutils action is: GNU ld 2.36 will use the base name (https://sourceware.org/bugzilla/show_bug.cgi?id=26822)
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