Date: Fri, 30 Oct 2020 13:54:16 -0700 From: Fangrui Song <i@...kray.me> To: musl@...ts.openwall.com Subject: Re: [PATCH] crt: Add .file directive 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.
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