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On Wednesday, June 30, 2010 06:21:51 Vladimir Simonov wrote: > I have ELF executable (EXE) dynamically linked with DSO (SO) on > some dos-like OS with ELF support. Some symbol A (FUNC GLOBAL DEFAULT) > is referenced only from SO(not from EXE itself). After link > (by ld, binutils 2.20.1) EXE contains info about symbol A only > in DYNSYM table. There is nothing about A in SYMTAB and .rel.text. > As result our runtime linker is unable to find symbol A during SO > loading. If I reference A from EXE, A appears in SYMTAB, DYNSYM > and .rel.text and runtime works OK. > > Questions: > 1. Must symbol A be in SYMTAB and .rel.text if it is not > referenced from EXE directly? By other words, is the problem > in ld or in runtime linker? > 2. If the problem is in runtime linker, then is it possible > to force such records creation without explicit reference on A > from EXE sources? Via ld's version-script, may be options... your ldso should be using DT_STRTAB and DT_SYMTAB for the strtab and dynsym sections. you shouldnt be relying on named sections to find the symbol table. to speak to common ELF conventions, .dyn{str,sym} contain only the important symbol references. the .{sym,str}tab sections contain extended debug info and are usually stripped from "released" ELFs. -mike
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