[llvm-bugs] [Bug 42177] New: Update documentation on linking DSOs with -fsanitize=address

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42177

            Bug ID: 42177
           Summary: Update documentation on linking DSOs with
                    -fsanitize=address
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dilyan.palauzov at aegee.org
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Per https://github.com/google/sanitizers/issues/1086 update
https://clang.llvm.org/docs/AddressSanitizer.html to state, that:

- Linking DSOs with -fsanitize=address does nothing.
- Linking DSOs with -fsanitize=address -libsan-shared helps with the undefined
symbols for the linker, by adding a DL_NEEDED entry, but at run time this entry
is not used: the symbols have to be loaded either within the executable, or the
asan-runtime has to be loaded with LD_PRELOAD
- Discourage the use of -fsanitize=address -libsan-static, as it is not
documented

The statement “ When linking shared libraries, the AddressSanitizer run-time is
not linked, so -Wl,-z,defs may cause link errors (don’t use it with
AddressSanitizer).” is not correct, when -libsan-shared is used.

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