[Lldb-commits] [lldb] r321271 - Work around test failures on red-hat linux

Pavel Labath via lldb-commits lldb-commits at lists.llvm.org
Thu Dec 21 08:50:13 PST 2017

That's great, thanks for the explanation. I'll look into that.

On 21 December 2017 at 16:34, Greg Clayton <clayborg at gmail.com> wrote:
> On Dec 21, 2017, at 7:24 AM, Pavel Labath via lldb-commits
> <lldb-commits at lists.llvm.org> wrote:
> On 21 December 2017 at 15:17, Pavel Labath <labath at google.com> wrote:
> Right now I'm looking at two (ignoring the debug-info multiplication):
> TestExprs2.py and TestTopLevelExprs.py
> TestExprs2 is encountering ambiguity when looking up the "environ"
> symbol (the dynamic linker contains an extra copy). I think I know how
> to handle that.
> Ok, I take that back. I was hoping I could just implement
> ObjectFileELF::GetIsDynamicLinkEditor, but it seems that function is
> not actually called from anywhere.
> Does anyone have more background about that function?
> dyld on MacOS has exported functions like "malloc", and "free" and many many
> others that mirror libc function needed to bootstrap dyld before it has
> actually loaded libc into the process. When someone types "b malloc" on the
> lldb command line, we would end up setting breakpoints in both dyld and in
> libc which isn't what the user wanted. This flag is was used to say "this
> library defines many functions that are similar to other libraries, but no
> one wants to actually stop in these". This used to be used in:
> Platform::ModuleIsExcludedForUnconstrainedSearches(...)
> This is a function that says "for my platform, don't include this library in
> global searches. We eventually added ObjectFile::GetType() which can return
> ObjectFile::eTypeDynamicLinker. This is what is currently used in
> PlatformDarwin::ModuleIsExcludedForUnconstrainedSearches(...) to avoid dyld
> when doing global searches.
> So it might be as simple as making sure that the dynamic linker shared
> ObjectFile returns ObjectFile::eTypeDynamicLinker and then adding
> PlatformPosix::ModuleIsExcludedForUnconstrainedSearches(...) that does
> something similar to
> PlatformDarwin::ModuleIsExcludedForUnconstrainedSearches(...).
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