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Merged
merged 3 commits into from
Apr 23, 2023
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Rsundahl/docweakswift5.9 #6699

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6bc3cb2
[sanitizers] Explainer about dyld and weak overrides on Darwin. (NFC)
Mar 23, 2023
8f56d4d
[sanitizers] Simplify Explainer about dyld and weak overrides on Darw…
Apr 4, 2023
b5ae063
Fix LLVM sphinx build
AaronBallman Apr 5, 2023
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15 changes: 15 additions & 0 deletions llvm/docs/ReleaseNotes.rst
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Expand Up @@ -182,6 +182,21 @@ Changes to LLDB

Changes to Sanitizers
---------------------
* For Darwin users that override weak symbols, note that the dynamic linker will
only consider symbols in other mach-o modules which themselves contain at
least one weak symbol. A consequence is that if your program or dylib contains
an intended override of a weak symbol, then it must contain at least one weak
symbol as well for the override to take effect.

Example:

.. code-block:: c

// Add this to make sure your override takes effect
__attribute__((weak,unused)) unsigned __enableOverrides;

// Example override
extern "C" const char *__asan_default_options() { ... }


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