release/20.x: [libc++] Add _LIBCPP_NO_UNIQUE_ADDRESS to flat_{,multi}map::value_compare (#137594) #138880
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@ldionne What do you think about merging this PR to the release branch? |
llvmbot
added
the
libc++
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@llvm/pr-subscribers-libcxx Author: None (llvmbot) ChangesBackport ed0aa99 Requested by: @ldionne Full diff: https://github.com/llvm/llvm-project/pull/138880.diff 2 Files Affected:
diff --git a/libcxx/include/__flat_map/flat_map.h b/libcxx/include/__flat_map/flat_map.h
index a0594ed9dc411..9cc39c0a1e067 100644
--- a/libcxx/include/__flat_map/flat_map.h
+++ b/libcxx/include/__flat_map/flat_map.h
@@ -113,7 +113,7 @@ class flat_map {
class value_compare {
private:
- key_compare __comp_;
+ _LIBCPP_NO_UNIQUE_ADDRESS key_compare __comp_;
_LIBCPP_HIDE_FROM_ABI value_compare(key_compare __c) : __comp_(__c) {}
friend flat_map;
diff --git a/libcxx/include/__flat_map/flat_multimap.h b/libcxx/include/__flat_map/flat_multimap.h
index ea77fb5d79bd2..15fcd7995ad0a 100644
--- a/libcxx/include/__flat_map/flat_multimap.h
+++ b/libcxx/include/__flat_map/flat_multimap.h
@@ -115,7 +115,7 @@ class flat_multimap {
class value_compare {
private:
- key_compare __comp_;
+ _LIBCPP_NO_UNIQUE_ADDRESS key_compare __comp_;
_LIBCPP_HIDE_FROM_ABI value_compare(key_compare __c) : __comp_(__c) {}
friend flat_multimap;
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ldionne
approved these changes
May 7, 2025
github-project-automation
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moved this from Needs Triage
to Needs Merge
in LLVM Release Status
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Can we ignore these failing tests? |
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@ldionne ping. |
1 similar comment
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@ldionne ping. |
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@tstellar The CI failures are most certainly unrelated. |
…pare (llvm#137594) This breaks the ABI of `flat_{,multi}map::value_compare`, but this type has only been introduced in LLVM 20, so it should be very unlikely that we break anybody if we back-port this now. (cherry picked from commit ed0aa99)
github-project-automation
bot
moved this from Needs Merge
to Done
in LLVM Release Status
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@ldionne (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR. |
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Backport ed0aa99
Requested by: @ldionne