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[ELF] Do not allocate a byte for an empty class

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In C++, the size of an empty class is 1 rather than 0 because every
object is guaranteed to have a unique address. But if we do not need
the unique address guarantee, we can add `[[no_unique_address]]` to
a class member to save 1 byte. This is a new C++20 feature.
This commit is contained in:
Rui Ueyama 2022-03-06 12:20:30 +09:00
parent a4fd7e3819
commit 9e11b40a99
1 changed files with 1 additions and 1 deletions
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elf/mold.h
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@ -1789,7 +1789,7 @@ public:
u8 referenced_by_regular_obj : 1 = false;
// Target-dependent extra members.
SymbolExtras<E> extra;
[[no_unique_address]] SymbolExtras<E> extra;
};
// If we haven't seen the same `key` before, create a new instance