This option controls the visibility of friend declarations
in C++.
In C++, it controls whether or not the name of a class or
function that is declared only in friend declarations
is visible when using the normal lookup mechanisms.
When friend names are declared, they are
visible to these lookups. When friend names are
not declared as required by the standard, function names are visible
only when using argument-dependent lookup, and class names are never
visible.
Note
The option --friend_injection is provided
only as a migration aid for legacy source code that does not conform
to the C++ standard. Its use is not recommended.
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