aafad2d214
When the top of the instantiation stack is in user code. The goal of this PR is to allow deprecation of some char_traits specializations in libc++ as done in https://reviews.llvm.org/D157058 which was later reverted by https://github.com/llvm/llvm-project/pull/66153#issuecomment-1719578384 as Clang never emitted the libc++ warnings. Because Clang likes to eagerly instantiate, we can look for the location of the top of the instantiation stack, and emit a warning if that location is in user code. The warning emission is forced by temporarily instructing the diag engine not to silence warning in system headers.
29 lines
784 B
C++
29 lines
784 B
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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#ifdef BE_THE_HEADER
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#pragma clang system_header
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template <typename T>
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struct traits;
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template <>
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struct [[deprecated]] traits<int> {}; // expected-note {{'traits<int>' has been explicitly marked deprecated here}}
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template<typename T, typename Trait = traits<T>> // expected-warning {{'traits<int>' is deprecated}}
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struct basic_string {};
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// should not warn, defined and used in system headers
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using __do_what_i_say_not_what_i_do = traits<int> ;
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template<typename T, typename Trait = traits<double>>
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struct should_not_warn {};
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#else
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#define BE_THE_HEADER
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#include __FILE__
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basic_string<int> test1; // expected-note {{in instantiation of default argument for 'basic_string<int>' required here}}
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should_not_warn<int> test2;
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#endif
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