glandium added a comment.

This broke the gold plugin:

  [task 2022-11-22T21:03:29.486Z] 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1108:19: 
error: no matching function for call to 'localCache'
  [task 2022-11-22T21:03:29.486Z]     Cache = check(localCache("ThinLTO", 
"Thin", options::cache_dir, AddBuffer));
  [task 2022-11-22T21:03:29.487Z]                   ^~~~~~~~~~
  [task 2022-11-22T21:03:29.487Z] 
/builds/worker/fetches/llvm-project/llvm/include/llvm/Support/Caching.h:72:21: 
note: candidate function not viable: no known conversion from '(lambda at 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1102:20)' 
to 'llvm::AddBufferFn' (aka 'function<void (unsigned int, const llvm::Twine &, 
std::unique_ptr<MemoryBuffer>)>') for 4th argument
  [task 2022-11-22T21:03:29.487Z] Expected<FileCache> localCache(
  [task 2022-11-22T21:03:29.488Z]                     ^
  [task 2022-11-22T21:03:29.488Z] 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1110:18: 
error: no viable conversion from '(lambda at 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1094:20)' 
to 'llvm::AddStreamFn' (aka 
'function<Expected<std::unique_ptr<CachedFileStream>> (unsigned int, const 
llvm::Twine &)>')
  [task 2022-11-22T21:03:29.488Z]   check(Lto->run(AddStream, Cache));
  [task 2022-11-22T21:03:29.488Z]                  ^~~~~~~~~
  [task 2022-11-22T21:03:29.488Z] 
/builds/worker/fetches/sysroot/usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/std_function.h:421:7:
 note: candidate constructor not viable: no known conversion from '(lambda at 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1094:20)' 
to 'std::nullptr_t' (aka 'nullptr_t') for 1st argument
  [task 2022-11-22T21:03:29.488Z]       function(nullptr_t) noexcept
  [task 2022-11-22T21:03:29.488Z]       ^
  [task 2022-11-22T21:03:29.489Z] 
/builds/worker/fetches/sysroot/usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/std_function.h:432:7:
 note: candidate constructor not viable: no known conversion from '(lambda at 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1094:20)' 
to 'const std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, 
std::default_delete<llvm::CachedFileStream>>> (unsigned int, const llvm::Twine 
&)> &' for 1st argument
  [task 2022-11-22T21:03:29.489Z]       function(const function& __x);
  [task 2022-11-22T21:03:29.489Z]       ^
  [task 2022-11-22T21:03:29.489Z] 
/builds/worker/fetches/sysroot/usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/std_function.h:441:7:
 note: candidate constructor not viable: no known conversion from '(lambda at 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1094:20)' 
to 'std::function<llvm::Expected<std::unique_ptr<llvm::CachedFileStream, 
std::default_delete<llvm::CachedFileStream>>> (unsigned int, const llvm::Twine 
&)> &&' for 1st argument
  [task 2022-11-22T21:03:29.489Z]       function(function&& __x) noexcept : 
_Function_base()
  [task 2022-11-22T21:03:29.489Z]       ^
  [task 2022-11-22T21:03:29.489Z] 
/builds/worker/fetches/sysroot/usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/std_function.h:465:2:
 note: candidate template ignored: substitution failure [with _Functor = 
(lambda at 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1094:20), 
$1 = void]: no type named 'type' in 'std::result_of<(lambda at 
/builds/worker/fetches/llvm-project/llvm/tools/gold/gold-plugin.cpp:1094:20) 
&(unsigned int, const llvm::Twine &)>'
  [task 2022-11-22T21:03:29.489Z]         function(_Functor);
  [task 2022-11-22T21:03:29.489Z]         ^
  [task 2022-11-22T21:03:29.489Z] 
/builds/worker/fetches/llvm-project/llvm/include/llvm/LTO/LTO.h:278:25: note: 
passing argument to parameter 'AddStream' here
  [task 2022-11-22T21:03:29.489Z]   Error run(AddStreamFn AddStream, FileCache 
Cache = nullptr);
  [task 2022-11-22T21:03:29.489Z]                         ^
  [task 2022-11-22T21:03:29.489Z] 2 errors generated.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D137217/new/

https://reviews.llvm.org/D137217

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