[PATCH] D127612: [BOLT][NFC] Forward declare ReorderBlocks for MSVC19

[Amir Ayupov via Phabricator via llvm-commits]

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Fix bolt-x86_64-wine-msvc builder:
https://lab.llvm.org/buildbot/#/builders/222/builds/1154


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127612

Files:
  bolt/lib/Passes/BinaryPasses.cpp


Index: bolt/lib/Passes/BinaryPasses.cpp
===================================================================
--- bolt/lib/Passes/BinaryPasses.cpp
+++ bolt/lib/Passes/BinaryPasses.cpp
@@ -147,6 +147,9 @@
                     cl::desc("dump CFG of functions with unknown control flow"),
                     cl::cat(BoltCategory), cl::ReallyHidden);
 
+// Please MSVC19 with a forward declaration: otherwise it reports an error about
+// an undeclared variable inside a callback.
+extern cl::opt<bolt::ReorderBasicBlocks::LayoutType> ReorderBlocks;
 cl::opt<bolt::ReorderBasicBlocks::LayoutType> ReorderBlocks(
     "reorder-blocks", cl::desc("change layout of basic blocks in a function"),
     cl::init(bolt::ReorderBasicBlocks::LT_NONE),


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