Add FIXMEs to all derived classes of std::error_category.

This helps make clear that we're moving away from std::error_code.

Differential Revision: http://reviews.llvm.org/D20592

llvm-svn: 270604

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp b/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
index 550e5494999..2d833204c91 100644
--- a/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
+++ b/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
@@ -556,6 +556,9 @@ std::string getCoverageMapErrString(coveragemap_error Err) {
   llvm_unreachable("A value of coveragemap_error has no message.");
 }
 
+// FIXME: This class is only here to support the transition to llvm::Error. It
+// will be removed once this transition is complete. Clients should prefer to
+// deal with the Error value directly, rather than converting to error_code.
 class CoverageMappingErrorCategoryType : public std::error_category {
   const char *name() const LLVM_NOEXCEPT override { return "llvm.coveragemap"; }
   std::string message(int IE) const override {