[llvm-bugs] [Bug 35697] New: Regression(r313729): Assertion `!Old || Old->getCachedLinkage() == D->getCachedLinkage()' failed for external "C" function definition

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https://bugs.llvm.org/show_bug.cgi?id=35697

            Bug ID: 35697
           Summary: Regression(r313729): Assertion `!Old ||
                    Old->getCachedLinkage() == D->getCachedLinkage()'
                    failed for external "C" function definition
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: arphaman at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

The commit r313729 introduced a new `!Old || Old->getCachedLinkage() ==
D->getCachedLinkage()' assertion failure that happens in the following cod e
sample:

extern "C" {

typedef struct {
  int x;
} *ReturnStruct;

ReturnStruct foo(int s);
}

ReturnStruct foo(int s)
{
}


This is similar to existing bugs like
https://bugs.llvm.org/show_bug.cgi?id=33503 but is a new regression in Clang 6.

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