https://bugs.llvm.org/show_bug.cgi?id=41817
Bug ID: 41817
Summary: The linkage changes in r359260 break MIDL code
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: dma...@mozilla.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
The following code builds successfully with r359259 but not r359260:
$ cat a.cpp
extern const int x;
static const int x = 3;
const int* foo() { return &x; }
$ cat b.cpp
extern const int x;
static const int x = 7;
const int* bar() { return &x; }
$ cat c.cpp
const int* foo();
const int* bar();
int main(int argc, char**) { return argc ? *foo() : *bar(); }
$ clang-cl -c a.cpp b.cpp c.cpp
$ lld-link -nodefaultlib -entry:main a.obj b.obj c.obj
lld-link: error: duplicate symbol: int const x in a.obj and in b.obj
This pattern can be seen in code generated by MIDL, e.g.
https://searchfox.org/mozilla-central/search?q=text%3AHandlerData__MIDL_ProcFormatString
Since there are no templates involved here, I'm guessing this change in
behavior was unintended?
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