https://bugs.llvm.org/show_bug.cgi?id=41776
Bug ID: 41776
Summary: Using __attribute__((weak,dllimport)) results in clang
generating invalid IR
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: r...@google.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Consder:
int __attribute__((weak, dllimport)) my_weak(int x); // { return x; }
int main() {
if (my_weak)
my_weak(0);
return 13;
}
$ clang -cc1 -triple x86_64-windows-msvc t.c -S -o t.s
Global is marked as dllimport, but not external
i32 (i32)* @my_weak
fatal error: error in backend: Broken module found, compilation aborted!
Stack dump:
0. Program arguments: C:\src\llvm-project\build\bin\clang.exe -cc1 -triple
x86_64-windows-msvc t.c -S -o t.s
1. <eof> parser at end of file
2. Per-function optimization
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