[llvm-bugs] [Bug 28149] New: Debug information for type is lost with LTO at -O0

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28149

            Bug ID: 28149
           Summary: Debug information for type is lost with LTO at -O0
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: Wolfgang_Pieb at playstation.sony.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

// After r267296 the following simple example fails to retain debug 
// information for the type 'MyStruct' in the final executable when
// built with LTO. Building with -O2 behaves as expected.

// To build (on native Linux): 
// clang -std=c++11 -O0 -g -flto -c test.cpp 
// clang -flto -o test test.o

// 'llvm-dwarfdump test' shows no information for 'MyStruct'

__attribute__((noinline)) void use(int, int) { }

struct MyStruct {
    int w;
    int x;
    int y;
    int z;

    int foo();
    int bar();
};

int MyStruct::foo() {
    return 3;
}

int main() {
    MyStruct str{1, 2, 3, 4};
    use(str.x, str.y);
    return 0;
}

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