[llvm-bugs] [Bug 29086] New: Clang didn't emit the right debug information for vla a[3][m]

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29086

            Bug ID: 29086
           Summary: Clang didn't emit the right debug information for vla
                    a[3][m]
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: qshanz at cn.ibm.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

> cat a.C
int m;

int main() {
int a[3][m];
return a[0][0];
}

> clang++ a.C -g -S -emit-llvm
> cat a.ll
 call void @llvm.dbg.declare(metadata i32* %7, metadata !14, metadata !18),
!dbg !19
!14 = !DILocalVariable(name: "a", scope: !9, file: !1, line: 4, type: !15)
!15 = !DICompositeType(tag: DW_TAG_array_type, baseType: !5, align: 32,
elements: !16)
!16 = !{!17, !17}
!17 = !DISubrange(count: -1)
> clang -v
clang version 4.0.0 (trunk)

Note that, clang emit both two subrange as "-1" which is not right. It should
be "3" and "-1".

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