| From: Caroline Tice <cmtice@google.com> |
| |
| This is a temporary workaround. Currently LLVM generates Dwarf version |
| 4 for all of its debug information, including its Debug Frames (CIE) |
| information. Breakpad cannot handle Dwarf Version 4 (see |
| https://bugs.chromium.org/p/chromium/issues/detail?id=614788). We |
| tried reducing all of the Dwarf information to version 3, but that |
| causes problems with Fission (the splitting of debug information into |
| separate files), which requires the Dwarf DIEs to be emitted at |
| version 4. This patch works around that issue by forcing the Debug |
| Frames version of Dwarf to be version 1, while leaving the rest of the |
| Dwarf data at version 4. When the replacement for Breakpad comes out |
| we will no longer need this patch, as that is supposed to be able to |
| handle version 4 frames information. |
| |
| index 759f90e..d536397 100644 |
| --- a/llvm/lib/MC/MCDwarf.cpp |
| +++ b/llvm/lib/MC/MCDwarf.cpp |
| @@ -1252,7 +1252,8 @@ static unsigned getCIEVersion(bool IsEH, unsigned DwarfVersion) { |
| return 3; |
| case 4: |
| case 5: |
| - return 4; |
| + return 1; |
| + // return 4; Temporarily disable as workaround for Breakpad issue |
| } |
| llvm_unreachable("Unknown version"); |
| } |
