[patch] Adjust behavior of FDE cross-section relocs for targets that don't support abs-differences.
Modern versions of OSX/Darwin's ld (ld64 > 97.17) have an optimisation present that allows the back end to omit relocations (and replace them with an absolute difference) for FDE some text section refs.
This patch allows a backend to opt-in to this behaviour by setting "DwarfFDESymbolsUseAbsDiff". At present, this is only enabled for modern x86 OSX ports.
test changes by David Fang.
llvm-svn: 198744
diff --git a/llvm/lib/MC/MCAsmInfo.cpp b/llvm/lib/MC/MCAsmInfo.cpp
index 466a94d..2c19e85 100644
--- a/llvm/lib/MC/MCAsmInfo.cpp
+++ b/llvm/lib/MC/MCAsmInfo.cpp
@@ -84,6 +84,7 @@
SupportsDebugInformation = false;
ExceptionsType = ExceptionHandling::None;
DwarfUsesRelocationsAcrossSections = true;
+ DwarfFDESymbolsUseAbsDiff = false;
DwarfRegNumForCFI = false;
NeedsDwarfSectionOffsetDirective = false;
UseParensForSymbolVariant = false;