Implement new llc flag -disable-required-unwind-tables.
Corresponds to -fno-unwind-tables (usually default in gcc).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49361 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/DwarfWriter.cpp b/lib/CodeGen/DwarfWriter.cpp
index 947b420..6cdc91e 100644
--- a/lib/CodeGen/DwarfWriter.cpp
+++ b/lib/CodeGen/DwarfWriter.cpp
@@ -2905,8 +2905,11 @@
// If there are no calls then you can't unwind. This may mean we can
// omit the EH Frame, but some environments do not handle weak absolute
- // symbols.
+ // symbols.
+ // If UnwindTablesOptional is not set we cannot do this optimization; the
+ // unwind info is to be available for non-EH uses.
if (!EHFrameInfo.hasCalls &&
+ UnwindTablesOptional &&
((linkage != Function::WeakLinkage &&
linkage != Function::LinkOnceLinkage) ||
!TAI->getWeakDefDirective() ||
@@ -3427,7 +3430,9 @@
shouldEmitTable = true;
// See if we need frame move info.
- if (MMI->hasDebugInfo() || !MF->getFunction()->doesNotThrow())
+ if (MMI->hasDebugInfo() ||
+ !MF->getFunction()->doesNotThrow() ||
+ !UnwindTablesOptional)
shouldEmitMoves = true;
if (shouldEmitMoves || shouldEmitTable)