[Driver][Darwin] Do not pass -munwind-table if -fno-excpetions is

supplied.

With this change, -fno-exceptions disables unwind tables unless
-funwind-tables is supplied too or the target is x86-64 (x86-64 requires
emitting unwind tables).

rdar://problem/33934446

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@311397 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/Driver/ToolChains/Darwin.cpp b/lib/Driver/ToolChains/Darwin.cpp
index f67e36ef63..84d684c05b 100644
--- a/lib/Driver/ToolChains/Darwin.cpp
+++ b/lib/Driver/ToolChains/Darwin.cpp
@@ -1845,7 +1845,12 @@ Darwin::TranslateArgs(const DerivedArgList &Args, StringRef BoundArch,
 }
 
 bool MachO::IsUnwindTablesDefault(const ArgList &Args) const {
-  return !UseSjLjExceptions(Args);
+  // Unwind tables are not emitted if -fno-exceptions is supplied (except when
+  // targeting x86_64).
+  return getArch() == llvm::Triple::x86_64 ||
+         (!UseSjLjExceptions(Args) &&
+          Args.hasFlag(options::OPT_fexceptions, options::OPT_fno_exceptions,
+                       true));
 }
 
 bool MachO::UseDwarfDebugFlags() const {