From: Akira Hatanaka <ahatanaka@apple.com>
Date: Mon, 21 Aug 2017 22:46:46 +0000 (+0000)
Subject: [Driver][Darwin] Do not pass -munwind-table if -fno-excpetions is
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f4e3d63a31ea539b2afe20cd314ea3842b28dd51;p=clang

[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
---

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 {
diff --git a/test/Driver/clang-translation.c b/test/Driver/clang-translation.c
index 545951d5aa..3b30f7af76 100644
--- a/test/Driver/clang-translation.c
+++ b/test/Driver/clang-translation.c
@@ -73,6 +73,10 @@
 // RUN: FileCheck -check-prefix=ARM64-APPLE %s
 // ARM64-APPLE: -munwind-table
 
+// RUN: %clang -target arm64-apple-ios10 -fno-exceptions -### -S %s -arch arm64 2>&1 | \
+// RUN: FileCheck -check-prefix=ARM64-APPLE-EXCEP %s
+// ARM64-APPLE-EXCEP-NOT: -munwind-table
+
 // RUN: %clang -target armv7k-apple-watchos4.0 -### -S %s -arch armv7k 2>&1 | \
 // RUN: FileCheck -check-prefix=ARMV7K-APPLE %s
 // ARMV7K-APPLE: -munwind-table