From: Natanael Copa <ncopa@alpinelinux.org>
From: Jakub Jirutka <jakub@jirutka.cz>
Date: Sun, 16 Apr 2017 16:49:00 +0100
Subject: [PATCH] Enable stack protector by default for Alpine Linux

--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -4866,6 +4866,13 @@
   CmdArgs.push_back("-lunwind");
 }
 
+unsigned Linux::GetDefaultStackProtectorLevel(bool KernelOrKext) const {
+  StringRef VendorName = Linux::getTriple().getVendorName();
+  if (VendorName.compare("alpine") == 0)
+    return 2;
+  return 1;
+}
+
 /// DragonFly - DragonFly tool chain which can call as(1) and ld(1) directly.
 
 DragonFly::DragonFly(const Driver &D, const llvm::Triple &Triple,
--- a/lib/Driver/ToolChains.h
+++ b/lib/Driver/ToolChains.h
@@ -880,6 +880,7 @@
   void AddIAMCUIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                            llvm::opt::ArgStringList &CC1Args) const override;
   bool isPIEDefault() const override;
+  unsigned GetDefaultStackProtectorLevel(bool KernelOrKext) const override;
   SanitizerMask getSupportedSanitizers() const override;
   void addProfileRTLibs(const llvm::opt::ArgList &Args,
                         llvm::opt::ArgStringList &CmdArgs) const override;
--- a/test/Driver/stack-protector.c
+++ b/test/Driver/stack-protector.c
@@ -24,6 +24,20 @@
 // SSP-ALL: "-stack-protector" "3"
 // SSP-ALL-NOT: "-stack-protector-buffer-size" 
 
+// RUN: %clang -target x86_64-alpine-linux-musl -### %s 2>&1 | FileCheck %s -check-prefix=ALPINE
+// ALPINE: "-stack-protector" "2"
+
+// RUN: %clang -target x86_64-alpine-linux-musl -fstack-protector -### %s 2>&1 | FileCheck %s -check-prefix=ALPINE_SPS
+// ALPINE_SPS: "-stack-protector" "2"
+
+// RUN: %clang -target x86_64-alpine-linux-musl -fstack-protector-all -### %s 2>&1 | FileCheck %s -check-prefix=ALPINE_ALL
+// ALPINE_ALL: "-stack-protector" "3"
+// ALPINE_ALL-NOT: "-stack-protector-buffer-size"
+
+// RUN: %clang -target x86_64-alpine-linux-musl -fno-stack-protector -### %s 2>&1 | FileCheck %s -check-prefix=ALPINE_NOSSP
+// ALPINE_NOSSP-NOT: "-stack-protector"
+// ALPINE_NOSSP-NOT: "-stack-protector-buffer-size"
+
 // RUN: %clang -target x86_64-scei-ps4 -### %s 2>&1 | FileCheck %s -check-prefix=SSP-PS4
 // RUN: %clang -target x86_64-scei-ps4 -fstack-protector -### %s 2>&1 | FileCheck %s -check-prefix=SSP-PS4
 // SSP-PS4: "-stack-protector" "2"