diff --git a/clang/lib/Driver/ToolChains/PPCLinux.h b/clang/lib/Driver/ToolChains/PPCLinux.h
--- a/clang/lib/Driver/ToolChains/PPCLinux.h
+++ b/clang/lib/Driver/ToolChains/PPCLinux.h
@@ -24,6 +24,11 @@
   AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                             llvm::opt::ArgStringList &CC1Args) const override;
 
+  void
+  addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
+                        llvm::opt::ArgStringList &CC1Args,
+                        Action::OffloadKind DeviceOffloadKind) const override;
+
 private:
   bool SupportIEEEFloat128(const Driver &D, const llvm::Triple &Triple,
                            const llvm::opt::ArgList &Args) const;
diff --git a/clang/lib/Driver/ToolChains/PPCLinux.cpp b/clang/lib/Driver/ToolChains/PPCLinux.cpp
--- a/clang/lib/Driver/ToolChains/PPCLinux.cpp
+++ b/clang/lib/Driver/ToolChains/PPCLinux.cpp
@@ -13,6 +13,7 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 
+using namespace clang::driver;
 using namespace clang::driver::toolchains;
 using namespace llvm::opt;
 using namespace llvm::sys;
@@ -68,6 +69,14 @@
   Linux::AddClangSystemIncludeArgs(DriverArgs, CC1Args);
 }
 
+void PPCLinuxToolChain::addClangTargetOptions(
+    const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args,
+    Action::OffloadKind DeviceOffloadKind) const {
+  if (SupportIEEEFloat128(getDriver(), getTriple(), DriverArgs) &&
+      !DriverArgs.hasArg(options::OPT_mabi_EQ))
+    CC1Args.push_back("-mabi=ieeelongdouble");
+}
+
 bool PPCLinuxToolChain::SupportIEEEFloat128(
     const Driver &D, const llvm::Triple &Triple,
     const llvm::opt::ArgList &Args) const {
diff --git a/clang/test/Driver/ppc-float-abi-warning.cpp b/clang/test/Driver/ppc-float-abi.cpp
rename from clang/test/Driver/ppc-float-abi-warning.cpp
rename to clang/test/Driver/ppc-float-abi.cpp
--- a/clang/test/Driver/ppc-float-abi-warning.cpp
+++ b/clang/test/Driver/ppc-float-abi.cpp
@@ -7,7 +7,13 @@
 // RUN: %clang -### --driver-mode=g++ -target powerpc64le-linux-gnu %s\
 // RUN:  -mabi=ieeelongdouble -stdlib=libc++ -Wno-unsupported-abi 2>&1 | \
 // RUN:  FileCheck %s --check-prefix=NOWARN
+// RUN: %clang -### -target powerpc64le-linux-gnu %s -nostdlib 2>&1 | \
+// RUN:  FileCheck %s --check-prefix=IEEE
+// RUN: %clang -### -target powerpc64le-linux-gnu %s -nostdlib \
+// RUN:  -mabi=ibmlongdouble 2>&1 | FileCheck %s --check-prefix=NOIEEE
 
 // CHECK: warning: float ABI 'ieeelongdouble' is not supported by current library
 // NOWARN-NOT: warning: float ABI 'ieeelongdouble' is not supported by current library
+// IEEE: -mabi=ieeelongdouble
+// NOIEEE-NOT: -mabi=ieeelongdouble
 long double foo(long double x) { return x;  }