[Driver] Add defaults for Android ARM FPUs.

Summary:
Android mandates that devices have at least vfpv3-d16 until
Marshmallow and NEON after that. Still honor the user's decision, but
raise the defaults for Android targets.

Reviewers: srhines, pirama, javed.absar, kristof.beyls, peter.smith

Reviewed By: peter.smith

Subscribers: peter.smith, rengolin, kristof.beyls, chrib, cfe-commits

Differential Revision: https://reviews.llvm.org/D53121

llvm-svn: 344367

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChains/Arch/ARM.cpp b/clang/lib/Driver/ToolChains/Arch/ARM.cpp
index 1ff73ea4fd7..e454a30b61a 100644
--- a/clang/lib/Driver/ToolChains/Arch/ARM.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/ARM.cpp
@@ -378,6 +378,13 @@ void arm::getARMTargetFeatures(const ToolChain &TC,
                       Features);
   } else if (FPUArg) {
     getARMFPUFeatures(D, FPUArg, Args, FPUArg->getValue(), Features);
+  } else if (Triple.isAndroid() && getARMSubArchVersionNumber(Triple) >= 7) {
+    // Android mandates minimum FPU requirements based on OS version.
+    const char *AndroidFPU =
+        Triple.isAndroidVersionLT(23) ? "vfpv3-d16" : "neon";
+    if (!llvm::ARM::getFPUFeatures(llvm::ARM::parseFPU(AndroidFPU), Features))
+      D.Diag(clang::diag::err_drv_clang_unsupported)
+          << std::string("-mfpu=") + AndroidFPU;
   }
 
   // Honor -mhwdiv=. ClangAs gives preference to -Wa,-mhwdiv=.