[PATCH] Using an invalid -O falls back on -O3 instead of an error

[Sylvestre Ledru]

  Taking in account Hal & Renato comments. Thanks

http://llvm-reviews.chandlerc.com/D2125

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2125?vs=5413&id=5438#toc

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/Driver/clang_f_opts.c

Index: include/clang/Basic/DiagnosticDriverKinds.td
===================================================================
--- include/clang/Basic/DiagnosticDriverKinds.td
+++ include/clang/Basic/DiagnosticDriverKinds.td
@@ -113,6 +113,7 @@
   "cannot recognize the type of the toolchain">;
 
 def warn_O4_is_O3 : Warning<"-O4 is equivalent to -O3">, InGroup<Deprecated>;
+def warn_drv_invalid_value : Warning<"optimization level '%0' is unsupported; using '%1%2' instead.">;
 def warn_c_kext : Warning<
   "ignoring -fapple-kext which is valid for C++ and Objective-C++ only">;
 def warn_drv_input_file_unused : Warning<
Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp
+++ lib/Driver/Tools.cpp
@@ -2727,7 +2727,7 @@
   // preprocessed inputs and configure concludes that -fPIC is not supported.
   Args.ClaimAllArgs(options::OPT_D);
 
-  // Manually translate -O4 to -O3; let clang reject others.
+  // Manually translate -O4 to -O3; let clang fall back on -O3 for others
   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
     if (A->getOption().matches(options::OPT_O4)) {
       CmdArgs.push_back("-O3");
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -299,14 +299,14 @@
   using namespace options;
   bool Success = true;
 
-  unsigned OptLevel = getOptimizationLevel(Args, IK, Diags);
-  if (OptLevel > 3) {
-    Diags.Report(diag::err_drv_invalid_value)
-      << Args.getLastArg(OPT_O)->getAsString(Args) << OptLevel;
-    OptLevel = 3;
-    Success = false;
+  Opts.OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
+  unsigned MaxOptLevel = 3;
+  if (Opts.OptimizationLevel > MaxOptLevel) {
+    // If the optimization level is not supported, fall back on the default optimization
+    Diags.Report(diag::warn_drv_invalid_value)
+        << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
+    Opts.OptimizationLevel = MaxOptLevel;
   }
-  Opts.OptimizationLevel = OptLevel;
 
   // We must always run at least the always inlining pass.
   Opts.setInlining(
Index: test/Driver/clang_f_opts.c
===================================================================
--- test/Driver/clang_f_opts.c
+++ test/Driver/clang_f_opts.c
@@ -100,6 +100,9 @@
 // CHECK-MAX-O: warning: -O4 is equivalent to -O3
 // CHECK-MAX-O: -O3
 
+// RUN: %clang -### -S -O20 %s 2>&1 | FileCheck -check-prefix=CHECK-INVALID-O %s
+// CHECK-INVALID-O: warning: optimization level '-O20' is unsupported; using '-O3' instead.
+
 // Test that we don't error on these.
 // RUN: %clang -### -S -Werror                                                \
 // RUN:     -falign-functions -falign-functions=2 -fno-align-functions        \
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