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

Summary:
Currently with clang:
$ clang -O20 foo.c
error: invalid value '20' in '-O20'

With the patch:
$ clang -O20 foo.c
warning: optimization level '-O20' is unsupported; using '-O3' instead.
1 warning generated.

This matches the gcc behavior (with a warning added)

Pass all tests:
Testing: 0 .. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
Testing Time: 94.14s
  Expected Passes    : 6721
  Expected Failures  : 20
  Unsupported Tests  : 17

(which was not the case of http://llvm-reviews.chandlerc.com/D2125)

Differential Revision: http://llvm-reviews.chandlerc.com/D2212

llvm-svn: 195009

clang/docs/ReleaseNotes.rst

@@ -77,7 +77,8 @@ New Compiler Flags
 
 - Clang no longer special cases -O4 to enable lto. Explicitly pass -flto to
   enable it.
-- Command line "clang -O3 -flto a.c -c" and "clang -emit-llvm a.c -c" 
+- Clang no longer fails on >= -O5. Uses -O3 instead.
+- Command line "clang -O3 -flto a.c -c" and "clang -emit-llvm a.c -c"
   are no longer equivalent.
 - Clang now errors on unknown -m flags (``-munknown-to-clang``),
   unknown -f flags (``-funknown-to-clang``) and unknown

clang/include/clang/Basic/DiagnosticDriverKinds.td

@@ -113,6 +113,8 @@ def err_drv_unknown_toolchain : Error<
   "cannot recognize the type of the toolchain">;
 
 def warn_O4_is_O3 : Warning<"-O4 is equivalent to -O3">, InGroup<Deprecated>;
+def warn_drv_optimization_value : Warning<"optimization level '%0' is unsupported; using '%1%2' instead.">,
+  InGroup<InvalidCommandLineArgument>;
 def warn_c_kext : Warning<
   "ignoring -fapple-kext which is valid for C++ and Objective-C++ only">;
 def warn_drv_input_file_unused : Warning<

clang/include/clang/Basic/DiagnosticGroups.td

@@ -344,6 +344,7 @@ def UnusedArgument : DiagGroup<"unused-argument">;
 def UnusedSanitizeArgument : DiagGroup<"unused-sanitize-argument">;
 def UnusedCommandLineArgument : DiagGroup<"unused-command-line-argument",
                                           [UnusedSanitizeArgument]>;
+def InvalidCommandLineArgument : DiagGroup<"invalid-command-line-argument">;
 def UnusedComparison : DiagGroup<"unused-comparison">;
 def UnusedExceptionParameter : DiagGroup<"unused-exception-parameter">;
 def UnneededInternalDecl : DiagGroup<"unneeded-internal-declaration">;

clang/lib/Frontend/CompilerInvocation.cpp

@@ -299,14 +299,15 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
   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);
+  // TODO: This could be done in Driver
+  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_optimization_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(

clang/test/Driver/clang_f_opts.c

@@ -110,6 +110,9 @@
 // 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        \

clang/test/Frontend/invalid-o-level.c

@@ -1,4 +1,4 @@
-// RUN: not %clang_cc1 %s -O900 2> %t.log
+// RUN: %clang_cc1 %s -O900 -o /dev/nul 2> %t.log
 // RUN: FileCheck %s -input-file=%t.log
 
-// CHECK: invalid value '900' in '-O900'
+// CHECK: warning: optimization level '-O900' is unsupported; using '-O3' instead.