1 files changed, 106 insertions, 0 deletions
diff --git a/lib/Frontend/Warnings.cpp b/lib/Frontend/Warnings.cpp
new file mode 100644
index 0000000..81f75bd
--- /dev/null
+++ b/lib/Frontend/Warnings.cpp
@@ -0,0 +1,106 @@
+//===--- Warnings.cpp - C-Language Front-end ------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Command line warning options handler.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is responsible for handling all warning options. This includes
+// a number of -Wfoo options and their variants, which are driven by TableGen-
+// generated data, and the special cases -pedantic, -pedantic-errors, -w and
+// -Werror.
+//
+// Each warning option controls any number of actual warnings.
+// Given a warning option 'foo', the following are valid:
+//    -Wfoo, -Wno-foo, -Werror=foo
+//
+#include "clang/Frontend/Utils.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Sema/SemaDiagnostic.h"
+#include "clang/Lex/LexDiagnostic.h"
+#include <cstdio>
+#include <cstring>
+#include <utility>
+#include <algorithm>
+using namespace clang;
+
+bool clang::ProcessWarningOptions(Diagnostic &Diags,
+                                  std::vector<std::string> &Warnings,
+                                  bool Pedantic, bool PedanticErrors,
+                                  bool NoWarnings) {
+  Diags.setSuppressSystemWarnings(true);  // Default to -Wno-system-headers
+  Diags.setIgnoreAllWarnings(NoWarnings);
+
+  // If -pedantic or -pedantic-errors was specified, then we want to map all
+  // extension diagnostics onto WARNING or ERROR unless the user has futz'd
+  // around with them explicitly.
+  if (PedanticErrors)
+    Diags.setExtensionHandlingBehavior(Diagnostic::Ext_Error);
+  else if (Pedantic)
+    Diags.setExtensionHandlingBehavior(Diagnostic::Ext_Warn);
+  else
+    Diags.setExtensionHandlingBehavior(Diagnostic::Ext_Ignore);
+  
+  // FIXME: -Wfatal-errors / -Wfatal-errors=foo
+
+  for (unsigned i = 0, e = Warnings.size(); i != e; ++i) {
+    const std::string &Opt = Warnings[i];
+    const char *OptStart = &Opt[0];
+    const char *OptEnd = OptStart+Opt.size();
+    assert(*OptEnd == 0 && "Expect null termination for lower-bound search");
+    
+    // Check to see if this warning starts with "no-", if so, this is a negative
+    // form of the option.
+    bool isPositive = true;
+    if (OptEnd-OptStart > 3 && memcmp(OptStart, "no-", 3) == 0) {
+      isPositive = false;
+      OptStart += 3;
+    }
+
+    // Figure out how this option affects the warning.  If -Wfoo, map the
+    // diagnostic to a warning, if -Wno-foo, map it to ignore.
+    diag::Mapping Mapping = isPositive ? diag::MAP_WARNING : diag::MAP_IGNORE;
+
+    // -Wsystem-headers is a special case, not driven by the option table.  It
+    // cannot be controlled with -Werror.
+    if (OptEnd-OptStart == 14 && memcmp(OptStart, "system-headers", 14) == 0) {
+      Diags.setSuppressSystemWarnings(!isPositive);
+      continue;
+    }
+    
+    // -Werror/-Wno-error is a special case, not controlled by the option table.
+    // It also has the "specifier" form of -Werror=foo and -Werror-foo.
+    if (OptEnd-OptStart >= 5 && memcmp(OptStart, "error", 5) == 0) {
+      const char *Specifier = 0;
+      if (OptEnd-OptStart != 5) {  // Specifier must be present.
+        if ((OptStart[5] != '=' && OptStart[5] != '-') ||
+            OptEnd-OptStart == 6) {
+          fprintf(stderr, "warning: unknown -Werror warning specifier: -W%s\n",
+                  Opt.c_str());
+          continue;
+        }
+        Specifier = OptStart+6;
+      }
+      
+      if (Specifier == 0) {
+        Diags.setWarningsAsErrors(true);
+        continue;
+      }
+      
+      // -Werror=foo maps foo to Error, -Wno-error=foo maps it to Warning.
+      Mapping = isPositive ? diag::MAP_ERROR : diag::MAP_WARNING_NO_WERROR;
+      OptStart = Specifier;
+    }
+    
+    if (Diags.setDiagnosticGroupMapping(OptStart, Mapping))
+      fprintf(stderr, "warning: unknown warning option: -W%s\n", Opt.c_str());
+  }
+  
+  return false;
+}