Move clang-cc.h to lib/Frontend/Utils.h, and move the associated .cpp
files to lib/Frontend.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72099 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/Warnings.cpp b/lib/Frontend/Warnings.cpp
new file mode 100644
index 0000000..8d6ca68
--- /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 "llvm/Support/CommandLine.h"
+#include <cstdio>
+#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;
+}