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