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8480d420d3
Summary: Provide more information on usage in -help Test Plan: ran once Reviewers: klimek, chandlerc, djasper Reviewed By: klimek CC: cfe-commits Differential Revision: http://llvm-reviews.chandlerc.com/D5 llvm-svn: 160132
85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
//===- examples/Tooling/ClangCheck.cpp - Clang check tool -----------------===//
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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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// This file implements a clang-check tool that runs the
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// clang::SyntaxOnlyAction over a number of translation units.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/CommandLine.h"
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#include "clang/Frontend/FrontendActions.h"
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#include "clang/Tooling/CompilationDatabase.h"
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#include "clang/Tooling/Tooling.h"
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using namespace clang::tooling;
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using namespace llvm;
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cl::opt<std::string> BuildPath(
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"p",
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cl::desc("<build-path>"),
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cl::Optional);
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cl::list<std::string> SourcePaths(
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cl::Positional,
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cl::desc("<source0> [... <sourceN>]"),
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cl::OneOrMore);
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static cl::extrahelp MoreHelp(
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"\n"
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"<build-path> is used to read a compile command database.\n"
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"\n"
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"For example, it can be a CMake build directory in which a file named\n"
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"compile_commands.json exists (use -DCMAKE_EXPORT_COMPILE_COMMANDS=ON\n"
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"CMake option to get this output). When no build path is specified,\n"
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"clang-check will attempt to locate it automatically using all parent\n"
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"paths of the first input file.\n"
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"\n"
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"<source0> ... specify the paths of source files. These paths are looked\n"
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"up in the compile command database. If the path of a file is absolute,\n"
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"it needs to point into CMake's source tree. If the path is relative,\n"
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"the current working directory needs to be in the CMake source tree and\n"
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"the file must be in a subdirectory of the current working directory.\n"
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"\"./\" prefixes in the relative files will be automatically removed,\n"
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"but the rest of a relative path must be a suffix of a path in the\n"
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"compile command database.\n"
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"\n"
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"For example, to use clang-check on all files in a subtree of the source\n"
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"tree, use:\n"
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"\n"
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" find path/in/subtree -name '*.cpp'|xargs clang-check\n"
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"\n"
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"or using a specific build path:\n"
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"\n"
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" find path/in/subtree -name '*.cpp'|xargs clang-check -p build/path\n"
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"\n"
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"Note, that path/in/subtree and current directory should follow the\n"
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"rules described above.\n"
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"\n"
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);
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int main(int argc, const char **argv) {
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llvm::OwningPtr<CompilationDatabase> Compilations(
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FixedCompilationDatabase::loadFromCommandLine(argc, argv));
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cl::ParseCommandLineOptions(argc, argv);
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if (!Compilations) {
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std::string ErrorMessage;
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if (!BuildPath.empty()) {
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Compilations.reset(
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CompilationDatabase::autoDetectFromDirectory(BuildPath, ErrorMessage));
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} else {
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Compilations.reset(CompilationDatabase::autoDetectFromSource(
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SourcePaths[0], ErrorMessage));
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}
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if (!Compilations)
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llvm::report_fatal_error(ErrorMessage);
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}
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ClangTool Tool(*Compilations, SourcePaths);
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return Tool.run(newFrontendActionFactory<clang::SyntaxOnlyAction>());
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}
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