clang::HeaderSearch搜索路径被忽略

clang::HeaderSearch search path ignored

本文关键字：搜索 HeaderSearch clang 路径      更新时间：2023-10-16

我试图让clang::CompilerInstance解析包含包含的源文件，但我不知道如何让它实际找到包含的头。下面是我的设置:

std::unique_ptr<clang::CompilerInstance> ci(new clang::CompilerInstance());
ci->createDiagnostics();
LLVMInitializeARMTarget();
LLVMInitializeARMTargetMC();
LLVMInitializeARMAsmPrinter();
LLVMInitializeARMAsmParser();

std::shared_ptr<clang::TargetOptions> options(new clang::TargetOptions);
options->Triple = "arm-v7m-unknown-none-eabi";
options->CPU = "cortex-m3";
clang::TargetInfo *targetInfo = clang::TargetInfo::CreateTargetInfo(ci->getDiagnostics(), options);
ci->setTarget(targetInfo);
ci->createFileManager();
ci->createSourceManager(ci->getFileManager());
NSURL *sysrootURL = [[[NSBundle mainBundle] resourceURL] URLByAppendingPathComponent:@"Compiler/basalt"];
NSURL *includeURL = [sysrootURL URLByAppendingPathComponent:@"include"];
ci->createPreprocessor(clang::TranslationUnitKind::TU_Complete);
ci->getPreprocessorOpts().UsePredefines = false;

// Header searcher
llvm::IntrusiveRefCntPtr<clang::HeaderSearchOptions> hso(new clang::HeaderSearchOptions());
hso->UseBuiltinIncludes = false;
hso->UseStandardSystemIncludes = false;
hso->UseStandardCXXIncludes = false;
hso->Sysroot = [[includeURL path] UTF8String];
clang::HeaderSearch headerSearch(hso, ci->getSourceManager(), ci->getDiagnostics(), ci->getLangOpts(), targetInfo);
headerSearch.AddSearchPath(clang::DirectoryLookup(ci->getFileManager().getDirectory([[includeURL path] UTF8String]), clang::SrcMgr::C_System, false), true);
clang::InitializePreprocessor(ci->getPreprocessor(), ci->getPreprocessorOpts(), ci->getFrontendOpts());

// Main file
const clang::FileEntry *file = ci->getFileManager().getFile([[[_url URLByAppendingPathComponent:@"src/main.c"] path] UTF8String]);
ci->getSourceManager().setMainFileID(ci->getSourceManager().createFileID(file, clang::SourceLocation(), clang::SrcMgr::C_User));
ci->getPreprocessor().EnterMainSourceFile();
ci->getDiagnosticClient().BeginSourceFile(ci->getLangOpts(), &ci->getPreprocessor());
clang::Token tok;
do {
    ci->getPreprocessor().Lex(tok);
    if(ci->getDiagnostics().hasErrorOccurred())
        break;
    ci->getPreprocessor().DumpToken(tok);
    std::cerr << std::endl;
} while(tok.isNot(clang::tok::eof));
ci->getDiagnosticClient().EndSourceFile();

路径绝对是100%正确的，一遍又一遍地检查。这一切都可以工作，直到我扔给它的源代码包含类似#include <foobar.h>的东西，在这种情况下，它将失败的error 'foobar.h' file not found，即使foobar.h肯定在那里。我觉得我错过了一些很明显的东西。有什么正确的方向吗?

首先，放弃使用CompilerInstance-所有权语义是如此糟糕，它实际上是不可用的(除非他们在3.6与unique_ptr修复)。更简单的方法是自己制作组件。

其次，是的，你必须自己做。以下是我自己使用Clang的项目的逐字摘录:

clang::HeaderSearch hs(/*params*/);
// WHY AM I DOING THIS MYSELF CLANG
// CAN'T YOU READ YOUR OWN CONSTRUCTOR PARAMETERS AND OPTIONS STRUCTS?
std::vector<clang::DirectoryLookup> lookups;
for (auto entry : opts.HeaderSearchOptions->UserEntries) {
    auto lookup = clang::DirectoryLookup(FileManager.getDirectory(entry.Path), clang::SrcMgr::CharacteristicKind::C_System, false);
    if (!lookup.getDir())
        throw SpecificError<ClangCouldNotInterpretPath>(a, where, "Clang could not interpret path " + entry.Path);
    lookups.push_back(lookup);
}
hs.SetSearchPaths(lookups, 0, 0, true);
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