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POlibtooling can't find stddef.h nor other headers
 

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  1. POlibtooling can't find stddef.h nor other headers
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    <p>I am writing a tool to parse C family source code projects basically following these two tutorials <a href="http://kevinaboos.blogspot.com/2013/07/clang-tutorial-part-ii-libtooling.html" rel="noreferrer">1</a> <a href="http://clang.llvm.org/docs/LibTooling.html" rel="noreferrer">2</a> on clang 3.4 (trunk 192426) on ubuntu 12.04.</p> <p>Based on <a href="http://clang.llvm.org/docs/LibTooling.html" rel="noreferrer">offical tutorial</a>, it says I could pass <code>compile_commands.json</code> by <code>-p</code>, however, if I only type <code>$ ./main -p [path of compile_commands.json]</code>, it will complain about missing positional arguments. It seems like I still need to pass all file names as arguments, which is not practical if the project is really huge. I prefer it could simply parse all files specified in <code>compile_commands.json</code> without asking but can't find out how to turn that on.</p> <p>Since I can't find a tutorial for <a href="http://clang.llvm.org/doxygen/classclang_1_1tooling_1_1CommonOptionsParser.html" rel="noreferrer">CommonOptionsParser</a> to do any customize thing, I use <a href="http://clang.llvm.org/doxygen/classclang_1_1tooling_1_1CompilationDatabase.html" rel="noreferrer">CompilationDatabase</a> class instead. There is a dummy visitor returning <code>true</code> for <code>VisitStmt</code>, <code>VisitDecl</code> and <code>VisitType</code> so I'll skip that. The <code>main</code> function is pretty simple:</p> <pre><code>int main(int argc, const char **argv) { string errorMsg = ""; CompilationDatabase *cd = CompilationDatabase::autoDetectFromDirectory (argv[1], errorMsg); ClangTool Tool(*cd, cd-&gt;getAllFiles()); int result = Tool.run(newFrontendActionFactory&lt;ExampleFrontendAction&gt;()); return result; } </code></pre> <p>I choose <a href="https://github.com/Itseez/opencv" rel="noreferrer"><code>opencv</code></a> to parse since using cmake gaurantee the correctness of <code>compile_commands.json</code>(right?). However, a lot of errors show up (attached in the end). LibTooling complain about it can't find <code>stdarg.h</code>, <code>stddef.h</code> nor <code>emmintrin.h</code>. It's a <a href="http://clang.llvm.org/docs/FAQ.html" rel="noreferrer">FAQ</a> for clang, but it says why that will happen, but didn't say how to solve that while using libtooling. Pass all arguments for <code>clang -###</code> for clang could solve that, but how to pass those arguments while using libtooling? </p> <pre><code># include &lt;stdarg.h&gt; ^ 1 error generated. Error while processing /home/jcwu/repos/opencv/3rdparty/openexr/IlmImf/ImfCompressionAttribute.cpp. In file included from /home/jcwu/repos/opencv/3rdparty/libjpeg/jmemansi.c:16: /home/jcwu/repos/opencv/3rdparty/libjpeg/jinclude.h:35:10: fatal error: 'stddef.h' file not found #include &lt;stddef.h&gt; ^ 1 error generated. Error while processing /home/jcwu/repos/opencv/3rdparty/libjpeg/jmemansi.c. error: no suitable precompiled header file found in directory '/home/jcwu/repos/opencv/modules/legacy/precomp.hpp.gch' 1 error generated. Error while processing /home/jcwu/repos/opencv/modules/legacy/src/hmmobs.cpp. In file included from /home/jcwu/repos/opencv/3rdparty/libwebp/enc/quant.c:17: In file included from /home/jcwu/repos/opencv/3rdparty/libwebp/enc/../dsp/../enc/vp8enci.h:17: /usr/include/string.h:34:10: fatal error: 'stddef.h' file not found #include &lt;stddef.h&gt; ^ 1 error generated. Error while processing /home/jcwu/repos/opencv/3rdparty/libwebp/enc/quant.c. In file included from /home/jcwu/repos/opencv/modules/imgproc/opencv_test_imgproc_pch_dephelp.cxx:1: In file included from /home/jcwu/repos/opencv/modules/imgproc/test/test_precomp.hpp:12: In file included from /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/iostream:40: In file included from /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/ostream:40: In file included from /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/ios:39: In file included from /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/iosfwd:42: In file included from /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/bits/postypes.h:42: In file included from /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/cwchar:46: /usr/include/wchar.h:40:11: fatal error: 'stdarg.h' file not found # include &lt;stdarg.h&gt; </code></pre> <p>==== Update ==== </p> <p>Read CommonOptionsParser.cpp source code. It uses FixedCompilationDatabase to guess CompilationDatabase by arguments after --, then pass arguments before -- for custom (only -p in CommonOptionParser) options. In my case compile_commands.json is required, so I could skip using CommonOptionsParser. </p> <p>Therefore my problem reduce to how to pass those options from "clang -###" to LibTooling when I have a compile_commands.json? Should I invoke shell command for every file I want to parse?</p> <p>==== Update ====</p> <p>I think modify compile_commands.json might be easier. I'm not sure why the compile_commands.json generated by CMake won't include my system header files folder correctly, since the Makefile generate by that CMakeList.txt could compile correctly, how come the compile_commands.json miss a lot of things. </p>
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