Re: clang_parseTransitionUnit2 gives error

Sven Brauch <mail-ITmcY+a7/[email protected]> Sun, 17 Apr 2022 11:59:49 +0200
Newsgroups	gmane.comp.kde.devel.kdevelop
Message-ID	<[email protected]>
Hi,

sorry, I don't see anything going wrong here -- I anticipated maybe it 
would load 2 different versions of libclang but that doesn't seem to be 
the case :(

Greetings!


On 4/17/22 09:34, Enes Albay wrote:
> 
> 
> 
> Sorry for the late reply. I tried LIBGL_ALWAYS_INDIRECT=1 ./helloworld 
> from stackoverflow.
> 
> 
> I attached LD_DEBUG=libs output with Qt and without Qt to this email.
> 
> 
> 
> 
> 
> On Fri, Apr 15, 2022 at 2:02 AM Sven Brauch <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>     Hi,
> 
>     which solution did you try? The actual answer (not the comments) sounds
>     plausible, we have heard of similar issues before, but that might
>     not be
>     easy to do on your system.
> 
>     Maybe you can get further info with LD_DEBUG=libs set and checking if
>     indeed two different versions of libclang are loaded along the road?
> 
>     Greetings,
>     Sven
> 
> 
>     On 4/14/22 23:26, Enes Albay wrote:
>      >
>      > I guess I found the reason for the error. Clang works if I
>     comment out
>      > the line "QApplication app(argc, argv);" Otherwise It gives error
>     like this:
>      >
>      > $ ./helloworld
>      > 4
>      > Unable to parse translation unit. Quitting.
>      >
>      > As far as I understand this bug is related to this one
>      >
>     https://stackoverflow.com/questions/17953156/cannot-use-libclang-with-qt
>     <https://stackoverflow.com/questions/17953156/cannot-use-libclang-with-qt>
> 
>      >
>     <https://stackoverflow.com/questions/17953156/cannot-use-libclang-with-qt
>     <https://stackoverflow.com/questions/17953156/cannot-use-libclang-with-qt>>
>      >
>      > But the solution suggested in stackoverflow does not work for me.
>     Do you
>      > have any idea ?
>      >
>      > /******************MAIN **************************/
>      > #include <QApplication>
>      > #include "clang-c/Index.h"
>      >
>      > #include <iostream>
>      > using namespace std;
>      >
>      > int main (int argc, char *argv[])
>      > {
>      >      QApplication app(argc, argv);
>      >     CXIndex index = clang_createIndex(0, 0);
>      >    CXTranslationUnit unit = nullptr;
>      >
>      >    CXErrorCode code = clang_parseTranslationUnit2(
>      >      index,
>      >     
>     "/media/enes/MyFiles/programming/cpp/cmakeExamples/ex1/main.cpp",
>      > nullptr, 0,
>      >      nullptr, 0,
>      >      CXTranslationUnit_None, &unit);
>      >
>      >    cerr << code << endl;
>      >    if (code != CXError_Success) {
>      >      cerr << "Unable to parse translation unit. Quitting." << endl;
>      >      exit(-1);
>      >    }
>      >
>      >    return 0;
>      > }
>      >
>      >
>      > # CMakeLists.txt
>      >
>      > cmake_minimum_required(VERSION 3.0)
>      >
>      > project (helloworld)
>      >
>      > set(LLVM_ROOT /usr/lib/llvm-13)
>      > set(QT_MIN_VERSION "5.15.2")
>      >
>      > # Find Qt modules
>      > find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
>      >      Core    # QCommandLineParser, QStringLiteral
>      >      Widgets # QApplication
>      > )
>      >
>      > find_program(LLVM_CONFIG_EXECUTABLE NAMES llvm-config HINTS
>      > ${LLVM_ROOT}/bin DOC "llvm-config executable" NO_DEFAULT_PATH)
>      > message(${LLVM_CONFIG_EXECUTABLE})
>      > set(Clang_DIR /usr/lib/llvm-13/cmake)
>      >
>      > # Find CMake file for Clang
>      > find_package(Clang REQUIRED)
>      >
>      > execute_process(
>      >          COMMAND ${LLVM_CONFIG_EXECUTABLE} --includedir
>      >          OUTPUT_VARIABLE LLVM_INCLUDE_DIRS
>      >          OUTPUT_STRIP_TRAILING_WHITESPACE
>      >          )
>      >
>      > message(${LLVM_INCLUDE_DIRS})
>      >
>      > execute_process(
>      >          COMMAND ${LLVM_CONFIG_EXECUTABLE} --libdir
>      >          OUTPUT_VARIABLE LLVM_LIBRARY_DIRS
>      >          OUTPUT_STRIP_TRAILING_WHITESPACE
>      >          )
>      >
>      > include_directories(${LLVM_INCLUDE_DIRS})
>      >
>      > set(helloworld_SRCS main.cpp)
>      > add_executable(helloworld ${helloworld_SRCS})
>      > target_link_libraries(helloworld
>      >      Qt5::Widgets
>      >      /usr/lib/llvm-13/lib/libclang.so
>      >      /usr/lib/llvm-13/lib/libclang-cpp.so.13
>      > )
>      > ~
>      >
>      >
>      >
>      > On Tue, Apr 12, 2022 at 6:37 PM Milian Wolff <[email protected]
>     <mailto:[email protected]>
>      > <mailto:[email protected] <mailto:[email protected]>>> wrote:
>      >
>      >     On Tuesday, April 12, 2022 5:33:38 PM CEST Enes Albay wrote:
>      >      > I found something. After removing clang and llvm from my
>     system I
>      >     get the
>      >      > following error which is the same as before removing clang.
>      >      >
>      >      > I think the actual problem is clang_parseTranslationUnit2
>     can not
>      >     call
>      >      > clang even before removing clang
>      >      >
>      >      > Is there a way to verify such a situation?
>      >
>      >     We use libclang directly, not clang. Try to ldd on the
>      >     kdevclangsupport or use
>      >     gdb and `info shared` to see where it loads that from. You didn't
>      >     remove all
>      >     of that yet apparently.
>      >
>      >     --
>      >     Milian Wolff
>      > http://milianw.de <http://milianw.de> <http://milianw.de
>     <http://milianw.de>>
>      >
>      >
>      >
>      >
>      > --
>      > Enes Albay
> 
> 
> 
> -- 
> Enes Albay
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