[lldb-dev] Unable to build LLDB 4.0 on Debian Linux

[Pavel Labath via lldb-dev]

What's the cmake command you are using?

It sounds like you somehow ended up enabling -Werror, which is
confusing the backtrace-detection code (and probably most of the other
cmake compile checks).

One of the workarounds would be to disable -Werror.

pl

On 28 April 2017 at 22:36, Andy Gibbs via lldb-dev
<lldb-dev at lists.llvm.org> wrote:
> Hi,
>
>
> I am having a problem building the 4.0 release branch of LLDB on Debian
> Stretch.  Cmake returns the following fault:
>
>
>   -- LLDB version: 4.0.0
>   -- Found LibXml2: /usr/lib/x86_64-linux-gnu/libxml2.so (found version
> "2.9.4")
>   -- Performing Test HAVE_PROCESS_VM_READV
>   -- Performing Test HAVE_PROCESS_VM_READV - Success
>   -- Found Curses: /usr/lib/x86_64-linux-gnu/libcurses.so
>   -- Looking for __GLIBCXX__
>   -- Looking for __GLIBCXX__ - found
>   -- Performing Test LLDB_USING_LIBSTDCXX_4_9
>   -- Performing Test LLDB_USING_LIBSTDCXX_4_9 - Success
>   -- Looking for backtrace
>   -- Looking for backtrace - not found
>   -- Could NOT find Backtrace (missing:  Backtrace_LIBRARY)
>   -- Found Doxygen: /usr/bin/doxygen (found version "1.8.13")
>   -- Found SWIG: /usr/bin/swig3.0 (found version "3.0.10")
>   -- Performing Test CXX_SUPPORTS_NO_MACRO_REDEFINED
>   -- Performing Test CXX_SUPPORTS_NO_MACRO_REDEFINED - Success
>   -- Symbols (liblldb): exporting all symbols from the lldb namespace
>   CMake Error: The following variables are used in this project, but they
> are set to NOTFOUND.
>   Please set them or make sure they are set and tested correctly in the
> CMake files:
>   Backtrace_LIBRARY (ADVANCED)
>       linked by target "liblldb" in directory
> clang-4.0/tools/lldb/source/API
>       linked by target "LLDBBreakpointTests" in directory
> clang-4.0/tools/lldb/unittests/Breakpoint
>       linked by target "LLDBCoreTests" in directory
> clang-4.0/tools/lldb/unittests/Core
>       linked by target "EditlineTests" in directory
> clang-4.0/tools/lldb/unittests/Editline
>       linked by target "ExpressionTests" in directory
> clang-4.0/tools/lldb/unittests/Expression
>       linked by target "HostTests" in directory
> clang-4.0/tools/lldb/unittests/Host
>       linked by target "InterpreterTests" in directory
> clang-4.0/tools/lldb/unittests/Interpreter
>       linked by target "LanguageCPlusPlusTests" in directory
> clang-4.0/tools/lldb/unittests/Language/CPlusPlus
>       linked by target "LLDBPlatformTests" in directory
> clang-4.0/tools/lldb/unittests/Platform
>       linked by target "ProcessGdbRemoteTests" in directory
> clang-4.0/tools/lldb/unittests/Process/gdb-remote
>       linked by target "LLDBMinidumpTests" in directory
> clang-4.0/tools/lldb/unittests/Process/minidump
>       linked by target "ScriptInterpreterPythonTests" in directory
> clang-4.0/tools/lldb/unittests/ScriptInterpreter/Python
>       linked by target "SymbolTests" in directory
> clang-4.0/tools/lldb/unittests/Symbol
>       linked by target "SymbolFileDWARFTests" in directory
> clang-4.0/tools/lldb/unittests/SymbolFile/DWARF
>       linked by target "UnwindAssemblyx86Tests" in directory
> clang-4.0/tools/lldb/unittests/UnwindAssembly/x86
>       linked by target "UtilityTests" in directory
> clang-4.0/tools/lldb/unittests/Utility
>
>   -- Configuring incomplete, errors occurred!
>   See also "build-4.0/bootstrap/CMakeFiles/CMakeOutput.log".
>   See also "build-4.0/bootstrap/CMakeFiles/CMakeError.log".
>
>
>
> The output from CMakeError.log is:
>
>
>   Determining if the backtrace exist failed with the following output:
>   Change Dir: build-4.0/bootstrap/CMakeFiles/CMakeTmp
>
>   Run Build Command:"build-4.0/bin/ninja" "cmTC_1e735"
>   [1/2] Building C object CMakeFiles/cmTC_1e735.dir/CheckSymbolExists.c.o
>   FAILED: CMakeFiles/cmTC_1e735.dir/CheckSymbolExists.c.o
>   /usr/bin/cc    -fPIC -Wall -W -Wno-unused-parameter -Wwrite-strings
> -Wno-missing-field-initializers -pedantic -Wno-long-long -Wno-comment
> -Werror -Werror=date-time -ffunction-sections -fdata-sections -o
> CMakeFiles/cmTC_1e735.dir/CheckSymbolExists.c.o   -c
> build-4.0/bootstrap/CMakeFiles/CMakeTmp/CheckSymbolExists.c
>   build-4.0/bootstrap/CMakeFiles/CMakeTmp/CheckSymbolExists.c: In function
> ‘main’:
>   build-4.0/bootstrap/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8:11: error:
> ISO C forbids conversion of function pointer to object pointer type
> [-Werror=pedantic]
>      return ((int*)(&backtrace))[argc];
>              ^
>   cc1: all warnings being treated as errors
>   ninja: build stopped: subcommand failed.
>
>   File build-4.0/bootstrap/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
>   /* */
>   #include <execinfo.h>
>
>   int main(int argc, char** argv)
>   {
>     (void)argv;
>   #ifndef backtrace
>     return ((int*)(&backtrace))[argc];
>   #else
>     (void)argc;
>     return 0;
>   #endif
>   }
>
>
> It seems that the detection routine is invalid.  The gcc in use is 6.3.0.
> Anyone any idea how to fix / work around this problem?
>
>
> Many thanks,
>
>
> Andy
>
>
>
>
>
>
> _______________________________________________
> lldb-dev mailing list
> lldb-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>