Firstly, here are the characters in our story: * lldb
$ lldb --version lldb version 5.0.1 * clang $ p=/path/to/clang $ file -L "$p" /path/to/clang: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, BuildID[sha1]=3a2da750e90367b294e4219896738fa9b0a285ad, with debug_info, not stripped $ "$p" --version clang version 7.0.0 (trunk 324807) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /path/to Launch "lldb" with the above "clang": $ lldb "$p" (lldb) target create "/path/to/clang" Current executable set to '/path/to/clang' (x86_64). (lldb) Set a breakpoint: (lldb) breakpoint set --name clang::driver::Compilation::ExecuteCommand Breakpoint 1: where = clang`clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const + 50 at Compilation.cpp:142, address = 0x00000000034a9a9c Launch the executable: (lldb) process launch -- /dev/null Process 18950 launched: '/path/to/clang' (x86_64) Process 18950 stopped * thread #1, name = 'clang', stop reason = breakpoint 1.1 frame #0: 0x00005555589fda9c clang`clang::driver::Compilation::ExecuteCommand(this=0x000055555fdd5ec0, C=0x000055555fdae930, FailingCommand=0x00007fffffffcd38) const at Compilation.cpp:142 139 140 int Compilation::ExecuteCommand(const Command &C, 141 const Command *&FailingCommand) const { -> 142 if ((getDriver().CCPrintOptions || 143 getArgs().hasArg(options::OPT_v)) && !getDriver().CCGenDiagnostics) { 144 raw_ostream *OS = &llvm::errs(); 145 Now, try to print an expression, even a simple constant expression: (lldb) print 0 error: expected unqualified-id Note that the initial attempt to run the command "print 0" causes an enormous amount of computing to occur before the error is produced; subsequent attempts to issue the command produce the error message much more quickly. Sincerely, Michael Witten _______________________________________________ lldb-dev mailing list lldb-dev@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev