[llvm-dev] Debugging clang with debugger breakpoints ?

Joan Lluch via llvm-dev llvm-dev at lists.llvm.org
Mon Nov 4 12:29:44 PST 2019

Hi David,

Thank you for your help. Please, can you elaborate on this?. The command line that I get with -### starts with this:

clang version 9.0.1 (https://github.com/llvm/llvm-project.git 6e38ee067b8fa08792f551fb565bbb8ada4864b1)
Target: msp430
Thread model: posix
InstalledDir: /Users/joan/LLVM-9/llvm-project/build/Debug/bin
 "/Users/joan/LLVM-9/llvm-project/build/Debug/bin/clang" "-cc1" "-triple" "msp430" "-emit-llvm" "-disable-free" "-main-file-name" "main.c" "-mrelocation-model" "static" "-mthread-model" "posix" "-fmath-errno" "-masm-verbose" "-mconstructor-aliases" "-nostdsysteminc" "-dwarf-column-info" "-debugger-tuning=gdb" "-target-linker-version" "305" "-momit-leaf-frame-pointer" "-coverage-notes-file" "/Users/joan/Documents-Local/Relay/RelayNou/main.gcno" "-resource-dir" "/Users/joan/LLVM-9/llvm-project/build/Debug/lib/clang/9.0.1" "-internal-isystem" "/Users/joan/LLVM-9/llvm-project/build/Debug/bin/../msp430/include" "-Oz" "-fdebug-compilation-dir" "/Users/joan/Documents-Local/Relay/RelayNou" "-ferror-limit" "19" "-fmessage-length" "224" "-fobjc-runtime=gcc" "-fdiagnostics-show-option" "-fcolor-diagnostics" "-vectorize-slp" "-faddrsig" "-o" "main.ll" "-x" "c" "main.c"

So what should I set on the debugger?



> On 4 Nov 2019, at 21:03, David Blaikie <dblaikie at gmail.com> wrote:
> Run clang with -### to get the underlying command line (the one that has the first argument "-cc1") and then run that command under the debugger instead.
> On Mon, Nov 4, 2019 at 12:02 PM Joan Lluch via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> Hi All,
> I want to understand some parts of ‘clang' by setting debug breakpoints. 
> I have successfully done so with “llc” but I found that debugger breakpoints do not work for ‘clang’
> The apparent cause is that the clang code is run as a child process which is created in the ‘Execute' function of ‘Program.inc'. The debugger stops fine at breakpoints set on the main thread, but breakpoints do not work for any code that is executed as the child process. I am compiling with Xcode in case this makes a difference.
> Thanks in advance for any help.
> John
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