[MACTCL] MacOS Debugging setup

[Phillip B. <phi...@um...>]

Can anyone point me toward a guide to running lldb on a built Tcl
executable on MacOS 26 Arm64?  I found:

https://wiki.tcl-lang.org/page/Tcl+on+MacOS

on the wiki, but it seems more interested in wish than in Tcl, and also in
exercising the full MacOS App mechanism and running Wish.app.  There isn't
much there about running the debugger and even less about tclsh.  I have
successfully built tclsh, and can invoke it under lldb, set breakpoints,
run etc. but I seem unable to get a debug version of the file that I am
trying to look at (tclParse.c).  I can see source code around the call to
Tcl_Main, but not at lower levels of the stack.  When I stop, say in
Tcl_ParseVarName, I just see assembly code.

Can you describe how to build, invoke lldb, set a breakpoint at
Tcl_ParseVarName and then have the debugger show source code for
Tcl_ParseVarName?

Here is a detailed runthrough of what I last tried:

I used the make command:

$ CONFIGURE_ARGS="--enable-symbols" make -f GNUmakefile

 inside of the macosx directory, then ran lldb:

$ lldb ../../build/tcl/Development//usr/local/bin/Development/tclsh

I ran that tclsh in another shell window and I used the attach <pid>
command to attach to my running tclsh (I want to be able to type into Tcl
and debug from another window at the same time), though I get the same
result when I just use the run command from inside lldb.

Typed "b Tcl_ParseVarName" and successfully set the breakpoint.

Typed continue, but when it stops in Tcl_ParseVarName, I see only assembly
code, no source.  If I type list, I see source code, but it is only for the
call to Tcl_Main.  I can't go down the stack without diving into assembly
code.  I am thinking that I have only partial debug code for some reason,
but I don't know enough about how the MacOS build works to know what is
where and how it got there.  It seems that things are built a couple times
by default.

I am running on MacOS 26 - newly installed, and have never tried running a
debugger on MacOS before (my previous experience is all on Linux).  I am
also trying to build something close to the tip of Tcl 9.1 - i.e. the main
branch.  I am a complete newbie concerning things like codesigning etc.

Phil