--- This post is easier to read with BBEdit and C++ colouring.--- We get strange problems with breakpoints appearing after migration (MacBook x86_64 Sequoia to Mac M3 arm64 Sequoia). Context We have kept our app on the MacBook and experimented no problems. We use clang++ and lldb. Xcode is installed but we use only CommandLineTools (no XCode project) -- and git on our lab forge. After using the Apple migration tool, we got many problems in compiling and link-edit, in particular for dylibs. We uninstalled all these tools and reinstalled them, using Homebrew for llvm and lld, and from AppleStore for Xcode. We also added to our CPPFLAGS -arch arm64 -w -g -O0. We use 'make' recursively (in principle, 0 or 1 Makefile per folder. Problems Our app crashes unexpectedly: without lldb: ...Serveur: serveur.out ... stop reason = EXC_BREAKPOINT (code=1, subcode=0x1000c662c) at descripteursDeNoeuds.cpp:947:15 with lldb: ...Serveur: lldb serveur.out -arch aarch64 (lldb) process launch ... Process 2081 stopped thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1000c6388) frame #0: 0x00000001000c6388 serveur.out`creerDescrDLING(m=1, bImpr=false) at descripteursDeNoeuds.cpp:947:15 We can set breakpoints, but the location is OK relative to some files, and "pending" for the file where the crash seems to occur. ...Serveur: lldb serveur.out -arch aarch64 (lldb) target create --arch=aarch64 "serveur.out" Current executable set to '/Users/boitet/ariane-y/Ariane-Y_prog_2013/Moniteurs/Moniteur-AY/Serveur/serveur.out' (arm64). (lldb) br set -f initDling.cpp -l 150 Breakpoint 1: where = serveur.out`initDling(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator>) + 1336 at initDling.cpp:150:30, address = 0x00000001000e0ebc (lldb) br set -f descripteurDeNoeuds.cpp -l 886 Breakpoint 2: no locations (pending). WARNING: Unable to resolve breakpoint to any actual locations. (lldb) br set -f descripteurDeNoeuds.cpp -l 947 Breakpoint 3: no locations (pending). WARNING: Unable to resolve breakpoint to any actual locations. (lldb) br set -f initDling.cpp -l 153 Breakpoint 4: where = serveur.out`initDling(std::__1::basic_string<char, std::__1::char_traits, std::__1::allocator>) + 1364 at initDling.cpp:153:23, address = 0x00000001000e0ed8 (lldb) br set -f descripteurDeNoeuds.cpp -l 912 Breakpoint 5: no locations (pending). WARNING: Unable to resolve breakpoint to any actual locations. (lldb) br set -f descripteurDeNoeuds.cpp -l 3344 Breakpoint 6: no locations (pending). WARNING: Unable to resolve breakpoint to any actual locations. ==> We can set breakpoints in the caller (initDling) but not in descripteurDeNoeuds.cpp. ==> Here, we set 2 "normal" breakpoints at lines 150 and 153 of initDling.cpp, and they work well: normal stop, step-over ==> descripteurDeNoeuds.cpp contains 1 master procedure (creerDescrDepuisNoeud) that calls more specific procedures (like creerDescrDLING) ==> continuation (lldb) process launch Process 2081 launched: '/Users/boitet/ariane-y/Ariane-Y_prog_2013/Moniteurs/Moniteur-AY/Serveur/serveur.out' (arm64) "==============> main (du serveur) ... $$$ 4: initDling: créer les descripteurs de nœud des nœuds de cet arbre $$$ 5: initDling : --> creerDescrDepuisNoeud(j=1, 0x14a068000), i = 1, gauche(j) = 2, droit(j) = 1, benj(j) = 1 Process 2081 stopped thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1 frame #0: 0x00000001000e0ebc serveur.out`initDling(nomFich="../../../INCL/fichInitDling.arbDS") at initDling.cpp:150:30 147 /*** <-TRACE / } 148 149 /**************************************/ -> 150 rc = creerDescrDepuisNoeud(j, paxml); 151 /**************************************/ 152 153 / ->TRACE ***/ if (tr>1) { (lldb) th step-over ============================================================================ $$$ 4: creerDescrDepuisNoeud (mPar = 1, pAxmlPar = 0x14a068000) $$$ 5: creerDescrDepuisNoeud -- boucle : nomBalise = DLING, strTempo = ANNOTATIONS, trouve = 0, k = 482 $$$ 5: creerDescrDepuisNoeud -- boucle : nomBalise = DLING, strTempo = Corpus, trouve = 0, k = 483 ... ==> strange EXC_BREAKPOINT ... indNOEUD : 1 adrDESCR : 105553137336320 "==> arrêt forcé, descripteurDeNoeuds.cpp -l 966: on attend 1 seconde "==> et on exécute 'n = n / 0;' avec n = 20... mais on a ENSUITE : "==> stop reason = EXC_BREAKPOINT (code=1, subcode=0x1000c662c) at descripteursDeNoeuds.cpp:947:15 ==> The instruction 'n = n / 0;' mentioned in the message is NOT executed as it was commented out (line 964). ==> There is no division by 0 in this code. ==> the last 3 lines of the trace are produced by cout instructions, at lines 962--965 ==> system-originated EXC_BREAKPOINT, at a wrong line (947) in any case! Process 2081 stopped thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1000c6388) frame #0: 0x00000001000c6388 serveur.out`creerDescrDLING(m=1, bImpr=false) at descripteursDeNoeuds.cpp:947:15 944 if (pAxml->lAttr.benj(i)) fini = true; else i = pAxml->lAttr.droit(i); 945 } // while (!fini) 946 // Imprimer le descripteur si le 2° paramètre (booléen) est vrai -> 947 if (bImpr || bDescr) // breakpoint set -f descripteurDeNoeuds.cpp -l 947 ne va pas 948 { cout<<"--------------------------------------------------------"<<endl; 949 cout<<"--- DescrDLING("<<m<<"), "<<"pDescr="<<pDescr<<" ---"<<endl; 950 cout<<"codeBalAY : "<codeBalAY<<endl; (lldb) ==> but we are at line 966, not 947 ==> And at line 967, there is nothing special: if (bImpr || bDescr) // breakpoint set -f descripteurDeNoeuds.cpp -l 947 ne va pas { cout<<"--------------------------------------------------------"<<endl; cout<<"--- DescrDLING("<<m<<"), "<<"pDescr="<<pDescr<<" ---"<<endl; ==> continuation, interruption and backtrace (lldb) p (bImpr || bDescr) (bool) true (lldb) p bImpr (bool) false (lldb) p bDescr (bool) true (lldb) (bool) true (lldb) bt thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1000c6388) frame #0: 0x00000001000c6388 serveur.out`creerDescrDLING(m=1, bImpr=false) at descripteursDeNoeuds.cpp:947:15 frame #1: 0x00000001000dd710 serveur.out`creerDescrDepuisNoeud(mPar=1, pAxmlPar=0x000000014a068000) at descripteursDeNoeuds.cpp:3406:41 ... ==> ==> After that, we are blocked, no step or continue instruction works. Then we quit. We could not find this exact subcode (0x1000c6388) on the Web. We found a post mentioning a similar problem, with another subcode (0x100308448). https://stackoverflow.com/questions/45413088/error-exc-breakpoint-code-1-subcode-0x100308448 But the author worked under Xcode, and we don't.