I build guile and a few other things (including libgc, libffi, libintl, libunistring, libgmp, and libltdl) locally using a reproducible script. I've been using it on linux and mac since the days of ubuntu 12.04 and osx 10.8, and have kept it updated to work up through ubuntu 18.04 and os 10.15 beta (as of 3 months ago).
Today I tried running it on final mac os 10.15 and more up to date xcode 11. It explodes repeatably while building guile; the log shows 4880 Segmentation fault: 11 | GUILE_AUTO_COMPILE=0 ../meta/build-env guild snarf-check-and-output-texi > guile-procedures.texi make[3]: *** [guile-procedures.texi] Error 1 make[2]: *** [all] Error 2 make[1]: *** [all-recursive] Error 1 make: *** [all] Error 2 This is with either guile-2.2.3 or 2.2.6. ~/Library/Logs/DiagnosticReports/guile_2019-10-19-154334_rbb-osx1015-2.crash shows a backtrace: Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 libguile-2.2.1.dylib 0x0000000101e23e14 scm_i_symbol_chars + 4 (strings.c:818) 1 libguile-2.2.1.dylib 0x0000000101e2a1da scm_i_struct_inherit_vtable_magic + 42 (struct.c:204) 2 libguile-2.2.1.dylib 0x0000000101e2a7f9 scm_c_make_structv + 329 (struct.c:507) 3 libguile-2.2.1.dylib 0x0000000101e2ab7c scm_c_make_struct + 236 4 libguile-2.2.1.dylib 0x0000000101e2bc9b scm_init_struct + 219 (struct.c:1088) 5 libguile-2.2.1.dylib 0x0000000101dc3a71 scm_i_init_guile + 129 (init.c:413) 6 libguile-2.2.1.dylib 0x0000000101e2cf08 scm_i_init_thread_for_guile + 120 (threads.c:590) 7 libguile-2.2.1.dylib 0x0000000101e2f1b9 with_guile + 25 (threads.c:654) 8 libgc.1.dylib 0x0000000101f441bb GC_call_with_stack_base + 27 9 libguile-2.2.1.dylib 0x0000000101e2cf6b scm_with_guile + 43 (threads.c:710) 10 libguile-2.2.1.dylib 0x0000000101dc3995 scm_boot_guile + 69 (init.c:329) 11 guile 0x0000000101d88e9f main + 191 (guile.c:102) 12 libdyld.dylib 0x00007fff64dd6405 start + 1 ... 812 const char * 813 scm_i_symbol_chars (SCM sym) 814 { 815 SCM buf; 816 817 buf = SYMBOL_STRINGBUF (sym); 818 if (!STRINGBUF_WIDE (buf)) 819 return (const char *) STRINGBUF_CHARS (buf); I tried to get the OS to generate a full core dump, but apple's instructions to make sure /cores is writable fail on os 10.15. Maybe if I turn off SIP, but I can't do that until Monday. I can reproduce the problem by running just GUILE_AUTO_COMPILE=0 meta/build-env guild in the top level of the source tree, but I haven't figured out how to reproduce it in lldb yet. I tried unwinding all the wrappers, e.g. tail +5 meta/guild > guild.txt # do what meta-env would do: export GUILE=/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/libguile/guile export GUILE_LOAD_COMPILED_PATH=/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/module:/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/bootstrap:/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/prebuilt/64-bit-little-endian:/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/guile-readline export GUILE_LOAD_PATH=/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/module:/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/guile-readline export GUILE_SYSTEM_COMPILED_PATH= export GUILE_SYSTEM_EXTENSIONS_PATH= export GUILE_SYSTEM_PATH= export LTDL_LIBRARY_PATH=/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/libguile:/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/guile-readline export PATH=/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/meta:/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/libguile:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/Apple/usr/bin:/Library/Apple/bin:/opt/X11/bin:/Users/buildbot/Library/Python/3.7/bin export PKG_CONFIG_PATH=/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/meta export XDG_CACHE_HOME=/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/cache export GUILE_AUTO_COMPILE=0 $GUILE -e '(@@ (guild) main)' guild.txt That still crashes, and so does replacing the last line with /Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/libguile/.libs/guile -e '(@@ (guild) main)' guild.txt but alas replacing the last line with lldb /Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.6/libguile/.libs/guile -- -e '(@@ (guild) main)' guild.txt and running it just exits with status -1.