Basically, I checked out core-8-branch (commit
from the core repository earlier today, and tried a default build on my laptop running MacOS 10.12.6 (Sierra).
Tcl 8.7 checks out, but the bundled sqlite3.9.2 and tdbcsqlite3-1.0.3 packages segfaults.

It apparently was the same in the 8.6.6 release, because the whole thing started out with me observing
that the tdbcsqlite3 package from there would segfault whenever one tries to create a database
connection. (I'm surprised for in a year and a half I never used it before, but apparently I did all my
tdbcsqlite3 on the other computer.) From the look of the crash reports I got there, it looked like tclsqlite3
was in the process of resolving the file name when it jumped to 0x00000000:

Process:               Wish [6682]
Path:
Identifier:            com.tcltk.wish
Version:               8.6.6 (8.6.6)
Code Type:             X86-64 (Native)
Parent Process:        ??? [6680]
Responsible:           Wish [6682]
User ID:               12246

Date/Time:             2018-08-14 22:52:24.456 +0200
OS Version:            Mac OS X 10.12.6 (16G1510)
Report Version:        12
Anonymous UUID:        74D7A69C-9331-1B12-BE01-FA749CE25455

Sleep/Wake UUID:       5FEAA729-E019-402A-B4DD-EA707918EB78

Time Awake Since Boot: 36000 seconds
Time Since Wake:       16000 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [0]

VM Regions Near 0:
-->
    __TEXT                 00000001072a2000-00000001072a6000 [   16K] r-x/rwx SM=COW

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   ???                           	000000000000000000 0 + 0
1   Tcl                           	0x000000010dc497bd 0x10dbb4000 + 612285
2   Tcl                           	0x000000010dc4972b 0x10dbb4000 + 612139
3   Tcl                           	0x000000010dc489c8 Tcl_GetThreadData + 21
4   Tcl                           	0x000000010dc38790 0x10dbb4000 + 542608
5   Tcl                           	0x000000010dc38515 Tcl_FSGetTranslatedPath + 22
6   Tcl                           	0x000000010dc0ce75 Tcl_TranslateFileName + 48
7   libtclsqlite3.dylib           	0x000000010da47908 DbMain + 802
8   Tcl                           	0x00000001073fac13 0x1073e4000 + 93203
9   Tcl                           	0x00000001073f79cd TclNRRunCallbacks + 80
10  Tcl                           	0x00000001073f8c31 0x1073e4000 + 85041
11  Tcl                           	0x00000001073f84df Tcl_EvalEx + 26
12  Tk                            	0x000000010736dcb5 0x1072ad000 + 789685
13  com.apple.Foundation          	0x00007fffa3910afd -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 290
14  com.apple.Foundation          	0x00007fffa3910977 _NSAppleEventManagerGenericHandler + 102
15  com.apple.AE                  	0x00007fffa2d14f26 aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 544
16  com.apple.AE                  	0x00007fffa2d14c9d dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 39
17  com.apple.AE                  	0x00007fffa2d14ba9 aeProcessAppleEvent + 312
18  com.apple.HIToolbox           	0x00007fffa143fddf AEProcessAppleEvent + 55
19  com.apple.AppKit              	0x00007fff9f9c5d1d _DPSNextEvent + 1833
20  com.apple.AppKit              	0x00007fffa01417ee -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 2796
21  Tk                            	0x0000000107375aa6 0x1072ad000 + 821926
22  Tk                            	0x0000000107375e4e 0x1072ad000 + 822862
23  Tcl                           	0x00000001074a72ce Tcl_DoOneEvent + 317
24  Tk                            	0x00000001072c3c8a Tk_MainLoop + 33
25  Tk                            	0x00000001072d0ec1 Tk_MainEx + 1556
26  Wish                          	0x00000001072a544d 0x1072a2000 + 13389
27  libdyld.dylib                 	0x00007fffb7660235 start + 1

Thread 1:
0   libsystem_kernel.dylib        	0x00007fffb778eeb6 __select + 10
1   Tcl                           	0x00000001074f162e 0x1073e4000 + 1103406
2   libsystem_pthread.dylib       	0x00007fffb787993b _pthread_body + 180
3   libsystem_pthread.dylib       	0x00007fffb7879887 _pthread_start + 286
4   libsystem_pthread.dylib       	0x00007fffb787908d thread_start + 13

Thread 2:: com.apple.NSEventThread
0   libsystem_kernel.dylib        	0x00007fffb778734a mach_msg_trap + 10
1   libsystem_kernel.dylib        	0x00007fffb7786797 mach_msg + 55
2   com.apple.CoreFoundation      	0x00007fffa1ecf434 __CFRunLoopServiceMachPort + 212
3   com.apple.CoreFoundation      	0x00007fffa1ece8c1 __CFRunLoopRun + 1361
4   com.apple.CoreFoundation      	0x00007fffa1ece114 CFRunLoopRunSpecific + 420
5   com.apple.AppKit              	0x00007fff9fb12f02 _NSEventThread + 205
6   libsystem_pthread.dylib       	0x00007fffb787993b _pthread_body + 180
7   libsystem_pthread.dylib       	0x00007fffb7879887 _pthread_start + 286
8   libsystem_pthread.dylib       	0x00007fffb787908d thread_start + 13

Thread 3:
0   libsystem_kernel.dylib        	0x00007fffb778f44e __workq_kernreturn + 10
1   libsystem_pthread.dylib       	0x00007fffb787948e _pthread_wqthread + 1023
2   libsystem_pthread.dylib       	0x00007fffb787907d start_wqthread + 13

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000000  rcx: 0x0000000000000000  rdx: 0x0000000000000000
  rdi: 0x000000010dc8b370  rsi: 0x00007fffc05773c0  rbp: 0x00007fff5895bfc0  rsp: 0x00007fff5895bf88
   r8: 0x00007fce361c53a8   r9: 0x0000000000077ef0  r10: 0x00007fce361c53b0  r11: 0xffffffff00000000
  r12: 0x000000010dc8b520  r13: 0x000000010dc8b528  r14: 0x00007fffc05773c0  r15: 0x0000000000000028
  rip: 0x0000000000000000  rfl: 0x0000000000010246  cr2: 0x0000000000000000

Logical CPU:     0
Error Code:      0x00000014
Trap Number:     14


Binary Images:
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       0x1072ad000 -        0x1073a4fff +Tk (8.6.6 - 8.6.6) <77D1EC1F-E5C5-3255-8552-33F25076E877>
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       0x10c922000 -        0x10cac8fff  GLEngine (14.0.16) <E8C60E20-6414-32B2-8964-41882943D9C1>
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       0x10d490000 -        0x10d491fff +libtdbc1.0.4.dylib (0) <C7BAB228-19F6-3B2C-A69F-51BBAB37B70C>
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       0x10da46000 -        0x10da4cffb  libtclsqlite3.dylib (254.8) <87424AA7-1FF1-3661-A619-0ADC135221CA>
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       0x10dca1000 -        0x10dce3fff +libtifftcl3.9.7.dylib (0) <D439EEA8-2CF1-3610-A22F-A41C2774FA34>
       0x10ff52000 -        0x10ff8fdc7  dyld (433.5) <322C06B7-8878-311D-888C-C8FD2CA96FF3>
    0x7fff9caf6000 -     0x7fff9ce3bff7  com.apple.RawCamera.bundle (7.04 - 914) <86A67D11-9791-3CE6-9FF5-3387C0AB925B>
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    0x7fffb772b000 -     0x7fffb7743fff  libsystem_coretls.dylib (121.50.4) <EC6FCF07-DCFB-3A03-9CC9-6DD3709974C6>
    0x7fffb7744000 -     0x7fffb774afff  libsystem_dnssd.dylib (765.50.10) <0999444C-8148-3557-AC22-F5659D15FA62>
    0x7fffb774b000 -     0x7fffb7774ff7  libsystem_info.dylib (503.50.4) <611DB84C-BF70-3F92-8702-B9F28A900920>
    0x7fffb7775000 -     0x7fffb7797ff7  libsystem_kernel.dylib (3789.73.14) <BD75234C-529F-352C-A941-00C45D1DB1A3>
    0x7fffb7798000 -     0x7fffb77dffe7  libsystem_m.dylib (3121.6) <86D499B5-BBDC-3D3B-8A4E-97AE8E6672A4>
    0x7fffb77e0000 -     0x7fffb77feff7  libsystem_malloc.dylib (116.50.8) <A3D15F17-99A6-3367-8C7E-4280E8619C95>
    0x7fffb77ff000 -     0x7fffb7858ffb  libsystem_network.dylib (856.60.1) <369D0221-56CA-3C3E-9EDE-94B41CAE77B7>
    0x7fffb7859000 -     0x7fffb7862ff3  libsystem_networkextension.dylib (563.60.2) <B021F2B3-8A75-3633-ABB0-FC012B8E9B0C>
    0x7fffb7863000 -     0x7fffb786cff3  libsystem_notify.dylib (165.20.1) <B8160190-A069-3B3A-BDF6-2AA408221FAE>
    0x7fffb786d000 -     0x7fffb7875fe7  libsystem_platform.dylib (126.50.8) <897462FD-B318-321B-A554-E61982630F7E>
    0x7fffb7876000 -     0x7fffb7880ff7  libsystem_pthread.dylib (218.60.3) <B8FB5E20-3295-39E2-B5EB-B464D1D4B104>
    0x7fffb7881000 -     0x7fffb7884ff7  libsystem_sandbox.dylib (592.70.2) <19320A42-2E3B-361B-BBDA-2F5F2E87B100>
    0x7fffb7885000 -     0x7fffb7886ff3  libsystem_secinit.dylib (24.50.4) <F78B847B-3565-3E4B-98A6-F7AD40392E2D>
    0x7fffb7887000 -     0x7fffb788effb  libsystem_symptoms.dylib (532.50.47) <3390E07C-C1CE-348F-ADBD-2C5440B45EAA>
    0x7fffb788f000 -     0x7fffb78a2ff7  libsystem_trace.dylib (518.70.1) <AC63A7FE-50D9-3A30-96E6-F6B7FF16E465>
    0x7fffb78a3000 -     0x7fffb78a8ffb  libunwind.dylib (35.3) <3D50D8A8-C460-334D-A519-2DA841102C6B>
    0x7fffb78a9000 -     0x7fffb78d2ff7  libxpc.dylib (972.70.2) <ABC3BB29-BCE6-3E50-8A71-4E56AEE28991>

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 31232
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=258.3M resident=0K(0%) swapped_out_or_unallocated=258.3M(100%)
Writable regions: Total=107.5M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=107.5M(100%)

                                VIRTUAL   REGION
REGION TYPE                        SIZE    COUNT (non-coalesced)
===========                     =======  =======
Accelerate framework               256K        3
Activity Tracing                   256K        2
CG backing stores                 1576K        3
CG image                          4176K        7
CoreAnimation                       56K        8
CoreUI image data                 1388K       11
CoreUI image file                  184K        5
Dispatch continuations            8192K        2
Image IO                            12K        2
Kernel Alloc Once                    8K        2
MALLOC                            66.8M       28
MALLOC guard page                   48K       10
Memory Tag 242                      12K        2
Memory Tag 251                      12K        2
STACK GUARD                       56.0M        5
Stack                             9300K        5
VM_ALLOCATE                        328K       14
__DATA                            21.5M      235
__GLSLBUILTINS                    2588K        2
__IMAGE                            528K        2
__LINKEDIT                       116.5M       19
__TEXT                           141.8M      233
__UNICODE                          556K        2
mapped file                       44.9M       14
shared memory                     16.3M       12
===========                     =======  =======
TOTAL                            492.7M      605

--------------------------End of crash log------------------------------

The compiler used is clang:
Apple LLVM version 9.0.0
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir:

Upon compiling 8.7, the compiler emitted some deprecation warnings.
The first is perhaps relevant, the latter two probably not:

warning: 'OSAtomicCompareAndSwapPtrBarrier'
      is deprecated: first deprecated in macOS 10.12 - Use atomic_compare_exchange_strong() from <stdatomic.h> instead [-Wdeprecated-declarations]
      success = OSAtomicCompareAndSwapPtrBarrier(NULL, newzone,
                ^
note: 'OSAtomicCompareAndSwapPtrBarrier' has been explicitly marked deprecated here
bool    OSAtomicCompareAndSwapPtrBarrier( void *__oldValue, void *__newValue, void * volatile *__theValue );
        ^


note: expanded from macro 'SpinLockUnlock'
#define SpinLockUnlock(p)       OSSpinLockUnlock(p)
                                ^
note: 'OSSpinLockUnlock' has been explicitly marked deprecated here
void    OSSpinLockUnlock( volatile OSSpinLock *__lock );
        ^
warning: 'OSSpinLockLock' is deprecated: first deprecated in macOS 10.12 -
      Use os_unfair_lock_lock() from <os/lock.h> instead [-Wdeprecated-declarations]
    LOCK_NOTIFIER_TSD;
    ^
note: expanded from macro 'LOCK_NOTIFIER_TSD'
#define LOCK_NOTIFIER_TSD       SpinLockLock(&tsdPtr->tsdLock)
                                ^
note: expanded from macro 'SpinLockLock'
#define SpinLockLock(p)         OSSpinLockLock(p)
                                ^
note: 'OSSpinLockLock' has been explicitly marked deprecated here
void    OSSpinLockLock( volatile OSSpinLock *__lock );
        ^
warning: 'OSSpinLockUnlock' is deprecated: first deprecated in macOS 10.12
      - Use os_unfair_lock_unlock() from <os/lock.h> instead [-Wdeprecated-declarations]
    UNLOCK_NOTIFIER_TSD;
    ^

Finally, it seems the pkgs/ build mechanisms are not as well integrated as they ought to be, on two accounts:
1. I experienced problems with old (no longer existing) paths being cached in these directories,
and this caching even caused `make distclean` to fail. (Had to manually locate and delete Makefile and config.status files.)
2. The tests for the pkgs/ required Tcl 8.7 to have been installed, not just built. A ticket I encountered
while searching for previous reports of the segfault bug seemed to suggest that this defect had been
fixed, but apparently not in core-8-branch.