[Openmcl-devel] freshly built wx86cl64.exe crashes on start

[Bharat Shetty]

Hi,

I built ccl (downloaded the 1.12.1 zip file from github)on

   - Windows 10 (cygwin)
   - gcc version 11.3.0
   - ld/binutils version 2.39
   - debug flag changed to -g3 in Makefile
   - code optimisation level set to -O0 (zero) also in Makefile


When the exe was built i got a message that section /1, /8 and /32 are
before text. I altered the pei-x86-64.x to include the new debug
sections(upto dwarf 5). For this i generated the default script running ld
--verbose. retained .Copied .spfoo from the original, removed KEEP() and
most of the SORT() unless it was present in the original file. Besides this
I had to add *-no-pie and -Wl,--allow-multiple-definition* to the build
rule for wx86cl64.exe target. I have not made any changes to the source
code. This got an exe that starts.

However every time I run this, it crashes at calculate_relocation in
x86-gc.c. The back trace is as follows:
#0  0x0000000000031d56 in calculate_relocation () at ../x86-gc.c:1571
#1  0x000000000002ea15 in gc (tcr=0x5acebc0, param=0) at ../gc-common.c:1821
#2  0x000000000003a170 in gc_from_tcr (tcr=0x5acebc0, param=0) at
../x86-exceptions.c:3014
#3  0x000000000003a06b in gc_like_from_xp (xp=0x25f6f570, fun=0x3a126
<gc_from_tcr>, param=0) at ../x86-exceptions.c:2970
#4  0x000000000003a1ce in gc_from_xp (xp=0x25f6f570, param=0) at
../x86-exceptions.c:3026
#5  0x0000000000035c0f in allocate_object (xp=0x25f6f570, bytes_needed=16,
disp_from_allocptr=13, tcr=0x5acebc0, crossed_threshold=0x25f6f1ec) at
../x86-exceptions.c:171
#6  0x0000000000036f26 in handle_alloc_trap (xp=0x25f6f570, tcr=0x5acebc0,
notify=0x25f6f1ec) at ../x86-exceptions.c:665
#7  0x0000000000037f15 in handle_exception (signum=11, info=0x25f6f4d8,
context=0x25f6f570, tcr=0x5acebc0, old_valence=0) at
../x86-exceptions.c:1215
#8  0x0000000000038cf3 in windows_exception_handler
(exception_pointers=0x25f6f4c0, tcr=0x5acebc0, signal_number=11) at
../x86-exceptions.c:2150
#9  0x00000000000438dd in windows_switch_to_foreign_stack () at
../x86-asmutils64.s:263
#10 0x0000000025f6f4c0 in ?? ()

This happens after start_lisp is called. By the time the code reaches gc.c
global_reloctab is reset (set to 0x7cfe000000 before entering start_lisp).
Due to this GCrelocptr is also set to 0x0 in gc-common.c. This results in
relocptr being set to 0x0 in calculate_relocation.
Also GCndynamic_dnodes_in_area is also 0 at this point(in the downloaded
version it is 2048 at this point).

Does anyone know why these global variables are reset ? And how can I fix
this? I suspect this is because of the newer versions of gcc and ld.

Regards,
Bharat
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