Re: Problems with compilation on Trisquel 5.5

[Sjoerd van Leent]

I found out, as a response to myself that the tag guile-2.0.5 does not share the same issues as the master branch. I will attempt to figure out where and when the problem is introduced, but it will be helpful if anyone knows about a change which might involve different/weird GC behavior.

Regards,
Sjoerd

2012/4/23 Sjoerd van Leent <address@hidden>

Dear readers,

Recently I upgraded my machine to Trisquel 5.5 (x86_64).

While I used Trisquel 5, I had no issues compiling guile, however now it appears all hell broke losoe.

When compiling I get to the generation stage of GEN guile-procedures.texi. The stage ends up with a Segmentation fault. I have been debugging the lt_guile process with gdb, and some interesting things happened. The process received SIGPWR and SIGXCPU signals (in a loop), and eventually ends up with a SIGSEGV message from the procedure: GC_generic_malloc_inner.

I ended up attempting to build the bdw-gc from scratch and link in the 7.1 stable version, but resulting in the same situation.

I have no idea where the problem initiates, as it appears to be happening in a certain time interval (probably thread switching) and there is no way to pinpoint the problem in scheme itself. Even just looping around generates this error.

Now, when I went through the make output I noticed some interesting things while compiling libguile_2.2_la-weak-table.lo:

weak-table.c: In function 'move_disappearing_links':
weak-table.c:164:7: warning: passing argument 1 of 'GC_unregister_disappearing_link' from incompatible pointer type [enabled by default]                                                                                  
/usr/local/include/gc/gc.h:771:12: note: expected 'void **' but argument is of type 'scm_t_bits *'
weak-table.c:165:7: warning: passing argument 1 of 'GC_general_register_disappearing_link' from incompatible pointer type [enabled by default]                                                                            
/usr/local/include/gc/gc.h:744:12: note: expected 'void **' but argument is of type 'scm_t_bits *'
weak-table.c:175:7: warning: passing argument 1 of 'GC_unregister_disappearing_link' from incompatible pointer type [enabled by default]                                                                                  
/usr/local/include/gc/gc.h:771:12: note: expected 'void **' but argument is of type 'scm_t_bits *'
weak-table.c:176:7: warning: passing argument 1 of 'GC_general_register_disappearing_link' from incompatible pointer type [enabled by default]                                                                            
/usr/local/include/gc/gc.h:744:12: note: expected 'void **' but argument is of type 'scm_t_bits *'

And although perhaps less important, when compiling libguile_2.2_la-gc.lo:

gc.c:212:1: warning: 'GC_get_free_space_divisor' defined but not used [-Wunused-function]

As I can't see anyone (yet) having this problem, I consider it might be rather unique, but I really would like to know what possibly could be going wrong and where I should start debugging.