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Fix compilation error due to strict aliasing rules on `i386-unknown-freebsd7.0'.

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* libguile/threads.c (scm_threads_mark_stacks): Cast `&t->regs' to
  `(void *)' rather than `(SCM_STACKITEM *)' to avoid "warning:
  dereferencing type-punned pointer will break strict-aliasing rules"
  with GCC 4.2.1 on `i386-unknown-freebsd7.0'.
This commit is contained in:
Ludovic Courtès 2008-10-10 10:00:21 +02:00
parent f23f643881
commit c18ed8cead
2 changed files with 2 additions and 1 deletions
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1
NEWS
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@ -34,6 +34,7 @@ available: Guile is now always configured in "maintainer mode".
** Fix build issue on Tru64 and ia64-hp-hpux11.23 (`SCM_UNPACK' macro)
** Fix build issue on mips, mipsel, powerpc and ia64 (stack direction)
** Fix build issue on hppa2.0w-hp-hpux11.11 (`dirent64' and `readdir64_r')
** Fix build issue on i386-unknown-freebsd7.0 ("break strict-aliasing rules")
** Fix misleading output from `(help rationalize)'
** Fix build failure on Debian hppa architecture (bad stack growth detection)
** Fix `gcd' when called with a single, negative argument.

2
libguile/threads.c
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@ -1391,7 +1391,7 @@ scm_threads_mark_stacks (void)
#else
scm_mark_locations (t->top, t->base - t->top);
#endif
scm_mark_locations ((SCM_STACKITEM *) &t->regs,
scm_mark_locations ((void *) &t->regs,
((size_t) sizeof(t->regs)
/ sizeof (SCM_STACKITEM)));
}