devel/libunwind: fix build with clang 15
Building libunwind with clang results in multiple errors:
setjmp/siglongjmp.c:111:48: error: incompatible pointer to integer conversion passing 'unw_word_t *' (aka 'unsigned long *') to parameter of type 'unw_word_t' (aka 'unsigned long'); remove & [-Wint-conversion]
if (unw_set_reg (&c, UNW_REG_EH + 2, &wp[JB_MASK]) < 0)
^~~~~~~~~~~~
../include/libunwind-common.h:283:56: note: passing argument to parameter here
extern int unw_set_reg (unw_cursor_t *, int, unw_word_t);
^
dwarf/Gparser.c:901:5: error: call to undeclared function '_Ux86_64_stash_frame'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
tdep_stash_frame (c, rs);
^
../include/tdep-x86_64/libunwind_i.h:246:41: note: expanded from macro 'tdep_stash_frame'
#define tdep_stash_frame UNW_OBJ(stash_frame)
^The first error is because the syntax is indeed wrong, the '&' should be
removed.
The second error is because tdep_stash_frame() is only declared for
Linux in libunwind_i.h, but it is used in Gparser.c. Declare it
unconditionally to fix the problem.
PR: 265519
Approved by: sunpoet (maintainer)
MFH: 2022Q3