Debug out-of-range make_fixnum args

With --enable-checking, make_fixnum (N) now checks that N is
in fixnum range.  Suggested by Pip Cet in:
https://lists.gnu.org/r/emacs-devel/2019-07/msg00548.html
A new function make_ufixnum (N) is for the rare cases where N
is intended to be unsigned and is in the range 0..INTMASK.
* configure.ac (AC_C_TYPEOF): Add.
(HAVE_STATEMENT_EXPRESSIONS): Resurrect this macro.
* src/fns.c (Frandom, hashfn_eq, hashfn_equal, hashfn_user_defined):
* src/profiler.c (hashfn_profiler):
Use make_ufixnum rather than make_fixum, since the argument is
an unsigned integer in the range 0..INTMASK rather than a signed
integer in the range MOST_NEGATIVE_FIXNUM..MOST_POSITIVE_FIXNUM.
Typically this is for hashes.
* src/lisp.h (lisp_h_make_fixnum_wrap) [USE_LSB_TAG]:
Rename from lisp_h_make_fixnum.
(lisp_h_make_fixnum): Redefine in terms of lisp_h_make_fixnum_wrap.
Check for fixnum overflow on compilers like GCC that
have statement expressions and typeof.
(FIXNUM_OVERFLOW_P): Move up.
(make_fixnum): Check for fixnum overflow.
(make_ufixnum): New function, which checks that the arg
fits into 0..INTMASK range.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/profiler.c b/src/profiler.c
index 6b482abf335..6943905062c 100644
--- a/src/profiler.c
+++ b/src/profiler.c
@@ -566,7 +566,7 @@ hashfn_profiler (Lisp_Object bt, struct Lisp_Hash_Table *h)
     }
   else
     hash = XHASH (bt);
-  return make_fixnum (SXHASH_REDUCE (hash));
+  return make_ufixnum (SXHASH_REDUCE (hash));
 }
 
 static void syms_of_profiler_for_pdumper (void);