itypes: remove silly itypes_little_endian.

Curiously, the itypes_little_endian variable was introduced in
April 2017, in a the first commit implementing buffers. The
variable was initialized, but never referenced.  About a month
after that, I introduced HAVE_LITTLE_ENDIAN config.h macro,
which is always present and defined as 0 or 1. This was used
right away in the implementation of FFI bitfields, and later
on in other FFI work.  In spite of HAVE_LITTLE_ENDIAN, almost
exactly a year after itypes_little_endian was introduced, I
mistakenly put that variable to use instead of recognizing it
as superfluous and removing it in favor of using
HAVE_LITTLE_ENDIAN. That is what I'm doing now.

* itypes.c (itypes_little_endian): Variable removed.
(itypes_init): Function removed, since its only job is to
initialize this variable.

* itypesl.h (itypes_little_endian, itypes_init): Declarations
removed.

* lib.c (init): Call to itypes_init removed.

* parser.c (read_file_common): Instead of
itypes_little_indian, use HAVE_LITTLE_ENDIAN, which
the configuration script always exists and is defined
as 0 or 1.

4 files changed, 2 insertions, 21 deletions

diff --git a/itypes.c b/itypes.c
index ba8705e2..51cbb7cd 100644
--- a/itypes.c
+++ b/itypes.c
@@ -35,8 +35,6 @@
 #include "arith.h"
 #include "itypes.h"
 
-int itypes_little_endian;
-
 #if HAVE_I8
 i8_t c_i8(val n, val self)
 {
@@ -263,16 +261,3 @@ unsigned long c_ulong(val n, val self)
 #error portme
 #endif
 }
-
-extern int itypes_little_endian;
-void itypes_init(void);
-
-void itypes_init()
-{
-  union u {
-    volatile unsigned ui;
-    volatile unsigned char uc[sizeof (unsigned)];
-  } u = { 0xff };
-
-  itypes_little_endian = (u.uc[0] == 0xff);
-}
diff --git a/itypes.h b/itypes.h
index 0991b1cd..5cbc3ea1 100644
--- a/itypes.h
+++ b/itypes.h
@@ -116,6 +116,3 @@ unsigned int c_uint(val, val self);
 
 long c_long(val, val self);
 unsigned long c_ulong(val, val self);
-
-extern int itypes_little_endian;
-void itypes_init(void);
diff --git a/lib.c b/lib.c
index 486ceee8..c2180abb 100644
--- a/lib.c
+++ b/lib.c
@@ -13086,7 +13086,6 @@ void init(val *stack_bottom)
   hash_init();
   struct_init();
   tree_init();
-  itypes_init();
   buf_init();
   ffi_init();
   sysif_init();
diff --git a/parser.c b/parser.c
index 7698ac24..c1984a07 100644
--- a/parser.c
+++ b/parser.c
@@ -753,8 +753,8 @@ static val read_file_common(val self, val stream, val error_stream, val compiled
         val datavec = pop(&item);
         val funvec = car(item);
         val desc = vm_make_desc(nlevels, nregs, bytecode, datavec, funvec);
-        if ((big_endian && itypes_little_endian) ||
-            (!big_endian && !itypes_little_endian))
+        if ((big_endian && HAVE_LITTLE_ENDIAN) ||
+            (!big_endian && !HAVE_LITTLE_ENDIAN))
           buf_swap32(bytecode);
         (void) vm_execute_toplevel(desc);
         gc_hint(desc);