Working 4.05.x branch

---------------------

- MPR#7639, GPR#1371: fix configure script for correct detection of

int64 alignment on Mac OS X 10.13 (High Sierra) and above; fix bug in

configure script relating to such detection.

(Mark Shinwell, report by John Whitington, review by Xavier Leroy)

- MPR#7591, GPR#1257: on x86-64, frame table is not 8-aligned

(Xavier Leroy, report by Mantis user "voglerr", review by Gabriel Scherer)

#if defined(ARCH_INT64_TYPE)

typedefARCH_INT64_TYPEint64_t;

typedefARCH_INT64_TYPEmyint64_t;

typedeflongint64_t;

typedeflongmyint64_t;

typedeflong longint64_t;

typedeflong longmyint64_t;

#error "No 64-bit integer type available"

volatileint64_tfoo;

volatilemyint64_tfoo;

voidaccess_int64(volatileint64_t*p)

voidaccess_int64(volatilemyint64_t*p)

{

foo=*p;

}

signal(SIGBUS,sig_handler);

if(setjmp(failure)==0) {

access_int64((volatileint64_t*)n);

access_int64((volatileint64_t*) (n+1));

access_int64((volatilemyint64_t*)n);

access_int64((volatilemyint64_t*) (n+1));

res=0;

}else {

res=1;

"64-bit integers. I'm going to assume this architecture has\n" \

"alignment constraints. That's a safe bet: OCaml will work\n" \

"even if this architecture has actually no alignment\n" \

echo"#define ARCH_ALIGN_INT64">> m.h;;