tree e80d9bb49033b67cf089dbc3eda5cde1ad2545d1
parent a3a3c3a2d1bc6a8ca51b302d08c94ef27cdd8f0f
author Ian Lance Taylor <iant@golang.org> 1687211874 -0700
committer Ian Lance Taylor <iant@golang.org> 1687280087 +0000

runtime: use a C function to call mmap

The final argument to mmap, of type off_t, varies.
In CL 445375 we changed it to always use the C off_t type,
but that broke 32-bit big-endian Linux systems.  On those systems,
using the C off_t type requires calling the mmap64 function.
In C this is automatically handled by the <sys/mman.h> file.
In Go, we would have to change the magic //extern comment to
call mmap64 when appropriate.  Rather than try to get that right,
we instead go through a C function that uses C implicit type
conversions to pick the right type.

Fixes https://gcc.gnu.org/PR110297

Change-Id: Id54ece0c64601c060e335e96e6b76f4d5f002ae8
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/504415
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>