r249562 - in /trunk: gcc/go/gofrontend/MERGE li...

[ian@gcc.gnu.org]

Author: ian
Date: Thu Jun 22 14:46:12 2017
New Revision: 249562

URL: https://gcc.gnu.org/viewcvs?rev=249562&root=gcc&view=rev
Log:
    runtime: don't assume that _ = *s will panic if s is nil
    
    With the gc toolchain apparently
            var s *string
            _ = *s
    is enough to panic with a nil pointer dereference. The gccgo compiler
    will simply discard the dereference, which I think is a reasonable and
    acceptable optimization. Change the tests to use an exported variable
    instead. The tests are not currently run, but they will be with a
    later patch to gotools.
    
    Reviewed-on: https://go-review.googlesource.com/46450

Modified:
    trunk/gcc/go/gofrontend/MERGE
    trunk/libgo/go/runtime/testdata/testprog/crash.go
    trunk/libgo/go/runtime/testdata/testprogcgo/crash.go