On Wednesday, 22 November 2017 at 15:10:40 UTC, Oleg B wrote:
Hello. I try compile simple example:
import core.stdc.stdio;
import std.algorithm : min;
extern (C) void main()
{
char[256] buf;
buf[] = '\0';
auto str = "hello world";
auto ln = min(buf.length, str.length);
buf[0..ln] = str[0..ln];
printf("%s\n", buf.ptr);
}
rdmd -betterC bettercarray2.d
and get error:
/tmp/.rdmd-1000/rdmd-bettercarray2.d-435C14EC3DAF09FFABF8ED6919B624C1/objs/bettercarray2.o:
In function `main':
bettercarray2.d:(.text.main[main]+0xbc): undefined reference to
`_d_arraycopy'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
If I understand correctly _d_arraycopy is part of druntime and
it check bounds of array access.
If I add -noboundscheck flag all works fine.
dmd version is 2.076.1
Why -betterC flag not 'include' -noboundscheck flag?
It's bug or in some cases it's useful?
betterC is a new feature that's still being worked on and still
has holes in it:
https://github.com/dlang/dmd/pull/7151
I suggest you open an issue for it on bugzilla, as this sounds
like either a hole or at least something that should be
documented better:
https://issues.dlang.org
