Bug 18010 – Undefined reference to _d_arraycopy when copying arrays in -betterC

From: http://forum.dlang.org/post/[email protected] --------------------------------- 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 /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 add -noboundscheck flag all works fine.

(In reply to Mike from comment #0) --------------------------- > > If I add -noboundscheck flag all works fine. Actually there's a random return code, the test case you provided is a "compilable" test. "runnable" is rather (after reduction) --- extern (C) int main() { char[256] buf; char[] str; buf[0..0] = str[0..0]; return 0; } ---

> -noboundscheck The trouble is dmd is relying on _d_arraycopy() to do the bounds check, and just uses memcpy() otherwise.

Commits pushed to master at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/d075a24e726e6567e09a4a9a3164d7ab74cd2e66 fix Issue 18010 - Undefined reference to _d_arraycopy when copying arrays in -betterC https://github.com/dlang/dmd/commit/50fc827eaa9b8e4d0ca932f939051c0c6c63043c Merge pull request #7867 from WalterBright/fix18010 fix Issue 18010 - Undefined reference to _d_arraycopy when copying ar…