Bug 17898 – Segfault in compile with -deps and -unittest

Reported by Dhananjay at http://forum.dlang.org/post/[email protected] Sample program "test.d": import std.stdio : writeln; unittest { writeln("Unittest"); } void main() { writeln("Main"); } Command: dmd -deps=deps.csv -unittest test.d Output: Segmentation fault: 11 OS: Mac OS X 10.11.6. Has also been reproduced on linux/x64. DMD version: 2.076.1 The error goes away if -unittest or -deps is not passed.

PS: This is also observed in DMD 2.075.1 but not on DMD 2.074.1

Tracked this regression down to a deps pull by bisecting dmd: https://github.com/dlang/dmd/pull/6748 Reverting that commit fixes this issue and supposedly the similar deps bug 17601 too.

Also crashes with `-debug -deps`, somewhere in IR gen.

@MartinNowak updated dlang/dmd pull request #9122 "Fix Issue 17898 - Segfault in compile with -deps and -debug/unittest" fixing this issue: - Fix Issue 17898 - Segfault in compile with -deps and -debug/unittest Revert "Merge pull request #6748 from RazvanN7/Fix_Issue_7016" This reverts commit afebe0c2ba89594b434d676fbe0c050389a5b48c, reversing changes made to a91bc973217924a47c46aca7012c10b8762bd26b. The original change was apparently never used for rdmd and made `-deps` unusable due to causing segfault during IR-gen. Furthermore the PR killed a common use-case for the `-deps` switch, collecting shallow dependencies for make et.al. And lastly https://dlang.org/changelog/2.079.0.html#includeimports added an alternative implementation for recursive compilation, so recursive dependencies are no longer needed for rdmd. I'm also not aware of any other user of recursive dependencies. https://github.com/dlang/dmd/pull/9122

Closing this as a WORKSFORME as I can't reproduce.