https://issues.dlang.org/show_bug.cgi?id=18275
Issue ID: 18275 Summary: dmd deletes source file fun.cpp with `dmd fun.cpp.o main.d` Product: D Version: D2 Hardware: x86 OS: All Status: NEW Severity: critical Priority: P1 Component: dmd Assignee: nob...@puremagic.com Reporter: timothee.co...@gmail.com ``` fun.cpp:extern"C" void test(){} main.d:extern(C) void test(); void main(){} ``` clang++ -o fun.cpp.o -c fun.cpp dmd fun.cpp.o main.d (same bug with ldc2) this caused https://github.com/Syniurge/Calypso/issues/59 proposed fix: if `-of` explicitly passed on cmd line, fine, nothing to check if not, infer output file as we already do, but first assert(!file.exists) (regardless of what type of file it is, that's irrelevant) downside: dmd main2.d #creates main2 dmd main2.d #error main2 already exists, please specify -of=main2 explicitly to force write I think the downside is not as bad as the bug I reported which deletes source code and can be very damaging if the file wasn't backed up in its latest form, which is common in edit/compile/debug cycles --