-fext-core doesn't generate .hcr when .o and .hi files are present

[kmels]

Create a file inside a directory and compile it using -fext-core:

cd /tmp/
mkdir dir
echo "module Main where main = return ()" > dir/Main.hs
ghc --make -fext-core dir/Main.hs 
[1 of 1] Compiling Main             ( dir/Main.hs, dir/Main.o )
Linking dir/Main ...
kmels@kmels-workstelle /tmp $ ls dir/
Main  Main.hcr  Main.hi  Main.hs  Main.o

If the .hcr file is deleted and our program is compiled again with -fext-core, no .hcr file will be generated:

rm dir/Main.hcr 
ghc --make -fext-core dir/Main.hs 
ls dir/
Main  Main.hi  Main.hs  Main.o

The file is generated if you 1. cd to dir/ and 2. ghc --make -fext-core Main.hs

[igloo]

Thanks for the report