Move Hadrian executable to /hadrian.

.gitignore

-/.shake/
 /.db/
 cfg/system.config
 
+# build.bat and build.sh specific
+/hadrian
+/hadrian.exe
+
 # build.cabal.sh specific
 /dist/
 /.cabal-sandbox/

.travis.yml

@@ -48,8 +48,6 @@ install:
     # ".git"  directory into the appropriate location, and perform a hard reset
     # in order to regenerate the GHC-Shake files.
     - mkdir ghc/hadrian
-    - mkdir ghc/_build
-    - mkdir ghc/_build/hadrian
     - mv .git ghc/hadrian
     - ( cd ghc/hadrian && git reset --hard HEAD )
 

appveyor.yml

@@ -36,9 +36,6 @@ install:
     - alex  --version
     - happy --version
     - stack exec -- ghc-pkg list
-    - mkdir _build
-    - cd _build
-    - mkdir hadrian
 
 build_script:
     - cd C:\msys64\home\ghc\hadrian

build.bat

 @cd %~dp0
-@mkdir ../_build 2> nul
+@mkdir ../_build/hadrian 2> nul
 
 @set ghcArgs=--make                       ^
              -Wall                        ^
@@ -13,7 +13,7 @@
              -outputdir=../_build/hadrian ^
              -j                           ^
              -O                           ^
-             -o ../_build/hadrian
+             -o hadrian
 
 @set hadrianArgs=--lint      ^
                  --directory ^
@@ -27,4 +27,4 @@
 
 @rem Unset GHC_PACKAGE_PATH variable, as otherwise ghc-cabal complains
 @set GHC_PACKAGE_PATH=
-@..\_build\hadrian %hadrianArgs%
+@hadrian %hadrianArgs%

build.sh

@@ -30,7 +30,7 @@ function rl {
 
 root="$(dirname "$(rl "$0")")"
 
-mkdir -p "$root/../_build"
+mkdir -p "$root/../_build/hadrian"
 
 ghc                                      \
     "$root/src/Main.hs"                  \
@@ -43,9 +43,9 @@ ghc                                      \
     -threaded                            \
     -outputdir="$root/../_build/hadrian" \
     -j -O                                \
-    -o "$root/../_build/hadrian"
+    -o "$root/hadrian"
 
-"$root/../_build/hadrian"  \
+"$root/hadrian"            \
     --lint                 \
     --directory "$root/.." \
     --colour               \

src/Rules/Clean.hs

@@ -17,8 +17,7 @@ clean dir = do
 cleanRules :: Rules ()
 cleanRules = do
     "clean" ~> do
-        forM_ [Stage0 ..] $ \stage -> clean (buildRootPath -/- stageString stage)
-        clean (buildRootPath -/- "hadrian")
+        clean buildRootPath
         clean programInplacePath
         clean "inplace/lib"
         clean derivedConstantsPath