Add "ipe" flavour transformer to add support for building with IPE debug infowip/ipe-trans

The "ipe" transformer compilers everything in stage2 with
`-finfo-table-map` and `-fdistinct-constructor-tables` to produce a
compiler which is usable with `-hi` profiling and ghc-debug.

2 files changed, 18 insertions, 0 deletions

diff --git a/hadrian/doc/flavours.md b/hadrian/doc/flavours.md
index 806fe8ab81..d88122ea3f 100644
--- a/hadrian/doc/flavours.md
+++ b/hadrian/doc/flavours.md
@@ -220,6 +220,15 @@ The supported transformers are listed below:
         <td><code>no_profiled_libs</code></td>
         <td>Disables building of libraries in profiled build ways.</td>
     </tr>
+    <tr>
+        <td><code>omit_pragmas</code></td>
+        <td>Build the stage2 compiler with -fomit-interface-pragmas to reduce
+        recompilation.</td>
+    </tr>
+    <tr>
+        <td><code>ipe</code></td>
+        <td>Build the stage2 libraries with IPE debugging information for use with -hi profiling.</td>
+    </tr>
 </table>
 
 ## Ways
diff --git a/hadrian/src/Flavour.hs b/hadrian/src/Flavour.hs
index bacc6b3ed2..3a23fd878f 100644
--- a/hadrian/src/Flavour.hs
+++ b/hadrian/src/Flavour.hs
@@ -44,6 +44,7 @@ flavourTransformers = M.fromList
     , "no_dynamic_ghc" =: disableDynamicGhcPrograms
     , "no_profiled_libs" =: disableProfiledLibs
     , "omit_pragmas" =: omitPragmas
+    , "ipe" =: enableIPE
     ]
   where (=:) = (,)
 
@@ -190,6 +191,14 @@ omitPragmas =
       Right transformer = applySetting kv
   in transformer
 
+-- | Build stage2 dependencies with options to enable IPE debugging
+-- information.
+enableIPE :: Flavour -> Flavour
+enableIPE =
+  let Right kv = parseKV "stage1.*.ghc.hs.opts += -finfo-table-map -fdistinct-constructor-tables"
+      Right transformer = applySetting kv
+  in transformer
+
 -- * CLI and <root>/hadrian.settings options
 
 {-