X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FStaticFlags.hs;h=68c50c8aa6863d1171e4420468c03ab5a3c2530b;hb=526a19e90100eadb36185f3bd2c6ac263b7d25ad;hp=4f4fe6686929cf84566e184c2846d44517df0970;hpb=046ee54f048ddd721dcee41916d6a6f68db3b15b;p=ghc-hetmet.git

diff --git a/compiler/main/StaticFlags.hs b/compiler/main/StaticFlags.hs
index 4f4fe66..68c50c8 100644
--- a/compiler/main/StaticFlags.hs
+++ b/compiler/main/StaticFlags.hs
@@ -52,6 +52,10 @@ module StaticFlags (
 	opt_UF_UpdateInPlace,
 	opt_UF_DearOp,
 
+	-- Related to linking
+	opt_PIC,
+	opt_Static,
+
 	-- misc opts
 	opt_IgnoreDotGhci,
 	opt_ErrorSpans,
@@ -59,18 +63,16 @@ module StaticFlags (
 	opt_HiVersion,
 	opt_HistorySize,
 	opt_OmitBlackHoling,
-	opt_Static,
 	opt_Unregisterised,
 	opt_EmitExternalCore,
-	opt_PIC,
 	v_Ld_inputs,
+	tablesNextToCode
   ) where
 
 #include "HsVersions.h"
 
 import CmdLineParser
-import Config		( cProjectVersionInt, cProjectPatchLevel,
-			  cGhcUnregisterised )
+import Config
 import FastString	( FastString, mkFastString )
 import Util
 import Maybes		( firstJust )
@@ -100,15 +102,32 @@ parseStaticFlags args = do
 		  | otherwise = []
 
   (more_leftover, errs) <- processArgs static_flags (unreg_flags ++ way_flags)
+
+    -- TABLES_NEXT_TO_CODE affects the info table layout.
+    -- Be careful to do this *after* all processArgs,
+    -- because evaluating tablesNextToCode involves looking at the global
+    -- static flags.  Those pesky global variables...
+  let cg_flags | tablesNextToCode = ["-optc-DTABLES_NEXT_TO_CODE"]
+	       | otherwise	  = []
+
   when (not (null errs)) $ ghcError (UsageError (unlines errs))
-  return (more_leftover++leftover)
+  return (cg_flags++more_leftover++leftover)
 
 
--- note that ordering is important in the following list: any flag which
+static_flags :: [(String, OptKind IO)]
+-- All the static flags should appear in this list.  It describes how each
+-- static flag should be processed.  Two main purposes:
+-- (a) if a command-line flag doesn't appear in the list, GHC can complain
+-- (b) a command-line flag may remove, or add, other flags; e.g. the "-fno-X" things
+--
+-- The common (PassFlag addOpt) action puts the static flag into the bunch of
+-- things that are searched up by the top-level definitions like
+--	opt_foo = lookUp FSLIT("-dfoo")
+
+-- Note that ordering is important in the following list: any flag which
 -- is a prefix flag (i.e. HasArg, Prefix, OptPrefix, AnySuffix) will override
 -- flags further down the list with the same prefix.
 
-static_flags :: [(String, OptKind IO)]
 static_flags = [
 	------- GHCi -------------------------------------------------------
      ( "ignore-dot-ghci", PassFlag addOpt )
@@ -127,7 +146,6 @@ static_flags = [
  	-- ToDo: user ways
 
 	------ Debugging ----------------------------------------------------
-  ,  ( "dppr-noprags",     PassFlag addOpt )
   ,  ( "dppr-debug",       PassFlag addOpt )
   ,  ( "dppr-user-length", AnySuffix addOpt )
       -- rest of the debugging flags are dynamic
@@ -282,14 +300,22 @@ opt_UF_UpdateInPlace		= lookUp  FSLIT("-funfolding-update-in-place")
 
 opt_UF_DearOp   = ( 4 :: Int)
 			
+opt_PIC                         = lookUp FSLIT("-fPIC")
 opt_Static			= lookUp  FSLIT("-static")
 opt_Unregisterised		= lookUp  FSLIT("-funregisterised")
+
+-- Derived, not a real option.  Determines whether we will be compiling
+-- info tables that reside just before the entry code, or with an
+-- indirection to the entry code.  See TABLES_NEXT_TO_CODE in 
+-- includes/InfoTables.h.
+tablesNextToCode 		= not opt_Unregisterised
+		 		  && cGhcEnableTablesNextToCode == "YES"
+
 opt_EmitExternalCore		= lookUp  FSLIT("-fext-core")
 
 -- Include full span info in error messages, instead of just the start position.
 opt_ErrorSpans			= lookUp FSLIT("-ferror-spans")
 
-opt_PIC                         = lookUp FSLIT("-fPIC")
 
 -- object files and libraries to be linked in are collected here.
 -- ToDo: perhaps this could be done without a global, it wasn't obvious