[commit: ghc] master: On OS X x86_64, use "-Wl, -no_pie" and "-Wl, -no_compact_unwind" to avoid linker warnings (30ccc9f)

[Manuel Chakravarty]

Repository : ssh://darcs.haskell.org//srv/darcs/ghc

On branch  : master

http://hackage.haskell.org/trac/ghc/changeset/30ccc9f39dd2cf1ad14e6116778aa1fd94526c19

>---------------------------------------------------------------

commit 30ccc9f39dd2cf1ad14e6116778aa1fd94526c19
Author: Manuel M T Chakravarty <chak at cse.unsw.edu.au>
Date:   Wed Jul 27 23:05:01 2011 +1000

    On OS X x86_64, use "-Wl,-no_pie" and "-Wl,-no_compact_unwind" to avoid linker warnings
    
    - "-Wl,-no_pie" can be removed once GMP gets updated

>---------------------------------------------------------------

 compiler/main/DriverPipeline.hs |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/compiler/main/DriverPipeline.hs b/compiler/main/DriverPipeline.hs
index b328c3f..b1f50ac 100644
--- a/compiler/main/DriverPipeline.hs
+++ b/compiler/main/DriverPipeline.hs
@@ -1666,6 +1666,17 @@ linkBinary dflags o_files dep_packages = do
                           then ["-Wl,--enable-auto-import"]
                           else [])
 
+                      -- '-no_pie' - On OS X, the linker otherwise complains that it cannot build 
+                      --             position independent code due to some offensive code in GMP.
+                      -- '-no_compact_unwind'
+                      --           - C++/Objective-C exceptions cannot use optimised stack
+                      --             unwinding code (the optimised form is the default in Xcode 4 on
+                      --             x86_64).
+                      ++ (if platformOS   (targetPlatform dflags) == OSDarwin   && 
+                             platformArch (targetPlatform dflags) == ArchX86_64
+                          then ["-Wl,-no_pie", "-Wl,-no_compact_unwind"]
+                          else [])
+
                       ++ o_files
                       ++ extra_ld_inputs
                       ++ lib_path_opts