do not link executables with executable stack flag set (#973512)

- upstream patch by Edward Z Yang
- http://ghc.haskell.org/trac/ghc/ticket/703
- note this changes the ABI hash of the ghc library

ghc-7.6-driver-Disable-executable-stack-for-the-linker-note.patch

@@ -0,0 +1,37 @@
+From 08a38628f29df63ac842f4d083efb414f42d7bff Mon Sep 17 00:00:00 2001
+From: "Edward Z. Yang" <ezyang@mit.edu>
+Date: Tue, 9 Jul 2013 00:01:43 -0700
+Subject: [PATCH] Disable executable stack for the linker note, fixing #703
+ (again)
+
+Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
+---
+ compiler/main/DriverPipeline.hs | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/compiler/main/DriverPipeline.hs b/compiler/main/DriverPipeline.hs
+index 67377e6..26425ae 100644
+--- a/compiler/main/DriverPipeline.hs
++++ b/compiler/main/DriverPipeline.hs
+@@ -1640,7 +1640,17 @@ mkNoteObjsToLinkIntoBinary dflags dep_packages = do
+                                    text elfSectionNote,
+                                    text "\n",
+ 
+-          text "\t.ascii \"", info', text "\"\n" ]
++          text "\t.ascii \"", info', text "\"\n",
++
++          -- ALL generated assembly must have this section to disable
++          -- executable stacks.  See also
++          -- compiler/nativeGen/AsmCodeGen.lhs for another instance
++          -- where we need to do this.
++          (if platformHasGnuNonexecStack (targetPlatform dflags)
++           then text ".section .note.GNU-stack,\"\",@progbits\n"
++           else empty)
++
++           ]
+           where
+             info' = text $ escape info
+ 
+-- 
+1.8.1.2
+

ghc.spec

@@ -25,7 +25,7 @@ Version: 7.6.3
 # - release can only be reset if *all* library versions get bumped simultaneously
 #   (sometimes after a major release)
 # - minor release numbers for a branch should be incremented monotonically
-Release: 21%{?dist}
+Release: 22%{?dist}
 Summary: Glasgow Haskell Compiler
 
 License: %BSDHaskellReport
@@ -56,6 +56,8 @@ Patch15: ghc-64bit-bigendian-rts-hang-989593.patch
 Patch16: ghc-cabal-unversion-docdir.patch
 # fix libffi segfaults on 32bit (upstream in 7.8)
 Patch17: ghc-7.6.3-rts-Adjustor-32bit-segfault.patch
+# add .note.GNU-stack to assembly output to avoid execstack (#973512)
+Patch18: ghc-7.6-driver-Disable-executable-stack-for-the-linker-note.patch
 
 # fedora ghc has been bootstrapped on
 # %{ix86} x86_64 ppc alpha sparcv9 ppc64 armv7hl armv5tel s390 s390x
@@ -245,6 +247,8 @@ ln -s $(pkg-config --variable=includedir libffi)/*.h rts/dist/build
 
 %patch17 -p0 -b .orig
 
+%patch18 -p1 -b .orig
+
 %global gen_contents_index gen_contents_index.orig
 %if %{undefined without_haddock}
 if [ ! -f "libraries/%{gen_contents_index}" ]; then
@@ -476,6 +480,11 @@ fi
 
 
 %changelog
+* Thu Jan 30 2014 Jens Petersen <petersen@redhat.com> - 7.6.3-22
+- do not set executable stack on executables (#973512)
+  (upstream patch by Edward Z Yang)
+- note this patch changes the ABI hash of the ghc library
+
 * Wed Jan 29 2014 Jens Petersen <petersen@redhat.com> - 7.6.3-21
 - fix segfault on i686 when using ffi double-mapping for selinux (#907515)
   see http://hackage.haskell.org/trac/ghc/ticket/7629