dev-lang/ghc: restore missing binutils-2.13 patch

Reported-by: Toralf Förster
Closes: https://bugs.gentoo.org/657712
Package-Manager: Portage-2.3.40, Repoman-2.3.9

1 files changed, 65 insertions, 0 deletions

diff --git a/dev-lang/ghc/files/ghc-8.0.2-binutils-2.30.patch b/dev-lang/ghc/files/ghc-8.0.2-binutils-2.30.patch
new file mode 100644
index 000000000000..f02cb238c6b9
--- /dev/null
+++ b/dev-lang/ghc/files/ghc-8.0.2-binutils-2.30.patch
@@ -0,0 +1,65 @@
+From 358b508051333882d4099acca8f269e6fb2b7d65 Mon Sep 17 00:00:00 2001
+From: Bertram Felgenhauer <int-e@gmx.de>
+Date: Thu, 3 May 2018 18:03:53 +0300
+Subject: [PATCH] Compute DW_FORM_block length correctly; also fixes #15068
+
+Before this patch, the pprUnwindwExpr function computed the length of
+by the following assembly fragment:
+
+	.uleb128 1f-.-1
+	<expression data>
+1:
+
+That is, to compute the length, it takes the difference of the label 1
+and the address of the .uleb128 directive, and subtracts 1.
+
+In #15068 it was reported that `as` from binutils 4.30 has trouble with
+evaluating the `.` part of the expression. However, there is actually a
+problem with the expression, if the length of the data ever becomes
+larger than 128: In that case, the .uleb128 directive will emit more
+than 1 byte, and the computed length will be wrong.
+
+The present patch changes the assembly fragment to use two labels,
+which fixes both these problems.
+
+	.uleb128 2f-1f
+1:
+	<expression data>
+2:
+
+Test Plan: validate
+
+Reviewers: bgamari, osa1
+
+Reviewed By: bgamari
+
+Subscribers: thomie, carter
+
+GHC Trac Issues: #15068
+
+Differential Revision: https://phabricator.haskell.org/D4654
+---
+ compiler/nativeGen/Dwarf/Types.hs | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/compiler/nativeGen/Dwarf/Types.hs b/compiler/nativeGen/Dwarf/Types.hs
+index 23a2c920e7..579ed0d256 100644
+--- a/compiler/nativeGen/Dwarf/Types.hs
++++ b/compiler/nativeGen/Dwarf/Types.hs
+@@ -492,9 +492,11 @@ pprUnwindExpr spIsCFA expr
+         pprE (UwPlus u1 u2)   = pprE u1 $$ pprE u2 $$ pprByte dW_OP_plus
+         pprE (UwMinus u1 u2)  = pprE u1 $$ pprE u2 $$ pprByte dW_OP_minus
+         pprE (UwTimes u1 u2)  = pprE u1 $$ pprE u2 $$ pprByte dW_OP_mul
+-    in text "\t.uleb128 1f-.-1" $$ -- DW_FORM_block length
++    in text "\t.uleb128 2f-1f" $$ -- DW_FORM_block length
++       -- computed as the difference of the following local labels 2: and 1:
++       text "1:" $$
+        pprE expr $$
+-       text "1:"
++       text "2:"
+ 
+ -- | Generate code for re-setting the unwind information for a
+ -- register to @undefined@
+-- 
+2.17.0
+