configure.ac: Remove checks for bug 9439

Bug #9439 only affects some ghc 7.8 versions of the compiler and since
git HEAD no longer builds with ghc-7.8 we can drop this check.

Test Plan: Works here!

Reviewers: hvr, austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2427

2 files changed, 0 insertions, 74 deletions

diff --git a/Makefile b/Makefile
index 82ab2f78f6..9b888e7cca 100644
--- a/Makefile
+++ b/Makefile
@@ -77,13 +77,6 @@ default : all
 help:
 	@cat MAKEHELP.md
 
-# Verify that stage 0 LLVM backend isn't affected by Bug #9439 if needed
-ifeq "$(GHC_LLVM_AFFECTED_BY_9439)" "1"
-ifneq "$(findstring -fllvm,$(SRC_HC_OPTS) $(GhcHcOpts) $(GhcStage1HcOpts))" ""
-$(error Stage 0 compiler is affected by Bug #9439. Refusing to bootstrap with -fllvm)
-endif
-endif
-
 # No need to update makefiles for these targets:
 # (the ones we're filtering out)
 REALGOALS=$(filter-out \
diff --git a/configure.ac b/configure.ac
index f4b839e523..e9569e93d8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -544,73 +544,6 @@ dnl --------------------------------------------------------------
 
 
 dnl --------------------------------------------------------------
-dnl * General configuration checks
-dnl --------------------------------------------------------------
-
-dnl ** Bug 9439: Some GHC 7.8 releases had broken LLVM code generator.
-dnl Unfortunately we don't know whether the user is going to request a
-dnl build with the LLVM backend as this is only given in build.mk.
-dnl
-dnl Instead, we try to do as much work as possible here, checking
-dnl whether -fllvm is the stage 0 compiler's default. If so we
-dnl fail. If not, we check whether -fllvm is affected explicitly and
-dnl if so set a flag. The build system will later check this flag
-dnl after the desired build flags are known.
-
-dnl This problem is further complicated by the fact that the llvm
-dnl version used by the bootstrap compiler may be different from the
-dnl version we arre trying to compile GHC against. Therefore, we need
-dnl to find the boostrap compiler's `settings` file then check to see
-dnl if the `opt` and `llc` command strings are non-empty and if these
-dnl programs exist. Only if they exist to we test for bug #9439.
-
-FIND_GHC_BOOTSTRAP_PROG([BootstrapLlcCmd], [${WithGhc}], "LLVM llc command")
-FIND_GHC_BOOTSTRAP_PROG([BootstrapOptCmd], [${WithGhc}], "LLVM opt command")
-
-if test -n "$BootstrapLlcCmd" && test -n "$BootstrapOptCmd"
-then
-    AC_MSG_CHECKING(whether bootstrap compiler is affected by bug 9439)
-    echo "main = putStrLn \"%function\"" > conftestghc.hs
-
-    # Check whether LLVM backend is default for this platform
-    "${WithGhc}" -pgmlc="${BootstrapLlcCmd}" -pgmlo="${BootstrapOptCmd}" conftestghc.hs 2>&1 >/dev/null
-    res=`./conftestghc`
-    if test "x$res" = "x%object"
-    then
-        AC_MSG_RESULT(yes)
-        echo "Buggy bootstrap compiler"
-        echo ""
-        echo "The stage 0 compiler $WithGhc is affected by GHC Bug \#9439"
-        echo "and therefore will miscompile the LLVM backend if -fllvm is"
-        echo "used."
-        echo
-        echo "Please use another bootstrap compiler"
-        exit 1
-    fi
-
-    # -fllvm is not the default, but set a flag so the Makefile can check
-    # -for it in the build flags later on
-    "${WithGhc}" -fforce-recomp -pgmlc="${BootstrapLlcCmd}" -pgmlo="${BootstrapOptCmd}" -fllvm conftestghc.hs 2>&1 >/dev/null
-    if test $? = 0
-    then
-        res=`./conftestghc`
-        if test "x$res" = "x%object"
-        then
-            AC_MSG_RESULT(yes)
-            GHC_LLVM_AFFECTED_BY_9439=1
-        elif test "x$res" = "x%function"
-        then
-            AC_MSG_RESULT(no)
-            GHC_LLVM_AFFECTED_BY_9439=0
-        else
-            AC_MSG_WARN(unexpected output $res)
-        fi
-    else
-        AC_MSG_RESULT(failed to compile, assuming no)
-    fi
-fi
-AC_SUBST([GHC_LLVM_AFFECTED_BY_9439])
-
 dnl ** Can the unix package be built?
 dnl --------------------------------------------------------------