Commit 146dd138 authored by thomie's avatar thomie Committed by Austin Seipp

Only test for bug #9439 when llvm is installed

Reviewers: bgamari, austin

Reviewed By: austin

Subscribers: thomie, carter

Differential Revision: https://phabricator.haskell.org/D500

GHC Trac Issues: #9807
parent b0477338
......@@ -187,56 +187,6 @@ AC_SUBST([WithGhc])
dnl ** Without optimization some INLINE trickery fails for GHCi
SRC_CC_OPTS="-O"
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.
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
"${WithGhc}" conftestghc.hs 2>&1 >/dev/null
res=`./conftestghc`
if test "x$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 -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 $res)
fi
else
AC_MSG_RESULT(failed to compile, assuming no)
fi
AC_SUBST([GHC_LLVM_AFFECTED_BY_9439])
dnl--------------------------------------------------------------------
dnl * Choose host(/target/build) platform
dnl--------------------------------------------------------------------
......@@ -593,6 +543,59 @@ dnl --------------------------------------------------------------
dnl * General configuration checks
dnl --------------------------------------------------------------
dnl ** Bug 9439: Some GHC 7.8 releases had broken LLVM code generator.
dnl Unfortunately we don't know whether the user is going to request a
dnl build with the LLVM backend as this is only given in build.mk.
dnl
dnl Instead, we try to do as much work as possible here, checking
dnl whether -fllvm is the stage 0 compiler's default. If so we
dnl fail. If not, we check whether -fllvm is affected explicitly and
dnl if so set a flag. The build system will later check this flag
dnl after the desired build flags are known.
if test -n "$LlcCmd" && test -n "$OptCmd"
then
AC_MSG_CHECKING(whether bootstrap compiler is affected by bug 9439)
echo "main = putStrLn \"%function\"" > conftestghc.hs
# Check whether LLVM backend is default for this platform
"${WithGhc}" 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 -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 --------------------------------------------------------------
......
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