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# FIND_LLVM_PROG()
# --------------------------------
# Find where the llvm tools are. We have a special function to handle when they
# are installed with a version suffix (e.g., llc-7, llc-7.0) and without (e.g.
# llc).
#
# $1 = the variable to set
# $2 = the command to look for
# $3 = the lower bound version of the command to look for
# $4 = the upper bound version of the command to look for.
#
AC_DEFUN([FIND_LLVM_PROG],[
# Test for program with and without version name.
PROG_VERSION_CANDIDATES=$(for llvmVersion in `seq $4 -1 $3`; do echo "$2-$llvmVersion $2-$llvmVersion.0"; done)
AC_CHECK_TOOLS([$1], [$PROG_VERSION_CANDIDATES $2], [])
AS_IF([test x"$$1" != x],[
PROG_VERSION=`$$1 --version | awk '/.*version [[0-9\.]]+/{for(i=1;i<=NF;i++){ if(\$i ~ /^[[0-9\.]]+$/){print \$i}}}'`
AS_IF([test x"$PROG_VERSION" == x],
[AC_MSG_RESULT(no)
$1=""
AC_MSG_NOTICE([We only support llvm $3 to $4 (no version found).])],
[AC_MSG_CHECKING([$$1 version ($PROG_VERSION) is between $3 and $4])
AX_COMPARE_VERSION([$PROG_VERSION], [lt], [$3],
[AC_MSG_RESULT(no)
$1=""
AC_MSG_NOTICE([We only support llvm $3 to $4 (found $PROG_VERSION).])],
[AX_COMPARE_VERSION([$PROG_VERSION], [gt], [$4],
[AC_MSG_RESULT(no)
$1=""
AC_MSG_NOTICE([We only support llvm $3 to $4 (found $PROG_VERSION).])],
[AC_MSG_RESULT(yes)])])])])
])
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