Have the AutoRegen.sh script prompt the user for the LLVM src and obj

directories if it can't find them. Then, replace those values into the
configure.ac script and pass them to the LLVM_CONFIG_PROJECT so that the
values become the default for llvm_src and llvm_obj variables. In this way
the user is required to input this exactly once, and the scripts take it
from there.

llvm-svn: 27798

llvm/projects/sample/autoconf/AutoRegen.sh

@@ -7,20 +7,42 @@ test -d autoconf && test -f autoconf/configure.ac && cd autoconf
 test -f configure.ac || die "Can't find 'autoconf' dir; please cd into it first"
 autoconf --version | egrep '2\.5[0-9]' > /dev/null
 if test $? -ne 0 ; then
-	die "Your autoconf was not detected as being 2.5x"
+  die "Your autoconf was not detected as being 2.5x"
 fi
 cwd=`pwd`
 if test -d ../../../autoconf/m4 ; then
   cd ../../../autoconf/m4
   llvm_m4=`pwd`
+  llvm_src_root=../../..
+  llvm_obj_root=../../..
   cd $cwd
 elif test -d ../../llvm/autoconf/m4 ; then
   cd ../../llvm/autoconf/m4
   llvm_m4=`pwd`
+  llvm_src_root=../..
+  llvm_obj_root=../..
   cd $cwd
 else
-  die "Can't find the LLVM autoconf/m4 directory. The project should be checked out to projects directory"
+  while true ; do
+    echo "LLVM source root not found." 
+    read -p "Enter full path to LLVM source:"
+    if test -d "$REPLY/autoconf/m4" ; then
+      llvm_src_root="$REPLY"
+      llvm_m4="$REPLY/autoconf/m4"
+      read -p "Enter full path to LLVM objects (empty for same as source):"
+      if test -d "$REPLY" ; then
+        llvm_obj_root="$REPLY"
+      else
+        llvm_obj_root="$llvm_src_root"
+      fi
+      break
+    fi
+  done
 fi
+# Patch the LLVM_ROOT in configure.ac, if it needs it
+cp configure.ac configure.bak
+sed -e "s#^LLVM_SRC_ROOT=.*#LLVM_SRC_ROOT=\"$llvm_src_root\"#" \
+    -e "s#^LLVM_OBJ_ROOT=.*#LLVM_OBJ_ROOT=\"$llvm_obj_root\"#" configure.bak > configure.ac
 echo "Regenerating aclocal.m4 with aclocal"
 rm -f aclocal.m4
 aclocal -I $llvm_m4 -I "$llvm_m4/.." || die "aclocal failed"

llvm/projects/sample/autoconf/configure.ac

@@ -3,13 +3,16 @@ dnl * Initialize
 dnl **************************************************************************
 AC_INIT([[[SAMPLE]]],[[[x.xx]]],[bugs@yourdomain])
 
+dnl Identify where LLVM source tree is
+LLVM_SRC_ROOT="../../"
+LLVM_OBJ_ROOT="../../"
 dnl Tell autoconf that the auxilliary files are actually located in
 dnl the LLVM autoconf directory, not here.
-AC_CONFIG_AUX_DIR(../../autoconf)
+AC_CONFIG_AUX_DIR($LLVM_SRC_ROOT/autoconf)
 
 dnl Tell autoconf that this is an LLVM project being configured
 dnl This provides the --with-llvmsrc and --with-llvmobj options
-LLVM_CONFIG_PROJECT
+LLVM_CONFIG_PROJECT($LLVM_SRC_ROOT,$LLVM_OBJ_ROOT)
 
 dnl Verify that the source directory is valid
 AC_CONFIG_SRCDIR(["Makefile.common.in"])