Add a gross "--use-current-dir-as-prefix" option as a temporary workaround
for the "build with one prefix and move the installed files to another dir"
problem.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28654 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-config/llvm-config.in.in b/tools/llvm-config/llvm-config.in.in
index 2f1e214..b0c74df 100644
--- a/tools/llvm-config/llvm-config.in.in
+++ b/tools/llvm-config/llvm-config.in.in
@@ -27,6 +27,9 @@
 my $LDFLAGS             = q{@LLVM_LDFLAGS@};
 #---- end Makefile values ----
 
+# Convert the current executable name into its directory (e.g. ".").
+my ($PARTIALDIR) = ($0 =~ /^(.*)\/.*$/);
+
 sub usage;
 sub fix_library_names (@);
 sub expand_dependecies (@);
@@ -43,6 +46,11 @@
     if ($arg =~ /^-/) {
         if ($arg eq "--version") {
             $has_opt = 1; print "$VERSION\n";
+        } elsif ($arg eq "--use-current-dir-as-prefix") {
+            # Convert the scripts executable dir into a full absolute directory.
+            my $ABSDIR = `cd $PARTIALDIR/..; pwd`;
+            chomp($ABSDIR);
+            $PREFIX = $ABSDIR;
         } elsif ($arg eq "--prefix") {
             $has_opt = 1; print "$PREFIX\n";
         } elsif ($arg eq "--bindir") {