Add in a configurator script. Now people can put stuff like this:

$(UCLIBC_DIR)/extra/Configs/uClibc_config_fix.pl --arch=$(ARCH) --cross="$(CROSS)" \
	--devel_prefix=$(STAGING_DIR) --kernel_dir=$(KERNEL_DIR) --large_file=false \
	--rpc_support=true --c99_math=true --shared_support=true --ldso_path="/lib" \
	--shadow=true --file=$(UCLIBC_DIR)/extra/Configs/Config.$(ARCH) > $(UCLIBC_DIR)/Config;

into their makefiles and automagically get the right things happening...
 -Erik

extra/Configs/uClibc_config_fix.pl

@@ -0,0 +1,168 @@
+#!/usr/bin/perl
+# Silly script to fixup the uClibc config file
+# (c) Erik Andersen <andersee@codepoet.org>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+
+use strict;
+use Getopt::Long;
+
+# User Specified variables (commandline)
+my($arch)	    = "";
+my($cross)	    = "";
+my($xcc)	    = "";
+my($native_cc)	    = "";
+my($devel_prefix)   = "/usr/$arch-linux-uclibc";
+my($kernel_dir)	    = "/usr/src/linux";
+my($ldso_path)	    = "$devel_prefix/lib";
+my($mmu)	    = "true";
+my($large_file)	    = "false";
+my($rpc_support)    = "false";
+my($c99_math)	    = "false";
+my($shared_support) = "true";
+my($shadow)	    = "false";
+my($pic)	    = "true";
+my($filename)	    = "";
+my($line);
+my($got_arch);
+
+# Get commandline parameters
+Getopt::Long::Configure("no_ignore_case", "bundling");
+&GetOptions(	"arch=s" => \$arch,
+		"cross=s" => \$cross,
+		"cc=s" => \$xcc,
+		"native_cc=s" => \$native_cc,
+		"devel_prefix=s" => \$devel_prefix,
+		"kernel_dir=s" => \$kernel_dir,
+		"mmu=s" => \$mmu,
+		"large_file=s" => \$large_file,
+		"rpc_support=s" => \$rpc_support,
+		"c99_math=s" => \$c99_math,
+		"shadow=s" => \$shadow,
+		"shared_support=s" => \$shared_support,
+		"ldso_path=s" => \$ldso_path,
+		"pic=s" => \$pic,
+		"file=s" => \$filename,
+		);
+chomp($arch);
+chomp($cross);
+chomp($xcc);
+chomp($native_cc);
+chomp($devel_prefix);
+chomp($kernel_dir);
+chomp($mmu);
+chomp($large_file);
+chomp($rpc_support);
+chomp($c99_math);
+chomp($shadow);
+chomp($shared_support);
+chomp($ldso_path);
+chomp($pic);
+chomp($filename);
+
+if ($filename) {
+	open(FILE,"<$filename") or
+		    die "(fatal) Can't open $filename:$!";
+} else {
+    die "(fatal) Please give me a --file argument$!";
+}
+
+
+while($line = <FILE>) {
+    if ($line =~ /^TARGET_ARCH.*/) {
+	print "TARGET_ARCH=\"$arch\"\n";
+	$got_arch=1;
+	next;
+    } 
+    if ($cross && $line =~ /^CROSS.*/) {
+	print "CROSS=\"$cross\"\n";
+	next;
+    }
+    if ($xcc && $line =~ /^CC.*/) {
+	print "CC=\"$xcc\"\n";
+	next;
+    }
+    if ($native_cc && $line =~ /^NATIVE_CC.*/) {
+	print "NATIVE_CC=\"$native_cc\"\n";
+	next;
+    }
+    if ($line =~ /^DEVEL_PREFIX.*/) {
+	print "DEVEL_PREFIX=\"$devel_prefix\"\n";
+	next;
+    }
+    if ($line =~ /^KERNEL_SOURCE.*/) {
+	print "KERNEL_SOURCE=\"$kernel_dir\"\n";
+	next;
+    }
+    if ($line =~ /^HAS_MMU.*/) {
+	print "HAS_MMU=$mmu\n";
+	next;
+    }
+    if ($line =~ /^DOLFS.*/) {
+	print "DOLFS=$large_file\n";
+	next;
+    }
+    if ($line =~ /^INCLUDE_RPC.*/) {
+	print "INCLUDE_RPC=$rpc_support\n";
+	next;
+    }
+    if ($line =~ /^HAS_SHADOW.*/) {
+	print "HAS_SHADOW=$shadow\n";
+	next;
+    }
+    if ($line =~ /^DO_C99_MATH.*/) {
+	print "DO_C99_MATH=$c99_math\n";
+	next;
+    }
+    if ($shared_support == "true") {
+	if ($line =~ /^BUILD_UCLIBC_LDSO.*/) {
+	    print "BUILD_UCLIBC_LDSO=true\n";
+	    next;
+	}
+	if ($line =~ /^HAVE_SHARED.*/) {
+	    print "HAVE_SHARED=true\n";
+	    next;
+	}
+	# Force PIC to be true when HAVE_SHARED is true
+	if ($line =~ /^DOPIC.*/) {
+	    print "DOPIC=true\n";
+	    next;
+	}
+	if ($line =~ /^SHARED_LIB_LOADER_PATH.*/) {
+	    print "SHARED_LIB_LOADER_PATH=\"$ldso_path\"\n";
+	    next;
+	}
+    } else {
+	if ($line =~ /^BUILD_UCLIBC_LDSO.*/) {
+	    print "BUILD_UCLIBC_LDSO=false\n";
+	    next;
+	}
+	if ($line =~ /^HAVE_SHARED.*/) {
+	    print "HAVE_SHARED=false\n";
+	    next;
+	}
+	if ($line =~ /^DOPIC.*/) {
+	    print "DOPIC=false\n";
+	    next;
+	}
+    }
+    print "$line";
+}
+
+if (! $got_arch) {
+    print "TARGET_ARCH=$arch\n";
+}
+