cmake: add distclean target

There's no way to properly/fully clean a cmake build when it's configured
in-tree because they only really want to support out-of-tree builds.  Add
a custom script to handle this instead.

CMakeLists.txt

@@ -225,6 +225,8 @@ endif (USE_EXT_GD)
 add_subdirectory(tests)
 add_subdirectory(examples)
 
+add_custom_target(distclean ${GD_SOURCE_DIR}/cmake/distclean.sh)
+
 SET(CPACK_PACKAGE_NAME "libgd")
 SET(CPACK_PACKAGE_DESCRIPTION_SUMMARY "libGD, powerful and easy to use graphic library")
 SET(CPACK_PACKAGE_VENDOR "http://www.libgd.org")

Makefile.am

@@ -3,12 +3,4 @@ SUBDIRS = src config tests
 EXTRA_DIST = test docs examples windows VMS cmake netware bootstrap.sh CMakeLists.txt CONTRIBUTORS README.md
 
 clean-local:
-	find . -maxdepth 3 \
-		'(' \
-			-name CMakeCache.txt -o \
-			-name CMakeFiles -o \
-			-name CTestTestfile.cmake -o \
-			-name cmake_install.cmake \
-		')' \
-		-exec rm -rf {} +
-	rm -rf Bin CPackConfig.cmake CPackSourceConfig.cmake
+	$(srcdir)/cmake/distclean.sh --automake

cmake/distclean.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+# CMake doesn't provide the equiv of "distclean" which makes it impossible to
+# properly clean up after it when you build in-tree.  This script emulates it.
+# It assumes it's run in the dir you want to clean.
+
+usage() {
+	cat <<-EOF
+Usage: $0 [--automake]
+
+Clean all the cmake generated output files.
+
+Options:
+  --automake  Do not clean files autotools also creates
+EOF
+	exit ${1:-0}
+}
+
+AUTOMAKE="false"
+while [ $# -ne 0 ]; do
+	case $1 in
+	-h|--help)  usage ;;
+	--automake) AUTOMAKE="true" ;;
+	*) usage 1 ;;
+	esac
+	shift
+done
+
+set -x
+
+find . -maxdepth 3 \
+	'(' \
+		-name CMakeCache.txt -o \
+		-name CMakeFiles -o \
+		-name CTestTestfile.cmake -o \
+		-name cmake_install.cmake \
+	')' \
+	-exec rm -rf {} +
+rm -rf \
+	Bin Testing \
+	CPackConfig.cmake CPackSourceConfig.cmake \
+	DartConfiguration.tcl
+
+if [ "${AUTOMAKE}" = "false" ]; then
+	find . -maxdepth 3 '!' -wholename './windows/*' -a -name Makefile -exec rm -rf {} +
+	rm -f src/config.h
+fi