Generate drake-config.cmake at build time

Remove the hand-generated drake-config.cmake and replace with a rule to
generate it from drake.cps at build time. Update packaging accordingly.

tools/BUILD

@@ -40,6 +40,15 @@ alias(
     actual = "@com_github_bazelbuild_buildtools//buildifier",
 )
 
+genrule(
+    name = "cmake_exports",
+    srcs = ["drake.cps"],
+    outs = ["drake-config.cmake"],
+    cmd = "$(location @pycps//:cps2cmake_executable) $(location drake.cps) > \"$@\"",
+    tools = ["@pycps//:cps2cmake_executable"],
+    visibility = ["//visibility:private"],
+)
+
 # This pulls the otherwise-unused libbot targets into the "//..." label tree.
 genrule(
     name = "force_libbot",

tools/drake.cps

@@ -3,6 +3,7 @@
   "Meta-Schema": "https://mwoehlke.github.io/cps/",
   "X-Purpose": "Used to generate drake-config.cmake via cps2cmake",
   "X-See-Also": "https://github.com/mwoehlke/pycps",
+  "Cps-Version": "0.8.0",
   "Name": "drake",
   "Website": "http://drake.mit.edu/",
   "Components": {

tools/package_drake.sh

@@ -23,7 +23,6 @@ function canonicalize
 # Copy source artifacts to specified install prefix.
 function copy_source_artifacts
 {
-  cp tools/drake-config.cmake "$1/lib/cmake/drake/"
   cp LICENSE.TXT "$1/"
 }
 
@@ -32,6 +31,7 @@ function copy_source_artifacts
 function copy_build_artifacts
 {
   cp bazel-bin/drake/libdrake.so "$1/lib/"
+  cp bazel-genfiles/tools/drake-config.cmake "$1/lib/cmake/drake/"
 }
 
 #------------------------------------------------------------------------------