Quote all configure-expanded paths

- Required when the paths may include whitespace or special characters.

Change-Id: I573b4cabf5681bcbe7a545afe4acf9e9f61433e8

cmake/CeresConfig.cmake.in

diff --git a/cmake/CeresConfig.cmake.in b/cmake/CeresConfig.cmake.in
index 0ef7021..104e32d 100644
--- a/cmake/CeresConfig.cmake.in
+++ b/cmake/CeresConfig.cmake.in
@@ -127,7 +127,7 @@
   # install directory for this this file.  This allows for the install
   # tree to be relocated, after Ceres was built, outside of CMake.
   get_filename_component(CURRENT_ROOT_INSTALL_DIR
-    ${CERES_CURRENT_CONFIG_DIR}/@INSTALL_ROOT_REL_CONFIG_INSTALL_DIR@
+    "${CERES_CURRENT_CONFIG_DIR}/@INSTALL_ROOT_REL_CONFIG_INSTALL_DIR@"
     ABSOLUTE)
   if (NOT EXISTS ${CURRENT_ROOT_INSTALL_DIR})
     ceres_report_not_found(
@@ -142,7 +142,7 @@
   # Ceres was exported from the build tree.
   set(CERES_EXPORTED_BUILD_DIR ${CERES_CURRENT_CONFIG_DIR})
   get_filename_component(CERES_EXPORTED_SOURCE_DIR
-    ${CERES_EXPORTED_BUILD_DIR}/@INSTALL_ROOT_REL_CONFIG_INSTALL_DIR@
+    "${CERES_EXPORTED_BUILD_DIR}/@INSTALL_ROOT_REL_CONFIG_INSTALL_DIR@"
     ABSOLUTE)
   if (NOT EXISTS ${CERES_EXPORTED_SOURCE_DIR})
     ceres_report_not_found(
@@ -170,10 +170,10 @@
 set(EIGEN_WAS_BUILT_WITH_CMAKE @FOUND_INSTALLED_EIGEN_CMAKE_CONFIGURATION@)
 # Append the locations of Eigen when Ceres was built to the search path hints.
 if (EIGEN_WAS_BUILT_WITH_CMAKE)
-  set(Eigen3_DIR @Eigen3_DIR@)
+  set(Eigen3_DIR "@Eigen3_DIR@")
   set(EIGEN_PREFER_EXPORTED_EIGEN_CMAKE_CONFIGURATION TRUE)
 else()
-  list(APPEND EIGEN_INCLUDE_DIR_HINTS @EIGEN_INCLUDE_DIR@)
+  list(APPEND EIGEN_INCLUDE_DIR_HINTS "@EIGEN_INCLUDE_DIR@")
 endif()
 # Search quietly to control the timing of the error message if not found. The
 # search should be for an exact match, but for usability reasons do a soft
@@ -219,11 +219,11 @@
   # Append the locations of glog when Ceres was built to the search path hints.
   set(GLOG_WAS_BUILT_WITH_CMAKE @FOUND_INSTALLED_GLOG_CMAKE_CONFIGURATION@)
   if (GLOG_WAS_BUILT_WITH_CMAKE)
-    set(glog_DIR @glog_DIR@)
+    set(glog_DIR "@glog_DIR@")
     set(GLOG_PREFER_EXPORTED_GLOG_CMAKE_CONFIGURATION TRUE)
   else()
-    list(APPEND GLOG_INCLUDE_DIR_HINTS @GLOG_INCLUDE_DIR@)
-    get_filename_component(CERES_BUILD_GLOG_LIBRARY_DIR @GLOG_LIBRARY@ PATH)
+    list(APPEND GLOG_INCLUDE_DIR_HINTS "@GLOG_INCLUDE_DIR@")
+    get_filename_component(CERES_BUILD_GLOG_LIBRARY_DIR "@GLOG_LIBRARY@" PATH)
     list(APPEND GLOG_LIBRARY_DIR_HINTS ${CERES_BUILD_GLOG_LIBRARY_DIR})
   endif()
   # Search quietly s/t we control the timing of the error message if not found.
@@ -241,11 +241,11 @@
   if (CERES_USES_GFLAGS)
     set(GFLAGS_WAS_BUILT_WITH_CMAKE @FOUND_INSTALLED_GFLAGS_CMAKE_CONFIGURATION@)
     if (GFLAGS_WAS_BUILT_WITH_CMAKE)
-      set(gflags_DIR @gflags_DIR@)
+      set(gflags_DIR "@gflags_DIR@")
       set(GFLAGS_PREFER_EXPORTED_GFLAGS_CMAKE_CONFIGURATION TRUE)
     else()
-      list(APPEND GFLAGS_INCLUDE_DIR_HINTS @GFLAGS_INCLUDE_DIR@)
-      get_filename_component(CERES_BUILD_GFLAGS_LIBRARY_DIR @GFLAGS_LIBRARY@ PATH)
+      list(APPEND GFLAGS_INCLUDE_DIR_HINTS "@GFLAGS_INCLUDE_DIR@")
+      get_filename_component(CERES_BUILD_GFLAGS_LIBRARY_DIR "@GFLAGS_LIBRARY@" PATH)
       list(APPEND GFLAGS_LIBRARY_DIR_HINTS ${CERES_BUILD_GFLAGS_LIBRARY_DIR})
     endif()
     # Search quietly s/t we control the timing of the error message if not found.