merge(3p/glog): Vendor glog from commit 'afe04691'

third_party/glog/cmake/TestPackageConfig.cmake

@@ -0,0 +1,33 @@
+# Create the build directory
+execute_process (
+  COMMAND ${CMAKE_COMMAND} -E make_directory ${TEST_BINARY_DIR}
+  RESULT_VARIABLE _DIRECTORY_CREATED_SUCCEEDED
+)
+
+if (NOT _DIRECTORY_CREATED_SUCCEEDED EQUAL 0)
+  message (FATAL_ERROR "Failed to create build directory")
+endif (NOT _DIRECTORY_CREATED_SUCCEEDED EQUAL 0)
+
+# Capture the PATH environment variable content set during project
+# generation stage. This is required because later during the build stage
+# the PATH is modified again (e.g., for MinGW AppVeyor CI builds) by adding
+# back the directory containing git.exe. Incidently, the Git installation
+# directory also contains sh.exe which causes MinGW Makefile generation to
+# fail.
+set (ENV{PATH} ${PATH})
+
+# Run CMake
+execute_process (
+  COMMAND ${CMAKE_COMMAND} -C ${INITIAL_CACHE}
+    -G ${GENERATOR}
+    -DCMAKE_PREFIX_PATH=${PACKAGE_DIR}
+    -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=ON
+    -DCMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY=ON
+    ${SOURCE_DIR}
+  WORKING_DIRECTORY ${TEST_BINARY_DIR}
+  RESULT_VARIABLE _GENERATE_SUCCEEDED
+)
+
+if (NOT _GENERATE_SUCCEEDED EQUAL 0)
+  message (FATAL_ERROR "Failed to generate project files using CMake")
+endif (NOT _GENERATE_SUCCEEDED EQUAL 0)