Change CMake googletest download location in docs
Change CMAKE_BINARY_DIR to CMAKE_CURRENT_BINARY_DIR Able to use in a subfolder's CMakeLists.txt
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		@@ -124,8 +124,8 @@ include(ExternalProject)
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ExternalProject_Add(googletest
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					ExternalProject_Add(googletest
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  GIT_REPOSITORY    https://github.com/google/googletest.git
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					  GIT_REPOSITORY    https://github.com/google/googletest.git
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  GIT_TAG           master
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					  GIT_TAG           master
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  SOURCE_DIR        "${CMAKE_BINARY_DIR}/googletest-src"
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					  SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/googletest-src"
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  BINARY_DIR        "${CMAKE_BINARY_DIR}/googletest-build"
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					  BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/googletest-build"
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  CONFIGURE_COMMAND ""
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					  CONFIGURE_COMMAND ""
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  BUILD_COMMAND     ""
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					  BUILD_COMMAND     ""
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  INSTALL_COMMAND   ""
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					  INSTALL_COMMAND   ""
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@@ -140,13 +140,13 @@ Existing build's `CMakeLists.txt`:
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configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
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					configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
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execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
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					execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
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  RESULT_VARIABLE result
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					  RESULT_VARIABLE result
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  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download )
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					  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
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if(result)
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					if(result)
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  message(FATAL_ERROR "CMake step for googletest failed: ${result}")
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					  message(FATAL_ERROR "CMake step for googletest failed: ${result}")
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endif()
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					endif()
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execute_process(COMMAND ${CMAKE_COMMAND} --build .
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					execute_process(COMMAND ${CMAKE_COMMAND} --build .
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  RESULT_VARIABLE result
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					  RESULT_VARIABLE result
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  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download )
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					  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/googletest-download )
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if(result)
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					if(result)
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  message(FATAL_ERROR "Build step for googletest failed: ${result}")
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					  message(FATAL_ERROR "Build step for googletest failed: ${result}")
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endif()
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					endif()
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@@ -157,8 +157,8 @@ set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
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# Add googletest directly to our build. This defines
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					# Add googletest directly to our build. This defines
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# the gtest and gtest_main targets.
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					# the gtest and gtest_main targets.
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add_subdirectory(${CMAKE_BINARY_DIR}/googletest-src
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					add_subdirectory(${CMAKE_CURRENT_BINARY_DIR}/googletest-src
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                 ${CMAKE_BINARY_DIR}/googletest-build
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					                 ${CMAKE_CURRENT_BINARY_DIR}/googletest-build
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                 EXCLUDE_FROM_ALL)
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					                 EXCLUDE_FROM_ALL)
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# The gtest/gtest_main targets carry header search path
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					# The gtest/gtest_main targets carry header search path
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