80 lines
3.4 KiB
CMake
80 lines
3.4 KiB
CMake
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if(DRACO_CMAKE_UTIL_CMAKE_)
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return()
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endif()
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set(DRACO_CMAKE_UTIL_CMAKE_ 1)
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# Creates dummy source file in $draco_build_dir named $basename.$extension and
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# returns the full path to the dummy source file via the $out_file_path
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# parameter.
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function(create_dummy_source_file basename extension out_file_path)
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set(dummy_source_file "${draco_build_dir}/${basename}.${extension}")
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file(WRITE "${dummy_source_file}.new"
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"// Generated file. DO NOT EDIT!\n"
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"// ${target_name} needs a ${extension} file to force link language, \n"
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"// or to silence a harmless CMake warning: Ignore me.\n"
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"void ${target_name}_dummy_function(void) {}\n")
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# Will replace ${dummy_source_file} only if the file content has changed.
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# This prevents forced Draco rebuilds after CMake runs.
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configure_file("${dummy_source_file}.new" "${dummy_source_file}")
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file(REMOVE "${dummy_source_file}.new")
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set(${out_file_path} ${dummy_source_file} PARENT_SCOPE)
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endfunction()
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# Convenience function for adding a dummy source file to $target_name using
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# $extension as the file extension. Wraps create_dummy_source_file().
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function(add_dummy_source_file_to_target target_name extension)
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create_dummy_source_file("${target_name}" "${extension}" "dummy_source_file")
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target_sources(${target_name} PRIVATE ${dummy_source_file})
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endfunction()
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# Extracts the version number from $version_file and returns it to the user via
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# $version_string_out_var. This is achieved by finding the first instance of the
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# kDracoVersion variable and then removing everything but the string literal
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# assigned to the variable. Quotes and semicolon are stripped from the returned
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# string.
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function(extract_version_string version_file version_string_out_var)
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file(STRINGS "${version_file}" draco_version REGEX "kDracoVersion")
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list(GET draco_version 0 draco_version)
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string(REPLACE "static const char kDracoVersion[] = " "" draco_version
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"${draco_version}")
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string(REPLACE ";" "" draco_version "${draco_version}")
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string(REPLACE "\"" "" draco_version "${draco_version}")
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set("${version_string_out_var}" "${draco_version}" PARENT_SCOPE)
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endfunction()
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# Sets CMake compiler launcher to $launcher_name when $launcher_name is found in
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# $PATH. Warns user about ignoring build flag $launcher_flag when $launcher_name
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# is not found in $PATH.
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function(set_compiler_launcher launcher_flag launcher_name)
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find_program(launcher_path "${launcher_name}")
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if(launcher_path)
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set(CMAKE_C_COMPILER_LAUNCHER "${launcher_path}" PARENT_SCOPE)
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set(CMAKE_CXX_COMPILER_LAUNCHER "${launcher_path}" PARENT_SCOPE)
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message("--- Using ${launcher_name} as compiler launcher.")
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else()
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message(
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WARNING "--- Cannot find ${launcher_name}, ${launcher_flag} ignored.")
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endif()
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endfunction()
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# Terminates CMake execution when $var_name is unset in the environment. Sets
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# CMake variable to the value of the environment variable when the variable is
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# present in the environment.
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macro(require_variable var_name)
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if("$ENV{${var_name}}" STREQUAL "")
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message(FATAL_ERROR "${var_name} must be set in environment.")
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endif()
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set_variable_if_unset(${var_name} "")
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endmacro()
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# Sets $var_name to $default_value if not already set.
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macro(set_variable_if_unset var_name default_value)
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if(NOT "$ENV{${var_name}}" STREQUAL "")
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set(${var_name} $ENV{${var_name}})
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elseif(NOT ${var_name})
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set(${var_name} ${default_value})
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endif()
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endmacro()
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