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Update CMake-generated dummy sources only when their content changes

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- this prevents unnecessary rebuilds after each CMake run
This commit is contained in:
Robert Buchholz 2020-03-09 13:45:44 +01:00
parent 27a329e939
commit a3c2d121a4
1 changed files with 7 additions and 1 deletions
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8
cmake/util.cmake
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@ -8,11 +8,17 @@ set(DRACO_CMAKE_UTIL_CMAKE_ 1)
# parameter.
function(create_dummy_source_file basename extension out_file_path)
set(dummy_source_file "${draco_build_dir}/${basename}.${extension}")
file(WRITE "${dummy_source_file}"
file(WRITE "${dummy_source_file}.new"
"// Generated file. DO NOT EDIT!\n"
"// ${target_name} needs a ${extension} file to force link language, \n"
"// or to silence a harmless CMake warning: Ignore me.\n"
"void ${target_name}_dummy_function(void) {}\n")
# Will replace ${dummy_source_file} only if the file content has changed.
# This prevents forced Draco rebuilds after CMake runs.
configure_file("${dummy_source_file}.new" "${dummy_source_file}")
file(REMOVE "${dummy_source_file}.new")
set(${out_file_path} ${dummy_source_file} PARENT_SCOPE)
endfunction()