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clang-tidy: Clarify comment explaining purpose of CLANG_TIDY_SHA1

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Suggested-by: Bill Hoffman <bill.hoffman@kitware.com>
This commit is contained in:
Brad King 2017-11-17 10:47:25 -05:00
parent 6e07850544
commit 08353542e5
1 changed files with 6 additions and 1 deletions
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7
CMakeLists.txt
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@ -251,7 +251,12 @@ if(CMake_RUN_CLANG_TIDY)
endif()
set(CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_COMMAND}")
# provide definitions for targets that require a rebuild once .clang-tidy changes
# Create a preprocessor definition that depends on .clang-tidy content so
# the compile command will change when .clang-tidy changes. This ensures
# that a subsequent build re-runs clang-tidy on all sources even if they
# do not otherwise need to be recompiled. Nothing actually uses this
# definition. We add it to targets on which we run clang-tidy just to
# get the build dependency on the .clang-tidy file.
file(SHA1 ${CMAKE_CURRENT_SOURCE_DIR}/.clang-tidy clang_tidy_sha1)
set(CLANG_TIDY_DEFINITIONS "CLANG_TIDY_SHA1=${clang_tidy_sha1}")
unset(clang_tidy_sha1)