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[CMAKE] Speedup developer builds when passing LLVM_APPEND_VC_REV = OFF

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Make sure multiple targets don't get rebuilt unnecessarily when LLVM_APPEND_VC_REV = OFF.

Differential Revision: https://reviews.llvm.org/D35377

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309031 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Don Hinton 2017-07-25 21:13:18 +00:00
parent 35647a1478
commit 9ed22432b4
1 changed files with 23 additions and 9 deletions
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32
include/llvm/Support/CMakeLists.txt
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@ -9,7 +9,6 @@ function(find_first_existing_file out_var)
endfunction()
macro(find_first_existing_vc_file out_var path)
if ( LLVM_APPEND_VC_REV )
find_program(git_executable NAMES git git.exe git.cmd)
# Run from a subdirectory to force git to print an absolute path.
execute_process(COMMAND ${git_executable} rev-parse --git-dir
@ -30,7 +29,6 @@ macro(find_first_existing_vc_file out_var path)
"${path}/.svn/entries" # SVN 1.6
)
endif()
endif()
endmacro()
find_first_existing_vc_file(llvm_vc "${LLVM_MAIN_SRC_DIR}")
@ -40,7 +38,20 @@ set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSRevision.h")
set(get_svn_script "${LLVM_CMAKE_PATH}/GenerateVersionFromCVS.cmake")
if(DEFINED llvm_vc)
file(WRITE "${version_inc}.empty" "")
if((DEFINED llvm_vc) AND LLVM_APPEND_VC_REV)
execute_process(COMMAND ${CMAKE_COMMAND} -E compare_files
"${version_inc}.empty" "${version_inc}"
RESULT_VARIABLE files_not_equal
OUTPUT_QUIET
ERROR_QUIET)
# Remove ${version_inc} if it's empty -- toggling LLMV_APPEND_VC_REV
# from OFF to ON.
if(NOT files_not_equal)
file(REMOVE "${version_inc}")
endif()
# Create custom target to generate the VC revision include.
add_custom_command(OUTPUT "${version_inc}"
DEPENDS "${llvm_vc}" "${get_svn_script}"
@ -49,13 +60,16 @@ if(DEFINED llvm_vc)
"-DNAME=LLVM_REVISION"
"-DHEADER_FILE=${version_inc}"
-P "${get_svn_script}")
# Mark the generated header as being generated.
set_source_files_properties("${version_inc}"
PROPERTIES GENERATED TRUE
HEADER_FILE_ONLY TRUE)
else()
file(WRITE "${version_inc}" "")
# Make sure ${version_inc} is an empty file.
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
"${version_inc}.empty" "${version_inc}")
endif()
file(REMOVE "${version_inc}.empty")
# Mark the generated header as being generated.
set_source_files_properties("${version_inc}"
PROPERTIES GENERATED TRUE
HEADER_FILE_ONLY TRUE)
add_custom_target(llvm_vcsrevision_h DEPENDS "${version_inc}")