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Fix build failure when source is read only

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cmake configure fails when it tries to setup target for llvm_vcsrevision_h
This happens only when source is checked out using repo in a read
only filesystem, because cmake tries to create `.git/logs/HEAD` file.

This patch:
  1. Recovers from failure gracefully.
  2. Ensures that VCSRevision.h is successfully created and updated
     in above scenarios.

Differential Revision: https://reviews.llvm.org/D79400
This commit is contained in:
Pushpinder Singh 2020-05-29 01:22:48 -04:00 committed by Sameer Sahasrabuddhe
parent 9a37a41b33
commit 760d781e95
2 changed files with 17 additions and 4 deletions
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8
cmake/modules/AddLLVM.cmake
View File

@ -2118,7 +2118,13 @@ function(find_first_existing_vc_file path out_var)
get_filename_component(git_dir ${git_output} ABSOLUTE BASE_DIR ${path})
# Some branchless cases (e.g. 'repo') may not yet have .git/logs/HEAD
if (NOT EXISTS "${git_dir}/logs/HEAD")
file(WRITE "${git_dir}/logs/HEAD" "")
execute_process(COMMAND ${CMAKE_COMMAND} -E touch HEAD
WORKING_DIRECTORY "${git_dir}/logs"
RESULT_VARIABLE touch_head_result
ERROR_QUIET)
if (NOT touch_head_result EQUAL 0)
return()
endif()
endif()
set(${out_var} "${git_dir}/logs/HEAD" PARENT_SCOPE)
endif()

13
include/llvm/Support/CMakeLists.txt
View File

@ -5,12 +5,19 @@ set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSRevision.h")
set(generate_vcs_version_script "${LLVM_CMAKE_PATH}/GenerateVersionFromVCS.cmake")
if(llvm_vc AND LLVM_APPEND_VC_REV)
if(LLVM_APPEND_VC_REV)
set(llvm_source_dir ${LLVM_MAIN_SRC_DIR})
# A fake version file and is not expected to exist. It is being used to
# force regeneration of VCSRevision.h for source directory with no write
# permission available.
if (NOT llvm_vc)
set(fake_version_inc "${CMAKE_CURRENT_BINARY_DIR}/__FakeVCSRevision.h")
endif()
endif()
# Create custom target to generate the VC revision include.
add_custom_command(OUTPUT "${version_inc}"
add_custom_command(OUTPUT "${version_inc}" "${fake_version_inc}"
DEPENDS "${llvm_vc}" "${generate_vcs_version_script}"
COMMAND ${CMAKE_COMMAND} "-DNAMES=LLVM"
"-DLLVM_SOURCE_DIR=${llvm_source_dir}"
@ -22,5 +29,5 @@ set_source_files_properties("${version_inc}"
PROPERTIES GENERATED TRUE
HEADER_FILE_ONLY TRUE)
add_custom_target(llvm_vcsrevision_h DEPENDS "${version_inc}")
add_custom_target(llvm_vcsrevision_h ALL DEPENDS "${version_inc}" "${fake_version_inc}")
set_target_properties(llvm_vcsrevision_h PROPERTIES FOLDER "Misc")