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llvm-mirror/cmake/modules/AddSphinxTarget.cmake
Michal Gorny f0ba71f375 [cmake] Include project name in Sphinx doctree dir to fix race conditions
Modify add_sphinx_target() to include the project name alongside builder
in Sphinx doctree directory. This aims to avoid crashes due to race
conditions between multiple Sphinx instances running in parallel that
attempt to create or read that directory simultaneously.

This problem has originally been addressed in r283188. However, that
commit presumed that there will be only one target per builder being
run. However, r314863 introduced a second manpage target, reintroducing
the race condition.

Differential Revision: https://reviews.llvm.org/D40656

llvm-svn: 319461
2017-11-30 19:09:22 +00:00

91 lines
3.4 KiB
CMake

# Create sphinx target
if (LLVM_ENABLE_SPHINX)
message(STATUS "Sphinx enabled.")
find_package(Sphinx REQUIRED)
if (LLVM_BUILD_DOCS AND NOT TARGET sphinx)
add_custom_target(sphinx ALL)
endif()
else()
message(STATUS "Sphinx disabled.")
endif()
# Handy function for creating the different Sphinx targets.
#
# ``builder`` should be one of the supported builders used by
# the sphinx-build command.
#
# ``project`` should be the project name
function (add_sphinx_target builder project)
set(SPHINX_BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/${builder}")
set(SPHINX_DOC_TREE_DIR "${CMAKE_CURRENT_BINARY_DIR}/_doctrees-${project}-${builder}")
set(SPHINX_TARGET_NAME docs-${project}-${builder})
if (SPHINX_WARNINGS_AS_ERRORS)
set(SPHINX_WARNINGS_AS_ERRORS_FLAG "-W")
else()
set(SPHINX_WARNINGS_AS_ERRORS_FLAG "")
endif()
add_custom_target(${SPHINX_TARGET_NAME}
COMMAND ${SPHINX_EXECUTABLE}
-b ${builder}
-d "${SPHINX_DOC_TREE_DIR}"
-q # Quiet: no output other than errors and warnings.
${SPHINX_WARNINGS_AS_ERRORS_FLAG} # Treat warnings as errors if requested
"${CMAKE_CURRENT_SOURCE_DIR}" # Source
"${SPHINX_BUILD_DIR}" # Output
COMMENT
"Generating ${builder} Sphinx documentation for ${project} into \"${SPHINX_BUILD_DIR}\"")
# When "clean" target is run, remove the Sphinx build directory
set_property(DIRECTORY APPEND PROPERTY
ADDITIONAL_MAKE_CLEAN_FILES
"${SPHINX_BUILD_DIR}")
# We need to remove ${SPHINX_DOC_TREE_DIR} when make clean is run
# but we should only add this path once
get_property(_CURRENT_MAKE_CLEAN_FILES
DIRECTORY PROPERTY ADDITIONAL_MAKE_CLEAN_FILES)
list(FIND _CURRENT_MAKE_CLEAN_FILES "${SPHINX_DOC_TREE_DIR}" _INDEX)
if (_INDEX EQUAL -1)
set_property(DIRECTORY APPEND PROPERTY
ADDITIONAL_MAKE_CLEAN_FILES
"${SPHINX_DOC_TREE_DIR}")
endif()
if (LLVM_BUILD_DOCS)
add_dependencies(sphinx ${SPHINX_TARGET_NAME})
# Handle installation
if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
if (builder STREQUAL man)
if (CMAKE_INSTALL_MANDIR)
set(INSTALL_MANDIR ${CMAKE_INSTALL_MANDIR}/)
else()
set(INSTALL_MANDIR share/man/)
endif()
# FIXME: We might not ship all the tools that these man pages describe
install(DIRECTORY "${SPHINX_BUILD_DIR}/" # Slash indicates contents of
COMPONENT "${project}-sphinx-man"
DESTINATION ${INSTALL_MANDIR}man1)
elseif (builder STREQUAL html)
string(TOUPPER "${project}" project_upper)
set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
CACHE STRING "HTML documentation install directory for ${project}")
# '/.' indicates: copy the contents of the directory directly into
# the specified destination, without recreating the last component
# of ${SPHINX_BUILD_DIR} implicitly.
install(DIRECTORY "${SPHINX_BUILD_DIR}/."
COMPONENT "${project}-sphinx-html"
DESTINATION "${${project_upper}_INSTALL_SPHINX_HTML_DIR}")
else()
message(WARNING Installation of ${builder} not supported)
endif()
endif()
endif()
endfunction()