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Automatically re-amalgamate when source/headers change

This commit is contained in:
John Keiser 2020-04-23 11:53:19 -07:00
parent a3b39dfd1a
commit 6cd418b60a
1 changed files with 50 additions and 12 deletions
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62
singleheader/CMakeLists.txt
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@ -9,18 +9,29 @@ set(SINGLEHEADER_FILES
${CMAKE_CURRENT_BINARY_DIR}/amalgamate_demo.cpp
${CMAKE_CURRENT_BINARY_DIR}/README.md
)
set(SINGLEHEADER_REPO_FILES
${CMAKE_CURRENT_SOURCE_DIR}/simdjson.cpp
${CMAKE_CURRENT_SOURCE_DIR}/simdjson.h
${CMAKE_CURRENT_SOURCE_DIR}/amalgamate_demo.cpp
${CMAKE_CURRENT_SOURCE_DIR}/README.md
)
set_source_files_properties(${SINGLEHEADER_FILES} PROPERTIES GENERATED TRUE)
if (MSVC)
# MSVC doesn't have bash, so we use existing amalgamated files instead of generating them ...
add_custom_command(
OUTPUT ${SINGLEHEADER_FILES}
COMMAND ${CMAKE_COMMAND} -E copy
simdjson.cpp simdjson.h amalgamate_demo.cpp README.md
${CMAKE_CURRENT_BINARY_DIR}
DEPENDS simdjson.cpp simdjson.h amalgamate_demo.cpp README.md
)
else()
# (Do not do this if the source and destination are the same!)
if (NOT (${CMAKE_CURRENT_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_BINARY_DIR}))
add_custom_command(
OUTPUT ${SINGLEHEADER_FILES}
COMMAND ${CMAKE_COMMAND} -E copy
${SINGLEHEADER_REPO_FILES}
${CMAKE_CURRENT_BINARY_DIR}
DEPENDS ${SINGLEHEADER_REPO_FILES}
)
endif()
else(MSVC)
##
# Important! The script amalgamate.sh is not generally executable. It
# assumes that bash is at /bin/bash which may not be true.
@ -32,11 +43,38 @@ else()
AMALGAMATE_INPUT_PATH=${PROJECT_SOURCE_DIR}/include
AMALGAMATE_OUTPUT_PATH=${CMAKE_CURRENT_BINARY_DIR}
bash ${CMAKE_CURRENT_SOURCE_DIR}/amalgamate.sh
DEPENDS amalgamate.sh simdjson-source
#
# This is the best way I could find to make amalgamation trigger whenever source files or
# header files change: since the "simdjson" library has to get rebuilt when that happens, we
# take a dependency on the generated library file (even though we're not using it). Depending
# on simdjson-source doesn't do the trick because DEPENDS here can only depend on an
# *artifact*--it won't scan source and include files the way a concrete library or executable
# will.
#
# It sucks that we have to build the actual library to make it happen, but it's better than\
# nothing!
#
DEPENDS amalgamate.sh simdjson
)
endif()
add_custom_target(amalgamate DEPENDS ${SIINGLEHEADER_FILES})
# This is used by "make amalgamate" to update the original source files. We obviously don't do
# this if source and generated files are in the same place--cmake gets mad!
if (NOT (${CMAKE_CURRENT_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_BINARY_DIR}))
add_custom_command(
# We don't really need want this to trigger other stuff, it's a terminal target.
OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/simdjson.cpp ${CMAKE_CURRENT_SOURCE_DIR}/simdjson.h ${CMAKE_CURRENT_SOURCE_DIR}/amalgamate_demo.cpp ${CMAKE_CURRENT_SOURCE_DIR}/README.md
COMMAND ${CMAKE_COMMAND} -E copy ${SINGLEHEADER_FILES} ${CMAKE_CURRENT_SOURCE_DIR}
DEPENDS ${SINGLEHEADER_FILES}
)
endif()
#
# "make amalgamate" to generate the header files directly and update the original source
#
add_custom_target(amalgamate DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/simdjson.cpp ${CMAKE_CURRENT_SOURCE_DIR}/simdjson.h ${CMAKE_CURRENT_SOURCE_DIR}/amalgamate_demo.cpp ${CMAKE_CURRENT_SOURCE_DIR}/README.md)
endif(MSVC)
#
# Include this if you intend to #include "simdjson.cpp" in your own .cpp files.
@ -56,5 +94,5 @@ add_dependencies(simdjson-singleheader-source amalgamate)
# Test the generated simdjson.cpp/simdjson.h using the generated amalgamate_demo.cpp
#
add_executable(amalgamate_demo $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/amalgamate_demo.cpp>)
target_link_libraries(amalgamate_demo simdjson-singleheader-include-source)
target_link_libraries(amalgamate_demo simdjson-singleheader-include-source simdjson-flags)
add_test(amalgamate_demo amalgamate_demo ${EXAMPLE_JSON} ${EXAMPLE_NDJSON})