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build: add option for external mpgen binary #142

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Merged
merged 1 commit into from
Feb 3, 2025
Merged

build: add option for external mpgen binary #142

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2 changes: 2 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@ if(Libmultiprocess_ENABLE_CLANG_TIDY)
set(CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_EXECUTABLE}")
endif()

set(EXTERNAL_MPGEN "" CACHE STRING "Use the supplied mpgen binary rather than the one built internally")
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  1. The value of EXTERNAL_MPGEN must be a full path to satisfy the if(EXIST...) condition. Why not make this more explicit by using the FILEPATH type and mentioning in the help string?

  2. As a user-facing cache variable, it should have a library-specific prefix, like this one:https://github.com/chaincodelabs/libmultiprocess/blob/1e06ff07cdeadc78b2c022750f7b5cbc88d56b1d/CMakeLists.txt#L18

  3. style nit: A full stop at the end of the help string?


include("cmake/compat_config.cmake")
include("cmake/pthread_checks.cmake")
include(GNUInstallDirs)
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14 changes: 11 additions & 3 deletions cmake/TargetCapnpSources.cmake
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Expand Up @@ -60,15 +60,23 @@ function(target_capnp_sources target include_prefix)
"IMPORT_PATHS" # multi_value_keywords
)

if(NOT TARGET Libmultiprocess::mpgen)
message(FATAL_ERROR "Target 'Libmultiprocess::mpgen' does not exist.")
set(MPGEN_BINARY "")
if(EXTERNAL_MPGEN)
set(MPGEN_BINARY "${EXTERNAL_MPGEN}")
if(NOT EXISTS "${MPGEN_BINARY}")
message(FATAL_ERROR "EXTERNAL_MPGEN: \"${MPGEN_BINARY}\" does not exist.")
endif()
elseif(TARGET Libmultiprocess::multiprocess)
set(MPGEN_BINARY $<TARGET_FILE:Libmultiprocess::mpgen>)
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I'm fairly certain that a generation expression isn't necessary here:

Suggested change
set(MPGEN_BINARY $<TARGET_FILE:Libmultiprocess::mpgen>)
set(MPGEN_BINARY Libmultiprocess::mpgen)

else()
message(FATAL_ERROR "No usable mpgen. Set EXTERNAL_MPGEN or enable the internal target.")
endif()

set(generated_headers "")
foreach(capnp_file IN LISTS TCS_UNPARSED_ARGUMENTS)
add_custom_command(
OUTPUT ${capnp_file}.c++ ${capnp_file}.h ${capnp_file}.proxy-client.c++ ${capnp_file}.proxy-types.h ${capnp_file}.proxy-server.c++ ${capnp_file}.proxy-types.c++ ${capnp_file}.proxy.h
COMMAND Libmultiprocess::mpgen ${CMAKE_CURRENT_SOURCE_DIR} ${include_prefix} ${CMAKE_CURRENT_SOURCE_DIR}/${capnp_file} ${TCS_IMPORT_PATHS} ${MP_INCLUDE_DIR}
COMMAND ${MPGEN_BINARY} ${CMAKE_CURRENT_SOURCE_DIR} ${include_prefix} ${CMAKE_CURRENT_SOURCE_DIR}/${capnp_file} ${TCS_IMPORT_PATHS} ${MP_INCLUDE_DIR}
DEPENDS ${capnp_file}
VERBATIM
)
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