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cmake: make target_capnp_sources use CURRENT dirs #289

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ryanofsky merged 2 commits into from
Jun 9, 2026
Merged

cmake: make target_capnp_sources use CURRENT dirs #289

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620f297
cmake: make target_capnp_sources use CURRENT dirs
ryanofsky Jun 3, 2026
615a94f
cmake: document ONLY_CAPNP option in target_capnp_sources
ryanofsky Jun 4, 2026
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21 changes: 13 additions & 8 deletions cmake/TargetCapnpSources.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -27,10 +27,8 @@ Arguments:

#include <schema.capnp.h>

The specified include_prefix should be ${CMAKE_SOURCE_DIR} or a
subdirectory of it to include files relative to the project root. It can
be ${CMAKE_CURRENT_SOURCE_DIR} to include files relative to the current
source directory.
Pass ${CMAKE_CURRENT_SOURCE_DIR} or a subdirectory of it to include files
relative to the current source directory (the typical usage).

Additional Unnamed Arguments:

Expand All @@ -43,12 +41,19 @@ Optional Keyword Arguments:
IMPORT_PATHS: Specifies additional directories to search for imported
`.capnp` files.

ONLY_CAPNP: If specified, only the Cap'n Proto serialization files
(`.capnp.h`, `.capnp.c++`) are generated and compiled. The mpgen proxy
files (`.capnp.proxy-client.c++`, `.capnp.proxy-server.c++`,
`.capnp.proxy-types.c++`, etc.) are skipped. Useful when you need
Cap'n Proto serialization without the multiprocess RPC proxy
infrastructure.

Example:
# Assuming `my_library` is a target and `lib/` contains `.capnp` schema
# files with imports from `include/`.
target_capnp_sources(my_library "${CMAKE_SOURCE_DIR}"
target_capnp_sources(my_library "${CMAKE_CURRENT_SOURCE_DIR}"
lib/schema1.capnp lib/schema2.capnp
IMPORT_PATHS ${CMAKE_SOURCE_DIR}/include)
IMPORT_PATHS ${CMAKE_CURRENT_SOURCE_DIR}/include)

#]=]

Expand Down Expand Up @@ -98,8 +103,8 @@ function(target_capnp_sources target include_prefix)

# Translate include_prefix from a source path to a binary path and add it as a
# target include directory.
set(build_include_prefix ${CMAKE_BINARY_DIR})
file(RELATIVE_PATH relative_path ${CMAKE_SOURCE_DIR} ${include_prefix})
set(build_include_prefix ${CMAKE_CURRENT_BINARY_DIR})
file(RELATIVE_PATH relative_path ${CMAKE_CURRENT_SOURCE_DIR} ${include_prefix})
if(relative_path)
string(APPEND build_include_prefix "/" "${relative_path}")
endif()
Expand Down
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