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cmake: llext: avoid always compiling extensions

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In CMake, unless explicitly disabled, the 'add_library()' and
'add_executable()' functions add their result to the ALL target.

This is undesirable for 'add_llext_target()', since it causes the source
files for all defined extensions to be compiled even when the extension
is not otherwise used by the build process.

Add 'EXCLUDE_FROM_ALL' where appropriate so that the object files are
only built when the extension is actually used by the project.

Signed-off-by: Luca Burelli <l.burelli@arduino.cc>
This commit is contained in:
Luca Burelli 2025-01-29 09:59:22 +01:00 • committed by Benjamin Cabé
commit 487f86183a
1 changed files with 2 additions and 2 deletions
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4
cmake/modules/extensions.cmake
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@ -5640,7 +5640,7 @@ function(add_llext_target target_name)
if(CONFIG_LLEXT_TYPE_ELF_OBJECT)
# Create an object library to compile the source file
add_library(${llext_lib_target} OBJECT ${source_files})
add_library(${llext_lib_target} EXCLUDE_FROM_ALL OBJECT ${source_files})
set(llext_lib_output $<TARGET_OBJECTS:${llext_lib_target}>)
elseif(CONFIG_LLEXT_TYPE_ELF_RELOCATABLE)
@ -5668,7 +5668,7 @@ function(add_llext_target target_name)
elseif(CONFIG_LLEXT_TYPE_ELF_SHAREDLIB)
# Create a shared library
add_library(${llext_lib_target} SHARED ${source_files})
add_library(${llext_lib_target} EXCLUDE_FROM_ALL SHARED ${source_files})
set_target_properties(${llext_lib_target} PROPERTIES
LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/llext
)