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cmake: stub the addon object library when it is header-only #165

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Merged
jcelerier merged 1 commit into from
Jul 9, 2026
Merged

cmake: stub the addon object library when it is header-only #165

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22 changes: 21 additions & 1 deletion cmake/AvendishAddon.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -72,7 +72,27 @@ macro(avnd_addon_object)
endif()
else()
if(NOT TARGET ${AA_C_NAME})
add_library(${AA_C_NAME} STATIC ${AA_SOURCES})
# A header-only object (SOURCES lists no translation unit) would produce an
# empty STATIC library: GNU ar tolerates that, but macOS ar and MSVC lib
# reject it ("no archive members specified"). Give it the same generated
# empty stub the base target uses, so header-only addons link everywhere.
set(_avnd_obj_sources ${AA_SOURCES})
set(_avnd_obj_has_tu 0)
foreach(_avnd_src ${AA_SOURCES})
if(_avnd_src MATCHES "\\.(c|C|cc|cpp|cxx|c\\+\\+|m|mm|M)$")
set(_avnd_obj_has_tu 1)
break()
endif()
endforeach()
if(NOT _avnd_obj_has_tu)
set(_avnd_obj_stub "${CMAKE_CURRENT_BINARY_DIR}/${AA_C_NAME}_avnd_obj_stub.cpp")
if(NOT EXISTS "${_avnd_obj_stub}")
file(WRITE "${_avnd_obj_stub}"
"// Avendish standalone addon object (header-only; intentionally empty TU).\n")
endif()
list(APPEND _avnd_obj_sources "${_avnd_obj_stub}")
endif()
add_library(${AA_C_NAME} STATIC ${_avnd_obj_sources})
endif()
if(TARGET ${AA_BASE} AND NOT "${AA_BASE}" STREQUAL "${AA_C_NAME}")
target_link_libraries(${AA_C_NAME} PUBLIC ${AA_BASE})
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