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cmake: Add GGML_BACKEND_DIR option #15074

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Merged
merged 2 commits into from
Aug 4, 2025
Merged

cmake: Add GGML_BACKEND_DIR option #15074

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8e56c32
cmake: Add GGML_BACKEND_DIR option
ckastner Aug 4, 2025
2f532b6
Fix phrasing
ckastner Aug 4, 2025
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5 changes: 3 additions & 2 deletions ggml/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -39,8 +39,9 @@ if (WIN32)
set(CMAKE_SHARED_MODULE_PREFIX "")
endif()

option(BUILD_SHARED_LIBS "ggml: build shared libraries" ${BUILD_SHARED_LIBS_DEFAULT})
option(GGML_BACKEND_DL "ggml: build backends as dynamic libraries (requires BUILD_SHARED_LIBS)" OFF)
option(BUILD_SHARED_LIBS "ggml: build shared libraries" ${BUILD_SHARED_LIBS_DEFAULT})
option(GGML_BACKEND_DL "ggml: build backends as dynamic libraries (requires BUILD_SHARED_LIBS)" OFF)
set(GGML_BACKEND_DIR "" CACHE PATH "ggml: directory to load dynamic backends from (requires GGML_BACKEND_DL")

#
# option list
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2 changes: 1 addition & 1 deletion ggml/cmake/ggml-config.cmake.in
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Expand Up @@ -106,7 +106,7 @@ if(NOT TARGET ggml::ggml)

find_library(GGML_LIBRARY ggml
REQUIRED
HINTS ${GGML_LIB_DIR}
HINTS ${GGML_LIB_DIR} ${GGML_BACKEND_DIR}
NO_CMAKE_FIND_ROOT_PATH)

add_library(ggml::ggml UNKNOWN IMPORTED)
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13 changes: 12 additions & 1 deletion ggml/src/CMakeLists.txt
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Expand Up @@ -214,6 +214,13 @@ add_library(ggml
ggml-backend-reg.cpp)
add_library(ggml::ggml ALIAS ggml)

if (GGML_BACKEND_DIR)
if (NOT GGML_BACKEND_DL)
message(FATAL_ERROR "GGML_BACKEND_DIR requires GGML_BACKEND_DL")
endif()
target_compile_definitions(ggml PUBLIC GGML_BACKEND_DIR="${GGML_BACKEND_DIR}")
endif()

target_link_libraries(ggml PUBLIC ggml-base)

if (CMAKE_SYSTEM_NAME MATCHES "Linux")
Expand All @@ -227,7 +234,11 @@ function(ggml_add_backend_library backend)
set_target_properties(${backend} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
target_compile_definitions(${backend} PRIVATE GGML_BACKEND_DL)
add_dependencies(ggml ${backend})
install(TARGETS ${backend} LIBRARY DESTINATION ${CMAKE_INSTALL_BINDIR})
if (GGML_BACKEND_DIR)
install(TARGETS ${backend} LIBRARY DESTINATION ${GGML_BACKEND_DIR})
else()
install(TARGETS ${backend} LIBRARY DESTINATION ${CMAKE_INSTALL_BINDIR})
endif()
else()
add_library(${backend} ${ARGN})
target_link_libraries(ggml PUBLIC ${backend})
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3 changes: 3 additions & 0 deletions ggml/src/ggml-backend-reg.cpp
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Expand Up @@ -498,6 +498,9 @@ static ggml_backend_reg_t ggml_backend_load_best(const char * name, bool silent,

std::vector<fs::path> search_paths;
if (user_search_path == nullptr) {
#ifdef GGML_BACKEND_DIR
search_paths.push_back(fs::u8path(GGML_BACKEND_DIR));
#endif
// default search paths: executable directory, current directory
search_paths.push_back(get_executable_path());
search_paths.push_back(fs::current_path());
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