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Feature/disable backends cmake fix #3709

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c4ca35e
ggml-backend : add disable_backends parameter to skip specific backends
Frank-Schruefer Mar 31, 2026
1b67c53
cmake : avoid duplicate -march=native when already set in CFLAGS
Frank-Schruefer Mar 31, 2026
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1 change: 1 addition & 0 deletions ggml/include/ggml-backend.h
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Original file line number Diff line number Diff line change
Expand Up @@ -245,6 +245,7 @@ extern "C" {
// Load all known backends from dynamic libraries
GGML_API void ggml_backend_load_all(void);
GGML_API void ggml_backend_load_all_from_path(const char * dir_path);
GGML_API void ggml_backend_load_all_from_path_with_disable(const char *dir_path, const char *skiplist);

//
// Backend scheduler
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51 changes: 31 additions & 20 deletions ggml/src/ggml-backend-reg.cpp
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Expand Up @@ -10,6 +10,7 @@
#include <type_traits>
#include <vector>
#include <cctype>
#include <unordered_set>

#ifdef _WIN32
# define WIN32_LEAN_AND_MEAN
Expand Down Expand Up @@ -540,35 +541,45 @@ static ggml_backend_reg_t ggml_backend_load_best(const char * name, bool silent,
return get_reg().load_backend(best_path, silent);
}

void ggml_backend_load_all() {
ggml_backend_load_all_from_path(nullptr);
}
void ggml_backend_load_all() { ggml_backend_load_all_from_path(nullptr); }

void ggml_backend_load_all_from_path(const char *dir_path) { ggml_backend_load_all_from_path_with_disable(dir_path, nullptr); }

void ggml_backend_load_all_from_path(const char * dir_path) {
void ggml_backend_load_all_from_path_with_disable(const char *dir_path, const char *disable_backends) {
#ifdef NDEBUG
bool silent = true;
#else
bool silent = false;
#endif

ggml_backend_load_best("blas", silent, dir_path);
ggml_backend_load_best("zendnn", silent, dir_path);
ggml_backend_load_best("cann", silent, dir_path);
ggml_backend_load_best("cuda", silent, dir_path);
ggml_backend_load_best("hip", silent, dir_path);
ggml_backend_load_best("metal", silent, dir_path);
ggml_backend_load_best("rpc", silent, dir_path);
ggml_backend_load_best("sycl", silent, dir_path);
ggml_backend_load_best("vulkan", silent, dir_path);
ggml_backend_load_best("virtgpu", silent, dir_path);
ggml_backend_load_best("opencl", silent, dir_path);
ggml_backend_load_best("hexagon", silent, dir_path);
ggml_backend_load_best("musa", silent, dir_path);
ggml_backend_load_best("openvino", silent, dir_path);
ggml_backend_load_best("cpu", silent, dir_path);
const std::pair<const char*, const char*> backends[] = {
{"blas", "BLAS"},
{"zendnn", "ZenDNN"},
{"cann", "CANN"},
{"cuda", "CUDA"},
{"hip", "HIP"},
{"metal", "Metal"},
{"rpc", "RPC"},
{"sycl", "SYCL"},
{"vulkan", "Vulkan"},
{"virtgpu", "VirtGPU"},
{"opencl", "OpenCL"},
{"hexagon", "Hexagon"},
{"musa", "MUSA"},
{"openvino","OpenVINO"},
{"cpu", "CPU"} };
std::unordered_set<std::string> skiplist;
if (disable_backends && *disable_backends) {
std::stringstream ss(disable_backends);
std::string token;
while (std::getline(ss, token, ',')) { skiplist.insert(token); } }
for (const auto& [key, name] : backends) {
if(skiplist.find(key) != skiplist.end()) { fprintf(stderr, "INFO: Skipping backend '%s'.\n", name); continue; }
fprintf(stderr, "INFO: Loading backend '%s'.\n", name);
ggml_backend_load_best(key, silent, dir_path); }
// check the environment variable GGML_BACKEND_PATH to load an out-of-tree backend
const char * backend_path = std::getenv("GGML_BACKEND_PATH");
if (backend_path) {
ggml_backend_load(backend_path);
}
}

5 changes: 4 additions & 1 deletion ggml/src/ggml-cpu/CMakeLists.txt
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Expand Up @@ -311,7 +311,10 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
endif()
else ()
if (GGML_NATIVE)
list(APPEND ARCH_FLAGS -march=native)
string(REGEX MATCH "-march=[^ ]+" MARCH_MATCH "${CMAKE_C_FLAGS} ${CMAKE_CXX_FLAGS}")
if(NOT MARCH_MATCH)
list(APPEND ARCH_FLAGS -march=native)
endif()
else ()
if (GGML_SSE42)
list(APPEND ARCH_FLAGS -msse4.2)
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2 changes: 2 additions & 0 deletions include/whisper.h
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Expand Up @@ -117,6 +117,7 @@ extern "C" {
bool use_gpu;
bool flash_attn;
int gpu_device; // CUDA device
char *disable_backends;

// [EXPERIMENTAL] Token-level timestamps with DTW
bool dtw_token_timestamps;
Expand Down Expand Up @@ -734,6 +735,7 @@ extern "C" {
// Get the no_speech probability for the specified segment
WHISPER_API float whisper_full_get_segment_no_speech_prob (struct whisper_context * ctx, int i_segment);
WHISPER_API float whisper_full_get_segment_no_speech_prob_from_state(struct whisper_state * state, int i_segment);

#ifdef __cplusplus
}
#endif
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20 changes: 20 additions & 0 deletions src/whisper.cpp
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Expand Up @@ -32,6 +32,7 @@
#include <set>
#include <string>
#include <thread>
#include <unordered_set>
#include <vector>

#ifdef _MSC_VER
Expand Down Expand Up @@ -212,6 +213,17 @@ static bool ggml_graph_compute_helper(
return t;
}

static void whisper_load_backends(const char *disable_backends) {
#ifdef GGML_BACKEND_DL
static std::once_flag flag;
std::call_once(flag, [disable_backends]() {
ggml_backend_load_all_from_path_with_disable(nullptr, disable_backends);
});
#else
(void)disable_backends;
#endif
}

// TODO: move these functions to ggml-base with support for ggml-backend?

static ggml_tensor * whisper_set_f32(struct ggml_tensor * t, float v) {
Expand Down Expand Up @@ -1290,6 +1302,8 @@ static size_t aheads_masks_nbytes(struct whisper_aheads_masks & aheads_masks) {
static ggml_backend_t whisper_backend_init_gpu(const whisper_context_params & params) {
ggml_log_set(g_state.log_callback, g_state.log_callback_user_data);

whisper_load_backends(params.disable_backends);

ggml_backend_dev_t dev = nullptr;

int cnt = 0;
Expand Down Expand Up @@ -3608,6 +3622,7 @@ struct whisper_context_params whisper_context_default_params() {
/*.use_gpu =*/ true,
/*.flash_attn =*/ true,
/*.gpu_device =*/ 0,
/*.disable_backends =*/ NULL,

/*.dtw_token_timestamps =*/ false,
/*.dtw_aheads_preset =*/ WHISPER_AHEADS_NONE,
Expand Down Expand Up @@ -4315,6 +4330,8 @@ static int whisper_has_openvino(void) {
const char * whisper_print_system_info(void) {
static std::string s;

whisper_load_backends(nullptr);

s = "";
s += "WHISPER : ";
s += "COREML = " + std::to_string(whisper_has_coreml()) + " | ";
Expand Down Expand Up @@ -8214,6 +8231,8 @@ WHISPER_API int whisper_bench_ggml_mul_mat(int n_threads) {
}

WHISPER_API const char * whisper_bench_ggml_mul_mat_str(int n_threads) {
whisper_load_backends(nullptr);

static std::string s;
s = "";
char strbuf[256];
Expand Down Expand Up @@ -8992,3 +9011,4 @@ static void whisper_log_callback_default(ggml_log_level level, const char * text
fputs(text, stderr);
fflush(stderr);
}