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ggml-backend : add root cause in error message if loading backend library fails (#16172)

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This PR adds additional information to an error message when loading backend library via ld_load_library() fails. This helps spotting why backend library did not load (missing library, missing dependency or unresolved symbol etc.).
This commit is contained in:
Rafal Lewczuk
2025-09-29 13:17:09 +02:00
committed by GitHub
parent adc76347d7
commit 02463ab27b
1 changed files with 11 additions and 2 deletions
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13
ggml/src/ggml-backend-reg.cpp
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@@ -135,6 +135,10 @@ static void * dl_get_sym(dl_handle * handle, const char * name) {
return p; return p;
} }
static const char * dl_error() {
return "";
}
#else #else
using dl_handle = void; using dl_handle = void;
@@ -155,6 +159,11 @@ static void * dl_get_sym(dl_handle * handle, const char * name) {
return dlsym(handle, name); return dlsym(handle, name);
} }
static const char * dl_error() {
const char *rslt = dlerror();
return rslt != nullptr ? rslt : "";
}
#endif #endif
using dl_handle_ptr = std::unique_ptr<dl_handle, dl_handle_deleter>; using dl_handle_ptr = std::unique_ptr<dl_handle, dl_handle_deleter>;
@@ -240,7 +249,7 @@ struct ggml_backend_registry {
dl_handle_ptr handle { dl_load_library(path) }; dl_handle_ptr handle { dl_load_library(path) };
if (!handle) { if (!handle) {
if (!silent) { if (!silent) {
GGML_LOG_ERROR("%s: failed to load %s\n", __func__, path_str(path).c_str()); GGML_LOG_ERROR("%s: failed to load %s: %s\n", __func__, path_str(path).c_str(), dl_error());
} }
return nullptr; return nullptr;
} }
@@ -530,7 +539,7 @@ static ggml_backend_reg_t ggml_backend_load_best(const char * name, bool silent,
if (filename.native().find(file_prefix) == 0 && ext == file_extension) { if (filename.native().find(file_prefix) == 0 && ext == file_extension) {
dl_handle_ptr handle { dl_load_library(entry) }; dl_handle_ptr handle { dl_load_library(entry) };
if (!handle && !silent) { if (!handle && !silent) {
GGML_LOG_ERROR("%s: failed to load %s\n", __func__, path_str(entry.path()).c_str()); GGML_LOG_ERROR("%s: failed to load %s: %s\n", __func__, path_str(entry.path()).c_str(), dl_error());
} }
if (handle) { if (handle) {
auto score_fn = (ggml_backend_score_t) dl_get_sym(handle.get(), "ggml_backend_score"); auto score_fn = (ggml_backend_score_t) dl_get_sym(handle.get(), "ggml_backend_score");