From 79f2d921129284a850f654c6ff80ba6cfdeda16f Mon Sep 17 00:00:00 2001
From: Abir Deol <160072369+apollo-2006@users.noreply.github.com>
Date: Mon, 7 Sep 2026 22:14:42 -0700
Subject: [PATCH] tests : load backends before init when built with
 GGML_BACKEND_DL (#4031)

With GGML_BACKEND_DL=ON no backend is registered until something calls
ggml_backend_load_all(). Every example does; the tests never did, so
whisper_init_* and parakeet_init_* ran with devices = 0 and aborted on
GGML_ASSERT(device) in ggml_backend_dev_backend_reg.

Three tests aborted on such a build - test-whisper-zero-samples,
test-vad and test-parakeet - taking ctest -L gh to 2 of 4.
test-vad-full has the same fault and reaches it only once a real
base.en model is present.

No workflow caught this because none pairs the two: build-clang,
build-gcc and build-sanitize run ctest -L gh but never set
GGML_BACKEND_DL, while release.yml sets it and runs no tests.

ggml_backend_load_all() is already reachable through whisper.h and
parakeet.h via ggml-cpu.h, so no new include is needed.

Resolves: https://github.com/ggml-org/whisper.cpp/issues/4030
---
 tests/test-parakeet.cpp             | 2 ++
 tests/test-vad-full.cpp             | 2 ++
 tests/test-vad.cpp                  | 2 ++
 tests/test-whisper-zero-samples.cpp | 2 ++
 4 files changed, 8 insertions(+)

diff --git a/tests/test-parakeet.cpp b/tests/test-parakeet.cpp
index 58b64835d..26203db7a 100644
--- a/tests/test-parakeet.cpp
+++ b/tests/test-parakeet.cpp
@@ -111,6 +111,8 @@ static int test_valid_model() {
 }
 
 int main(){
+    ggml_backend_load_all();
+
     if(test_valid_model() != 0){
         return 1;
     }
diff --git a/tests/test-vad-full.cpp b/tests/test-vad-full.cpp
index 765ef3654..f033e0580 100644
--- a/tests/test-vad-full.cpp
+++ b/tests/test-vad-full.cpp
@@ -13,6 +13,8 @@
 #include <cassert>
 
 int main() {
+    ggml_backend_load_all();
+
     std::string whisper_model_path = WHISPER_MODEL_PATH;
     std::string vad_model_path     = VAD_MODEL_PATH;
     std::string sample_path        = SAMPLE_PATH;
diff --git a/tests/test-vad.cpp b/tests/test-vad.cpp
index 0003ae3ac..a1f732d74 100644
--- a/tests/test-vad.cpp
+++ b/tests/test-vad.cpp
@@ -48,6 +48,8 @@ struct whisper_vad_segments * test_detect_timestamps(
 }
 
 int main() {
+    ggml_backend_load_all();
+
     std::string vad_model_path = VAD_MODEL_PATH;
     std::string sample_path    = SAMPLE_PATH;
 
diff --git a/tests/test-whisper-zero-samples.cpp b/tests/test-whisper-zero-samples.cpp
index 5357e62fa..908ad843b 100644
--- a/tests/test-whisper-zero-samples.cpp
+++ b/tests/test-whisper-zero-samples.cpp
@@ -8,6 +8,8 @@
 #include <cassert>
 
 int main() {
+    ggml_backend_load_all();
+
     struct whisper_context_params cparams = whisper_context_default_params();
     cparams.use_gpu = false;