b9780

vulkan: fail the build when a shader fails to compile (#24450)

• vulkan-shaders-gen: fail the build when a shader fails to compile

vulkan-shaders-gen did not detect shader-compile subprocess failures, so a
broken libggml-vulkan could be produced while the build reported success and
the breakage only surfaced at run time. execute_command() discarded the child
exit code (POSIX waitpid passed nullptr for status; the Windows branch never
called GetExitCodeProcess) and string_to_spv decided success only from whether
stderr was empty, so a non-zero exit with empty stderr, or a subprocess that
failed to launch, was treated as success.

Return the child exit code from execute_command() (WEXITSTATUS on POSIX,
GetExitCodeProcess on Windows), treat a non-zero exit or non-empty stderr or a
launch exception as a failure, and record it in an atomic flag. main() checks
the flag after process_shaders() and returns EXIT_FAILURE before writing the
output files, so the build stops instead of emitting a broken backend.

Fixes #24393

Signed-off-by: liminfei-amd 91481003+liminfei-amd@users.noreply.github.com

• vulkan-shaders-gen: simplify compile_failed access and drop unreachable return

Address review feedback on #24450:

• Access the std::atomic compile_failed directly (= / implicit bool)
  instead of .store()/.load(); the flag stays atomic because the worker
  threads in process_shaders() set it concurrently.
• Remove the unreachable trailing return -1 in execute_command(): on POSIX the
  child _exit()s after execvp and the parent returns (fork()<0 throws); on
  Windows the block returns the exit code.

Signed-off-by: liminfei-amd 91481003+liminfei-amd@users.noreply.github.com

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Signed-off-by: liminfei-amd 91481003+liminfei-amd@users.noreply.github.com

macOS/iOS:

• macOS Apple Silicon (arm64)
• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
• macOS Intel (x64)
• iOS XCFramework

Linux:

• Ubuntu x64 (CPU)
• Ubuntu arm64 (CPU)
• Ubuntu s390x (CPU)
• Ubuntu x64 (Vulkan)
• Ubuntu arm64 (Vulkan)
• Ubuntu x64 (ROCm 7.2)
• Ubuntu x64 (OpenVINO)
• Ubuntu x64 (SYCL FP32)
• Ubuntu x64 (SYCL FP16)

Android:

• Android arm64 (CPU)

Windows:

• Windows x64 (CPU)
• Windows arm64 (CPU)
• Windows arm64 (OpenCL Adreno)
• Windows x64 (CUDA 12) - CUDA 12.4 DLLs
• Windows x64 (CUDA 13) - CUDA 13.3 DLLs
• Windows x64 (Vulkan)
• Windows x64 (OpenVINO)
• Windows x64 (SYCL)
• Windows x64 (HIP)

openEuler:

• DISABLED
• openEuler x86 (310p)
• openEuler x86 (910b, ACL Graph)
• openEuler aarch64 (310p)
• openEuler aarch64 (910b, ACL Graph)

UI:

• UI