From 79fa62c4c2c7f6c8fa3d0dc95ef4b7df29d1c8de Mon Sep 17 00:00:00 2001
From: David Rohr <drohr@jwdt.org>
Date: Thu, 15 Oct 2026 17:07:54 +0200
Subject: [PATCH] GPU CMake: catch error if GPU parameter generation failed.

---
 GPU/GPUTracking/CMakeLists.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/GPU/GPUTracking/CMakeLists.txt b/GPU/GPUTracking/CMakeLists.txt
index f1541e17b467f..6f2e643fc98f6 100644
--- a/GPU/GPUTracking/CMakeLists.txt
+++ b/GPU/GPUTracking/CMakeLists.txt
@@ -476,9 +476,11 @@ elseif(CUDA_ENABLED OR OPENCL_ENABLED OR HIP_ENABLED)
     set(PARAMFILE ${CMAKE_CURRENT_BINARY_DIR}/genGPUArch/gpu_const_param_${GPU_ARCH}.par)
     add_custom_command(
       OUTPUT ${PARAMFILE}
+      COMMAND ${CMAKE_COMMAND} -E rm -f ${PARAMFILE}
       COMMAND bash -c
               "echo -e '#define GPUCA_GPUTYPE_${GPU_ARCH}\\n#define PARAMETER_FILE \"GPUDefParametersDefaults.h\"\\ngInterpreter->AddIncludePath(\"${CMAKE_CURRENT_SOURCE_DIR}/Definitions\");\\ngInterpreter->AddIncludePath(\"${ON_THE_FLY_DIR}\");\\n.x ${CMAKE_CURRENT_SOURCE_DIR}/Standalone/tools/dumpGPUDefParam.C(\"${PARAMFILE}\")\\n.q\\n'"
               | root -l -b > /dev/null
+      COMMAND test -f ${PARAMFILE} # root returns 0 also if the macro fails
       VERBATIM
       WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/genGPUArch
       MAIN_DEPENDENCY Standalone/tools/dumpGPUDefParam.C