[Build] Show error message when using ROCm with LTO and different compilers (#35232)
Dāvis committed
Jun 27, 2026 at 05:43 UTC
1a92dfcce4a9433d002631207b5b01e2e95f1077
1 file changed
+10
CMakeLists.txt
+10
@@ -270,6 +270,16 @@ if(VLLM_GPU_LANG STREQUAL "HIP")
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#
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set(CMAKE_${VLLM_GPU_LANG}_FLAGS "${CMAKE_${VLLM_GPU_LANG}_FLAGS} -Wno-unused-result -Wno-unused-value")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-result -Wno-unused-value")
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+
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+ # When using LTO then *.cpp files must be compiled with same compiler as used linker
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+ # So if HIP uses clang linker we also must use it
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+ # Otherwise symbols will be missing from .so
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+ if (CMAKE_CXX_FLAGS MATCHES "\-flto")
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+ if(NOT CMAKE_CXX_COMPILER_ID STREQUAL CMAKE_HIP_COMPILER_ID)
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+ message(FATAL_ERROR "LTO is enabled for ROCm build, but the C++ compiler (${CMAKE_CXX_COMPILER_ID}) and HIP compiler (${CMAKE_HIP_COMPILER_ID}) are different which is not supported. "
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+ "Please ensure they are same by setting CXX=${CMAKE_HIP_COMPILER} environment variable. Or alternatively disable LTO.")
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+ endif()
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+ endif()
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endif()
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#