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nvcc: Allow host compiler different to CXX #435

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7 changes: 5 additions & 2 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -35,10 +35,13 @@ HOST_CXXFLAGS := -O2 -fPIC -fdiagnostics-show-option -felide-constructors -fmess
# Compiler flags supported by GCC but not by the LLVM-based compilers (clang, hipcc, icpx, etc.)
LLVM_UNSUPPORTED_CXXFLAGS := --param vect-max-version-for-alias-checks=50 -Werror=format-contains-nul -Wno-non-template-friend -Werror=return-local-addr -Werror=unused-but-set-variable

# In case nvcc uses a different compiler than CXX
CUDA_NVCC_HOST_COMPILER := $(if $(NVCC_CCBIN),$(NVCC_CCBIN),$(CXX))

export CXXFLAGS := -std=c++20 $(HOST_CXXFLAGS) $(USER_CXXFLAGS) -g
export NVCXX_CXXFLAGS := -std=c++20 -O0 -cuda -gpu=managed -stdpar -fpic -gopt $(USER_CXXFLAGS)
export LDFLAGS := -O2 -fPIC -pthread -Wl,-E -lstdc++fs -ldl
export LDFLAGS_NVCC := -ccbin $(CXX) --linker-options '-E' --linker-options '-lstdc++fs'
export LDFLAGS_NVCC := -ccbin $(CUDA_NVCC_HOST_COMPILER) --linker-options '-E' --linker-options '-lstdc++fs'
export LDFLAGS_NVCXX := -cuda -Wl,-E -ldl -gpu=managed -stdpar
export SO_LDFLAGS := -Wl,-z,defs
export SO_LDFLAGS_NVCC := --linker-options '-z,defs'
Expand Down Expand Up @@ -87,7 +90,7 @@ CUDA_DEBUG_FLAGS := --generate-line-info --source-in-ptx
endif
define CUFLAGS_template
$(2)NVCC_FLAGS := $$(foreach ARCH,$(1),-gencode arch=compute_$$(ARCH),code=[sm_$$(ARCH),compute_$$(ARCH)]) -Wno-deprecated-gpu-targets -Xcudafe --diag_suppress=esa_on_defaulted_function_ignored --expt-relaxed-constexpr --expt-extended-lambda $(CUDA_DEBUG_FLAGS) --display-error-number --threads $$(words $(1)) --cudart=shared
$(2)NVCC_COMMON := -std=c++20 -O3 -g $$($(2)NVCC_FLAGS) -ccbin $(CXX) --compiler-options '$(HOST_CXXFLAGS) $(USER_CXXFLAGS)'
$(2)NVCC_COMMON := -std=c++20 -O3 -g $$($(2)NVCC_FLAGS) -ccbin $(CUDA_NVCC_HOST_COMPILER) --compiler-options '$(HOST_CXXFLAGS) $(USER_CXXFLAGS)'
$(2)CUDA_CUFLAGS := -dc $$($(2)NVCC_COMMON) $(USER_CUDAFLAGS)
$(2)CUDA_DLINKFLAGS := -dlink $$($(2)NVCC_COMMON)
endef
Expand Down