jdoerfert created this revision. jdoerfert added a reviewer: hfinkel. Herald added subscribers: guansong, bollu, yaxunl. Herald added a project: clang.
If we are in C++ mode and include <math.h> (not <cmath>) first, we still need to make sure <cmath> is read first. The problem otherwise is that we haven't seen the declarations of the math.h functions when the system math.h includes our cmath overlay. However, our cmath overlay, or better the underlying overlay, e.g. CUDA, uses the math.h functions. Since we haven't declared them yet we get errors. CUDA avoids this by eagerly declaring all math functions (in the __device__ space) but we cannot do this. Instead we break the dependence by forcing cmath to go first. Repository: rG LLVM Github Monorepo https://reviews.llvm.org/D77774 Files: clang/lib/Headers/openmp_wrappers/math.h clang/test/Headers/Inputs/include/math.h clang/test/Headers/nvptx_device_math_sincos.cpp Index: clang/test/Headers/nvptx_device_math_sincos.cpp =================================================================== --- clang/test/Headers/nvptx_device_math_sincos.cpp +++ clang/test/Headers/nvptx_device_math_sincos.cpp @@ -1,8 +1,13 @@ // REQUIRES: nvptx-registered-target // RUN: %clang_cc1 -internal-isystem %S/Inputs/include -fopenmp -triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm-bc %s -o %t-ppc-host.bc -// RUN: %clang_cc1 -internal-isystem %S/../../lib/Headers/openmp_wrappers -include __clang_openmp_device_functions.h -internal-isystem %S/Inputs/include -fopenmp -triple nvptx64-nvidia-cuda -aux-triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s +// RUN: %clang_cc1 -internal-isystem %S/../../lib/Headers/openmp_wrappers -include __clang_openmp_device_functions.h -internal-isystem %S/Inputs/include -fopenmp -triple nvptx64-nvidia-cuda -aux-triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s +// RUN: %clang_cc1 -internal-isystem %S/../../lib/Headers/openmp_wrappers -DCMATH -include __clang_openmp_device_functions.h -internal-isystem %S/Inputs/include -fopenmp -triple nvptx64-nvidia-cuda -aux-triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s +#ifdef CMATH #include <cmath> +#else +#include <math.h> +#endif // 4 calls to sincos(f), all translated to __nv_sincos calls: Index: clang/test/Headers/Inputs/include/math.h =================================================================== --- clang/test/Headers/Inputs/include/math.h +++ clang/test/Headers/Inputs/include/math.h @@ -197,3 +197,7 @@ * math functions. */ #define HUGE_VAL (__builtin_huge_val()) + +#ifdef __cplusplus +#include <cmath> +#endif Index: clang/lib/Headers/openmp_wrappers/math.h =================================================================== --- clang/lib/Headers/openmp_wrappers/math.h +++ clang/lib/Headers/openmp_wrappers/math.h @@ -7,6 +7,19 @@ *===-----------------------------------------------------------------------=== */ +// If we are in C++ mode and include <math.h> (not <cmath>) first, we still need +// to make sure <cmath> is read first. The problem otherwise is that we haven't +// seen the declarations of the math.h functions when the system math.h includes +// our cmath overlay. However, our cmath overlay, or better the underlying +// overlay, e.g. CUDA, uses the math.h functions. Since we haven't declared them +// yet we get errors. CUDA avoids this by eagerly declaring all math functions +// (in the __device__ space) but we cannot do this. Instead we break the +// dependence by forcing cmath to go first. While our cmath will in turn include +// this file, the cmath guards will prevent recursion. +#ifdef __cplusplus +#include <cmath> +#endif + #ifndef __CLANG_OPENMP_MATH_H__ #define __CLANG_OPENMP_MATH_H__
Index: clang/test/Headers/nvptx_device_math_sincos.cpp =================================================================== --- clang/test/Headers/nvptx_device_math_sincos.cpp +++ clang/test/Headers/nvptx_device_math_sincos.cpp @@ -1,8 +1,13 @@ // REQUIRES: nvptx-registered-target // RUN: %clang_cc1 -internal-isystem %S/Inputs/include -fopenmp -triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm-bc %s -o %t-ppc-host.bc -// RUN: %clang_cc1 -internal-isystem %S/../../lib/Headers/openmp_wrappers -include __clang_openmp_device_functions.h -internal-isystem %S/Inputs/include -fopenmp -triple nvptx64-nvidia-cuda -aux-triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s +// RUN: %clang_cc1 -internal-isystem %S/../../lib/Headers/openmp_wrappers -include __clang_openmp_device_functions.h -internal-isystem %S/Inputs/include -fopenmp -triple nvptx64-nvidia-cuda -aux-triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s +// RUN: %clang_cc1 -internal-isystem %S/../../lib/Headers/openmp_wrappers -DCMATH -include __clang_openmp_device_functions.h -internal-isystem %S/Inputs/include -fopenmp -triple nvptx64-nvidia-cuda -aux-triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s +#ifdef CMATH #include <cmath> +#else +#include <math.h> +#endif // 4 calls to sincos(f), all translated to __nv_sincos calls: Index: clang/test/Headers/Inputs/include/math.h =================================================================== --- clang/test/Headers/Inputs/include/math.h +++ clang/test/Headers/Inputs/include/math.h @@ -197,3 +197,7 @@ * math functions. */ #define HUGE_VAL (__builtin_huge_val()) + +#ifdef __cplusplus +#include <cmath> +#endif Index: clang/lib/Headers/openmp_wrappers/math.h =================================================================== --- clang/lib/Headers/openmp_wrappers/math.h +++ clang/lib/Headers/openmp_wrappers/math.h @@ -7,6 +7,19 @@ *===-----------------------------------------------------------------------=== */ +// If we are in C++ mode and include <math.h> (not <cmath>) first, we still need +// to make sure <cmath> is read first. The problem otherwise is that we haven't +// seen the declarations of the math.h functions when the system math.h includes +// our cmath overlay. However, our cmath overlay, or better the underlying +// overlay, e.g. CUDA, uses the math.h functions. Since we haven't declared them +// yet we get errors. CUDA avoids this by eagerly declaring all math functions +// (in the __device__ space) but we cannot do this. Instead we break the +// dependence by forcing cmath to go first. While our cmath will in turn include +// this file, the cmath guards will prevent recursion. +#ifdef __cplusplus +#include <cmath> +#endif + #ifndef __CLANG_OPENMP_MATH_H__ #define __CLANG_OPENMP_MATH_H__
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