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Remove ban on using string_cast with CUDA host code

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string_cast.hpp merely detects whether the current compiler is NVCC (originally based on `if defined(__CUDACC__)` in glm/simd/platform.h) and throws an error if it is. This means string_cast.hpp cannot be included in any header which might ever be used in a CUDA project.

Of course, glm::to_string can't be used in device (GPU) code. However, the current approach to stop this is both incorrect and unnecessary. __CUDACC__ will be defined in both host and device code compilation, and glm::to_string can obviously be used in host code. The correct define is __CUDA_ARCH__ (will be defined only if compiling device code). However, there's no problem if glm::to_string is defined (the header is included) while compiling device code, as long as it's not actually used in the device code. So, throwing an error if __CUDA_ARCH__ is defined would still prevent string_cast.hpp from being included in CUDA projects.

There's actually no need for any manual check to see if glm::to_string is being used in device code, because the compiler will already check for that. It returns a std::string, which itself can't be used in device code, so it's unlikely a developer would try. And if they did, there would be errors that both glm::to_string and all the needed std::string constructors, stream operators, etc. are host-only functions.
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lpisha 2020-11-18 11:09:53 -08:00 • committed by GitHub
parent 596577f200
commit 051781e265
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6
glm/gtx/string_cast.hpp
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@ -11,8 +11,6 @@
/// Include <glm/gtx/string_cast.hpp> to use the features of this extension.
///
/// Setup strings for GLM type values
///
/// This extension is not supported with CUDA
#pragma once
@ -32,10 +30,6 @@
# endif
#endif
#if(GLM_COMPILER & GLM_COMPILER_CUDA)
# error "GLM_GTX_string_cast is not supported on CUDA compiler"
#endif
namespace glm
{
/// @addtogroup gtx_string_cast