OpenCL错误类在C ++主机中产生错误

Question

我正在尝试在C ++ OpenCL主机中捕获错误，并且无法编译。这是程序：

#include "gpu/cldrive/libcldrive.h"

#include "gpu/cldrive/kernel_arg_value.h"
#include "gpu/cldrive/kernel_driver.h"
#include "gpu/clinfo/libclinfo.h"

#include "labm8/cpp/logging.h"
#include "labm8/cpp/status.h"
#include "labm8/cpp/statusor.h"

#include "absl/strings/str_cat.h"
#include "absl/strings/str_format.h"
#include "absl/strings/strip.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"

#define CL_HPP_ENABLE_EXCEPTIONS
#define LOG_CL_ERROR(level, error)                                  \
  LOG(level) << "OpenCL exception: " << error.what() << ", error: " \
             << labm8::gpu::clinfo::OpenClErrorString(error.err());

namespace gpu {
namespace cldrive {

namespace {

// Attempt to build OpenCL program.
labm8::StatusOr<cl::Program> BuildOpenClProgram(
    const std::string& opencl_kernel, const cl::Context& context,
    const string& cl_build_opts) {
  auto start_time = absl::Now();
  try {
    // Assemble the build options. We need -cl-kernel-arg-info so that we can
    // read the kernel signatures.
    string all_build_opts = "-cl-kernel-arg-info ";
    absl::StrAppend(&all_build_opts, cl_build_opts);
    labm8::TrimRight(all_build_opts);

    cl::Program program;
    // SPIR-V Compilation
    if(opencl_kernel.substr( opencl_kernel.length() - 4 ) == ".spv") {
        std::vector<char> cl_kernel(opencl_kernel.begin(), opencl_kernel.end());
        program = cl::Program{context, cl_kernel};

    // OPENCL:    
    } else { 
        program = cl::Program{context, opencl_kernel};
    }

    program.build(context.getInfo<CL_CONTEXT_DEVICES>(),
                  all_build_opts.c_str());
    auto end_time = absl::Now();
    auto duration = (end_time - start_time) / absl::Milliseconds(1);
    LOG(INFO) << "clBuildProgram() with options '" << all_build_opts
              << "' completed in " << duration << " ms";
    return program;
  } catch (cl::Error e) {
    LOG_CL_ERROR(WARNING, e);
    return labm8::Status(labm8::error::Code::INVALID_ARGUMENT,
                         "clBuildProgram failed");
  }
}

}  // namespace

使用bazel构建时，出现以下错误：

ERROR: /home/enrique/Escritorio/cldrive/gpu/cldrive/BUILD:315:1: Couldn't
build file gpu/cldrive/_objs/libcldrive/libcldrive.pic.o: C++
compilation of rule '//gpu/cldrive:libcldrive' failed (Exit 1) gcc
failed: error executing command /usr/bin/gcc -U_FORTIFY_SOURCE
-fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer -g0 -O2 '-D_FORTIFY_SOURCE=1' -DNDEBUG -ffunction-sections ... (remaining 299
argument(s) skipped)

Use --sandbox_debug to see verbose messages from the sandbox In file
included from ./gpu/cldrive/libcldrive.h:21:0,
                 from gpu/cldrive/libcldrive.cc:16: ./third_party/opencl/cl.hpp:438:109: note: #pragma message: cl2.hpp:
CL_HPP_TARGET_OPENCL_VERSION is not defined. It will default to 220
(OpenCL 2.2)  # pragma message("cl2.hpp: CL_HPP_TARGET_OPENCL_VERSION
is not defined. It will default to 220 (OpenCL 2.2)")
                                                                                                             ^ gpu/cldrive/libcldrive.cc: In function 'labm8::StatusOr<cl::Program>
gpu::cldrive::{anonymous}::BuildOpenClProgram(const string&, const
cl::Context&, const string&)': gpu/cldrive/libcldrive.cc:76:16: error:
'Error' in namespace 'cl' does not name a type    } catch (cl::Error
e) {
                ^~~~~ gpu/cldrive/libcldrive.cc:77:27: error: 'e' was not declared in this scope
     LOG_CL_ERROR(WARNING, e);
                           ^ gpu/cldrive/libcldrive.cc:34:41: note: in definition of macro 'LOG_CL_ERROR'    LOG(level) << "OpenCL exception:
" << error.what() << ", error: " \
                                         ^~~~~ gpu/cldrive/libcldrive.cc: In member function 'void
gpu::cldrive::Cldrive::RunOrDie(gpu::cldrive::Logger&)':
gpu/cldrive/libcldrive.cc:93:16: error: 'Error' in namespace 'cl' does
not name a type    } catch (cl::Error error) {
                ^~~~~ gpu/cldrive/libcldrive.cc:95:41: error: 'error' was not declared in this scope
                << "    Raised by:  " << error.what() << '\n'
                                         ^~~~~ gpu/cldrive/libcldrive.cc:95:41: note: suggested alternative: In file
included from ./gpu/cldrive/logger.h:21:0,
                 from ./gpu/cldrive/libcldrive.h:18,
                 from gpu/cldrive/libcldrive.cc:16: ./labm8/cpp/status.h:41:11: note:   'labm8::error'  namespace error {
           ^~~~~

在类头文件（libcldrive.h）中，包含头文件cl2.hpp。此代码与旧的标头一起使用，将旧的cl.hpp更新为cl2.hpp时开始出现错误。我在新的标题中查找该类，并且该类仍然存在，所以我不明白为什么它会给出错误。

提前感谢。

Answer 1

[Hans已经在注释中链接到有关同一问题的另一个问题，但是尽管正确，但我在此找不到特别完整，有用或友好的答案。

本质上，在OpenCL错误上引发异常是C ++包装程序的可选功能。 （至少可以说C ++中的异常是有争议的），因此需要使用CL_HPP_ENABLE_EXCEPTIONS预处理程序宏，之前 #include使用包装程序头显式启用它。

This is documented in the C++ wrapper's documentation here.

文档也提供了一个有用的示例，其中启用了此功能：

#define CL_HPP_ENABLE_EXCEPTIONS
#define CL_HPP_TARGET_OPENCL_VERSION 200
#include <CL/cl2.hpp>

请注意，您的构建也警告您不要定义CL_HPP_TARGET_OPENCL_VERSION-您可能应该这样做以匹配OpenCL标头的版本。