问题描述
我目前正在尝试将 C++ 库与 SWIG 集成,后者是用于各种语言 (UseSWIG) 的包装器生成器。我想集成到 golang 并这样做,我正在使用 cmake 轻松构建它。
当我构建时,我的 cmake 正在工作,它会生成包装文件和 go 文件,以便拥有我的 go 模块。
但是在 MSVC 中,我从生成的文件中得到了一些错误。我还尝试直接调用我的 go 模块(通过 go run ...),但它缺少库,这就是为什么我首先选择用 Cmake 构建它(链接 ext libs 等),例如链接<fmt/format.h>
由 cmake 中的 vcpkg 获取。
CMakeLists:
...
...
# SWIG integration
find_package(SWIG 4.0.2)
if(SWIG_FOUND)
message("Swig integration")
include (UseSWIG)
set(IPATH "go-integration/basic_host")
set (SWIG_FILE "basic_host.i")
set_source_files_properties(${IPATH}/${SWIG_FILE} PROPERTIES CPLUSPLUS ON)
#library for Go
find_program(GO_EXECUTABLE go)
if (GO_EXECUTABLE)
message("Bindings for Go will be generated using ${GO_EXECUTABLE}")
set(SWIG_MODULE_NAME "bhost-go")
set(CMAKE_SWIG_FLAGS -c++ -go -cgo -intgosize 64)
message("CMAKE_SWIG_FLAGS: ${CMAKE_SWIG_FLAGS}")
swig_add_library(${SWIG_MODULE_NAME}
TYPE SHARED
LANGUAGE go
OUTPUT_DIR basic_host
SOURCES ${IPATH}/${SWIG_FILE}
)
target_include_directories(${SWIG_MODULE_NAME} PRIVATE ${HIDAPI_INCLUDE_DIR})
swig_link_libraries(${SWIG_MODULE_NAME} PUBLIC stduuid)
swig_link_libraries(${SWIG_MODULE_NAME} PUBLIC fmt::fmt-header-only)
swig_link_libraries(${SWIG_MODULE_NAME} PUBLIC nlohmann_json nlohmann_json::nlohmann_json)
set_target_properties(${SWIG_MODULE_NAME} PROPERTIES SWIG_USE_TARGET_INCLUDE_DIRECTORIES TRUE)
else()
message("Go executable not found,golang integration not done")
endif()
else()
message("Swig not found,integration not done")
endif()
basic_host.i
%module basic_host
%{
#include <atomic>
#include <map>
#include <memory>
#include <iostream>
#include <fmt/format.h>
#include "../../examples/basic_host/command_line.h"
#include "../../examples/basic_host/command_line.cpp"
%}
%include <std_string.i>
%include "../../examples/basic_host/command_line.h"
basic_host.go
// Removed because useless (see solution)
basic_hostGO_wrap.cxx:
// Removed because useless (see solution)
错误信息:
5>Swig compile go-integration/basic_host/basic_host.i for go
5>basic_hostGO_wrap.cxx
5>...\_build\basic_host\basic_hostGO_wrap.cxx(204,36): error C3646: '__attribute__': unkNown override specifier
5>...\_build\basic_host\basic_hostGO_wrap.cxx(204,50): error C2059: Syntax error: '('
5>...\_build\basic_host\basic_hostGO_wrap.cxx(204,58): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
5>...\_build\basic_host\basic_hostGO_wrap.cxx(212,7): warning C4551: function call missing argument list
5>...\_build\basic_host\basic_hostGO_wrap.cxx(222,5): error C2065: '__packed__': undeclared identifier
5>...\_build\basic_host\basic_hostGO_wrap.cxx(222,22): error C2146: Syntax error: missing ';' before identifier 'a'
5>...\_build\basic_host\basic_hostGO_wrap.cxx(222,22): error C2065: 'a': undeclared identifier
5>...\_build\basic_host\basic_hostGO_wrap.cxx(223,3): error C2065: 'a': undeclared identifier
5>...\_build\basic_host\basic_hostGO_wrap.cxx(224,27): error C2065: 'a': undeclared identifier
5>...\_build\basic_host\basic_hostGO_wrap.cxx(224,43): error C2065: 'a': undeclared identifier
如果您有任何想法,我很高兴听到。
解决方法
找到了避免这些错误的方法,并且 DLL 在 MSVC 中为 SWIG 构建良好:
在 .i 文件的开头添加这些行:
%begin %{
#define __attribute__(x)
%}
%include <windows.i>