cmake + swig + dependicies

时间:2016-09-06 21:54:13

标签: c++ cmake swig

今天我尝试使用" cmake + swig"为我的代码生成绑定。基本上它有效:

set(SWIG_EXECUTABLE "/usr/bin/swig")
find_package(SWIG REQUIRED)
include(${CMAKE_CURRENT_SOURCE_DIR}/UseSWIG.cmake)

set(CMAKE_SWIG_FLAGS -package example)
set(CMAKE_SWIG_OUTDIR "${CMAKE_CURRENT_SOURCE_DIR}/example")
set_source_files_properties(native.i PROPERTIES CPLUSPLUS ON)
SWIG_ADD_MODULE(core Java native.i lib.cpp)
include_directories(${CMAKE_CURRENT_SOURCE_DIR})

有这样的native.i:

%module native
%include "lib.hpp"
%{
#include "lib.hpp"
  %}

但是,如果我更改lib.hpp构建系统cmake build,则不要调用swig来重新生成代码。所以我必须touch native.i让它工作,这非常烦人。

我找到-M swig选项来生成依赖项, 有什么想法用它来修复UseSWIG.cmake

UseSWIG.cmake只使用add_custom_command进行生成, 所以我需要某种方式add_custom_command依赖于动态的文件集, 不是静止的?

3 个答案:

答案 0 :(得分:2)

在配置期间,您可以使用-M标志运行swig以生成依赖项。然后,您可以解析该输出并将其作为DEPDENDS传递给add_custom_command。

输出如下:

test_wrap.c: \
  .../swig.swg \
  ... \
  test.i \
  test.h

这可以使用execute_command生成,需要进一步处理:

execute_process(COMMAND swig -M <SWIG_ARGUMENTs> OUTPUT_VARIABLES swig_deps)

# Match all lines except the first one until " \"
string(REGEX MATCHALL "\n  [^ ]+" temp ${swig_deps})
set(swig_deps)
foreach(t ${temp})
    string(STRIP "${t}" t)
    set(swig_deps ${swig_deps} "${t}")
endforeach()

...

add_custom_command(... DEPENDS ${swig_deps})

这使得swig依赖于.i文件中包含的所有标头。如果以添加新依赖关系的方式编辑.i或头文件之一,则需要重新配置,以便cmake了解它。如果您添加CMAKE_CONFIGURE_DEPENDS,则会自动执行此操作。

set_property(DIRECTORY ${CMAKE_SOURCE_DIR} APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${swig_deps} test.i)

答案 1 :(得分:2)

我相信我找到了您的请求的解决方案。

我目前正在使用一个解决方案,其中添加了所有相关的依赖项,以便SWIG重新生成接口,无论何时修改任何解析的标头。

我们的想法是创建一个自定义目标,除了删除生成的接口文件外,还会触摸虚拟文件。我已将下面的解决方案放在一个名为fnm的项目中,并带有包装器swig_fnm

# Method to make swig_fnm.i depend on input headers
execute_process(COMMAND swig -M -python -c++  -I${CMAKE_CURRENT_BINARY_DIR}/.. -I${CMAKE_CURRENT_SOURCE_DIR}/.. swig_fnm.i
  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
  OUTPUT_VARIABLE swig_deps
  INPUT_FILE swig_fnm.i)
# Match all lines except the first one until " \"
string(REGEX MATCHALL "\n  [^ ]+" temp ${swig_deps})

# Valid dependency extensions
set(valid_ext .h .hpp)

# Dependency list
set(swig_deps_actual)
foreach(t ${temp})
  string(STRIP "${t}" t)

  # Add to dependency list
  if (EXISTS "${t}")
    set(filter)
    get_filename_component(filter "${t}" EXT)
    if (";${valid_ext};" MATCHES ";${filter};")
      set(swig_deps_actual ${swig_deps_actual} "${t}")
    endif()
  endif()
endforeach()

# This makes configure run again, but does not regenerate the SWIG interface.
set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${swig_deps_actual})

# All headers except for the single .i file are ignored
swig_add_module(swig_fnm python swig_fnm.i ${swig_fnm_HEADERS} ${swig_deps_actual})

# Removes generated file (if any of the dependent files are changed)
add_custom_command(
  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/swig.stamp
  COMMAND ${CMAKE_COMMAND} -E remove ${swig_generated_file_fullname}
  COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/swig.stamp
  DEPENDS ${swig_deps_actual} # The dependent files
  COMMENT "Removing old SWIG generated file" VERBATIM)

# Custom target for establishing dependency
add_custom_target(
  swigtrick
  DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/swig.stamp)

# Dependency
add_dependencies(_swig_fnm swigtrick)

答案 2 :(得分:1)

确实,查看UseSWIG.cmake的源代码,custom commands构建在.i文件上,并且错过了对other sources的依赖。您可以做的是将extra dependencies添加到自定义命令:

set(SWIG_MODULE_core_EXTRA_DEPS lib.hpp)
SWIG_ADD_MODULE(core Java native.i lib.cpp)

或者,您可以修改UseSWIG.cmake以自动添加依赖项:

macro(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile other_sources)
    # ...
    add_custom_command(
        # ...
        DEPENDS ${SWIG_MODULE_${name}_EXTRA_DEPS} ${other_sources}
        # ...
    )
endmacro()

# ...

foreach(it ${swig_dot_i_sources})
    SWIG_ADD_SOURCE_TO_MODULE(${name} swig_generated_source ${it} ${swig_other_sources})
    set(swig_generated_sources ${swig_generated_sources} "${swig_generated_source}")
endforeach()

这导致我最初的评论:

SWIG_ADD_MODULE(core Java native.i lib.cpp lib.hpp)