Question

我正在尝试在同一个CMakeLists.txt文件中编译32位和64位的代码。我认为最简单的方法是使用一个函数。编译中使用的（静态）库也构建在CMakeLists.txt文件中。然而，尽管在不同的目录中构建它们，但CMake抱怨说：

add_library cannot create target "mylib" because another target with
the same name already exists.  The existing target is a static library
created in source directory "/home/chris/proj".

问题代码为：

cmake_minimum_required (VERSION 2.6 FATAL_ERROR)

enable_language(Fortran)
project(myproj)

set(libfolder ${PROJECT_SOURCE_DIR}/lib/)

function(build bit)

  message("Build library")
  set(BUILD_BINARY_DIR ${PROJECT_BINARY_DIR}/rel-${bit})
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${BUILD_BINARY_DIR}/bin)
  add_library(mylib STATIC ${libfolder}/mylib.for)
  set(CMAKE_Fortran_FLAGS "-m${bit}")

endfunction()

build(32)
build(64)

我确定我错过了一些明显的东西，但看不出问题......

Answer 1

正如我在评论中所说，以下是我们如何做到这一点的一个例子。

if( CMAKE_SIZEOF_VOID_P EQUAL 8 )
    MESSAGE( "64 bits compiler detected" )
    SET( EX_PLATFORM 64 )
    SET( EX_PLATFORM_NAME "x64" )
else( CMAKE_SIZEOF_VOID_P EQUAL 8 ) 
    MESSAGE( "32 bits compiler detected" )
    SET( EX_PLATFORM 32 )
    SET( EX_PLATFORM_NAME "x86" )
endif( CMAKE_SIZEOF_VOID_P EQUAL 8 )

... 

IF( EX_PLATFORM EQUAL 64 )
MESSAGE( "Outputting to lib64 and bin64" )

# ---------- Setup output Directories -------------------------
SET (CMAKE_LIBRARY_OUTPUT_DIRECTORY
   ${YourSoftwarePath}/lib64
   CACHE PATH
   "Single Directory for all Libraries"
   )

# --------- Setup the Executable output Directory -------------
SET (CMAKE_RUNTIME_OUTPUT_DIRECTORY
   ${YourSoftwarePath}/bin64
   CACHE PATH
   "Single Directory for all Executables."
   )

# --------- Setup the Executable output Directory -------------
SET (CMAKE_ARCHIVE_OUTPUT_DIRECTORY
   ${YourSoftwarePath}/lib64
   CACHE PATH
   "Single Directory for all static libraries."
   )
ELSE( EX_PLATFORM EQUAL 64 )
# ---------- Setup output Directories -------------------------
SET (CMAKE_LIBRARY_OUTPUT_DIRECTORY
   ${YourSoftwarePath}/lib
   CACHE PATH
   "Single Directory for all Libraries"
   )

# --------- Setup the Executable output Directory -------------
SET (CMAKE_RUNTIME_OUTPUT_DIRECTORY
   ${YourSoftwarePath}/bin
   CACHE PATH
   "Single Directory for all Executables."
   )

# --------- Setup the Executable output Directory -------------
SET (CMAKE_ARCHIVE_OUTPUT_DIRECTORY
   ${YourSoftwarePath}/lib
   CACHE PATH
   "Single Directory for all static libraries."
   )
ENDIF( EX_PLATFORM EQUAL 64 )

...


add_library(YourSoftware SHARED
    ${INCLUDES}
    ${SRC}
)

即使在我们的制作过程中，它也能很好地适用于我们。

它允许top为我们的配置做好准备：32位和64位。之后我们必须在两个平台上构建。

Answer 2

<name>中指定的add_library对应于逻辑目标名称，并且在项目中必须是全局唯一。因此，您定义了两次相同的目标（mylib），这是被禁止的。但是，您可以定义两个不同的目标，并指定目标的输出名称以再次生成相同的库名称：

add_library(mylib${bit} STATIC ${libfolder}/mylib.for)
set_target_properties(mylib${bit} PROPERTIES OUTPUT_NAME mylib)

http://www.cmake.org/cmake/help/v3.0/command/add_library.html http://www.cmake.org/cmake/help/v3.0/command/set_target_properties.html

编译32位和64位

2 个答案: