编译32位和64位 [英] Compiling 32 and 64 bit

问题描述

我正在尝试在同一CMakeLists.txt文件中为32位和64位编译一些代码。我认为最简单的方法是使用函数。编译中使用的（静态）库也内置在CMakeLists.txt文件中。但是，尽管将它们构建在不同的目录中，但CMake抱怨：

I'm trying to compile some code for 32 and 64 bit in the same CMakeLists.txt file. I thought the easiest way to do it would be to use a function. The (static) libraries used in the compilation are also built in the CMakeLists.txt file. However, despite building them in different directories, CMake complains that:

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)

我确定我缺少明显的东西，但是看不到问题...

I'm sure I'm missing something obvious, but can't see the problem...

推荐答案

正如我在评论中所说，这是我们如何做到的示例。

As I said in my comment, here is an example of how we did that.

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}
)

即使在生产过程中，它也对我们很好。

It's working well for us, even in our production process.

它允许上面同时为两个做好准备：32和64位。之后，我们必须在两个平台中构建。

It permits top have our configuration ready for both : 32 and 64 bits. After that we have to build in both platform.

这篇关于编译32位和64位的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！