c – cmake：我必须以哪种顺序指定TARGET_LINK_LIBRARIES

我一次又一次地遇到链接器问题,因为必须以正确的顺序指定TARGET_LINK_LIBRARIES中的所有库.但是我如何确定这个订单呢？例：

我有以下库

libA depends on boost
libB depends on POSTGResql and libA (and therefore on boost)
myTarget uses libA,libB and boost directly (and through libB depends on POSTGResql)

由于所有必需的库只在创建可执行文件时被链接,因此在链接myTarget(最终可执行文件)时必须指定所有库：

TARGET_LINK_LIBRARIES(${ApplicationNamE}  

libboost_program_options.a 
libboost_system.a 
libboost_filesystem.a 
libboost_date_time.a 
libboost_regex.a 

# Should include all boost libraries but strangely some libs (the ones abovE)
# need to be specified "by hand"???
${Boost_LIBRARIES} 

# POSTGResql stuff
libpq.a
libsoci_core.a
libsoci_POSTGResql.a
libpq.so

# My libs
libB.a
libA.a

${CR_168_11845@AKE_THREAD_LIBS_INIT} # pthreads,needed by boost
${CR_168_11845@AKE_DL_LIBS} # For libdl.so etc.
)

由于我链接boost static我的CMakeLists.txt也包含

SET(Boost_USE_STATIC_LIBS ON)

但是,我仍然会遇到链接错误,例如“对boost :: re_detail :: perl_matcher或boost :: date_time :: month_formatter的未定义引用”

这真的很烦人,我正在改变lib排序和一些未定义的引用消失但出现了新的未定义引用.

如何识别正确的订购？！

编辑：

我通过分别识别libs之间的所有依赖关系并适当地排序它们来解决上面的问题(因此添加了libboost_log.a)：

TARGET_LINK_LIBRARIES(${ApplicationNamE}  
libB.a
libA.a

# POSTGResql stuff
libpq.a
libsoci_core.a
libsoci_POSTGResql.a
libpq.so

# Boost
libboost_program_options.a 
libboost_system.a 
libboost_log.a 
libboost_filesystem.a 
libboost_date_time.a 
libboost_regex.a 
# Should include all boost libraries but strangely some libs (the ones abovE)
# need to be specified "by hand"???
${Boost_LIBRARIES} 

# Lowlevel needed by boost
${CR_168_11845@AKE_THREAD_LIBS_INIT} # pthreads,needed by boost
${CR_168_11845@AKE_DL_LIBS} # For libdl.so etc.
)

所以订购自上而下. Top是可执行文件,后跟直接使用的库.接下来是进一步的依赖关系,最后必须添加低级依赖关系(由boost使用).

find_package(Boost COMPONENTS date_time filesystem system ...)
find_package(POSTGResql required)
IF(Boost_FOUND AND POSTGResql_FOUND)
  INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS})
  INCLUDE_DIRECTORIES(${POSTGResql_INCLUDE_DIRS})

  # ApplicationName -> your_application
  # LIB_A_TARGET -> libA
  # LIB_B_TARGET -> libB

  SET(LIB_A_all_DEPS ${Boost_LIBRARIES})
  SET(LIB_B_all_DEPS ${LIB_A_all_DEPS} ${POSTGResql_LIBRARIES})

  SET(EXTRA_APP_DEPS  ) # here all your extra libs that they aren't in boost or Postgre

  SET(YOUR_APP_all_DEPS ${LIB_A_all_DEPS} ${LIB_B_all_DEPS} ${EXTRA_APP_DEPS})

  # Here'll be all your ADD_EXECUTABLE,ADD_LIBRARY code

  TARGET_LINK_LIBRARIES(${LIB_A_TARGET} ${LIB_A_all_DEPS})
  ADD_DEPENDENCIES(${LIB_A_TARGET} ${LIB_A_all_DEPS})

  TARGET_LINK_LIBRARIES(${LIB_B_TARGET} ${LIB_B_all_DEPS})
  ADD_DEPENDENCIES(${LIB_B_TARGET} ${LIB_B_all_DEPS})

  TARGET_LINK_LIBRARIES(${ApplicationNamE} ${YOUR_APP_all_DEPS})
  ADD_DEPENDENCIES(${ApplicationNamE} ${YOUR_APP_all_DEPS})
ENDIF()