我有一个可以在给定机器上平稳运行的c ++项目,现在我正在尝试在具有相同操作系统(Xubuntu 14.04)的另一机器上对其进行编译。
我已经安装了所有依赖项,并且正在使用cmake来构建项目,尽管它会因以下错误而停止:
确定pthreads中是否存在函数pthread_create失败,并显示以下输出:... / usr / bin / ld:找不到-lpthreads
包含编译器标志的cmakelists.txt行如下:
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3 -lpthread -DNDEBUG -DEIGEN_MPL2_ONLY")
set(CMAKE_C_FLAGS_DEBUG "-g -O0 -Wall -lpthread -DEIGEN_MPL2_ONLY")
set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS} -O3 -lpthread -I/usr/include/freetype2 -DNDEBUG -DEIGEN_MPL2_ONLY")
set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -lpthread -I/usr/include/freetype2 -DEIGEN_MPL2_ONLY")
我已经做了一些研究,并且已经尝试了以下方法:
-used -pthread / -threads / -thread / -lpthreads而不是-lpthread,这不能解决问题,并使构建停止而没有找到以下软件包: find_package (Threads)
我将不胜感激,因为我已经不知道下一步该怎么做了。
编辑1
该库应位于:
$ find /lib -name "*pthread*"
/lib/x86_64-linux-gnu/libpthread-2.19.so
/lib/x86_64-linux-gnu/libpthread.so.0
还可以找到pthread_create:
$ nm /lib/x86_64-linux-gnu/libpthread.so.0 | grep "pthread_create"
0000000000008430 t __pthread_create_2_1
00000000000081430 T pthread_create@@GLIBC_2.2.5
我还验证了libpthread-stubs0和libc6-dev都存在。
编辑2
这是FindThreads.cmake文件内容的一部分,位于/usr/share/cmake-2.8/Modules/中:
if(CMAKE_HAVE_SPROC_H AND NOT CMAKE_THREAD_PREFER_PTHREAD)
# We have sproc
set(CMAKE_USE_SPROC_INIT 1)
else()
# Do we have pthreads?
CHECK_INCLUDE_FILES("pthread.h" CMAKE_HAVE_PTHREAD_H)
if(CMAKE_HAVE_PTHREAD_H)
#
# We have pthread.h
# Let's check for the library now.
#
set(CMAKE_HAVE_THREADS_LIBRARY)
if(NOT THREADS_HAVE_PTHREAD_ARG)
# Check if pthread functions are in normal C library
CHECK_SYMBOL_EXISTS(pthread_create pthread.h CMAKE_HAVE_LIBC_CREATE)
if(CMAKE_HAVE_LIBC_CREATE)
set(CMAKE_THREAD_LIBS_INIT "")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(Threads_FOUND TRUE)
endif()
if(NOT CMAKE_HAVE_THREADS_LIBRARY)
# Do we have -lpthreads
CHECK_LIBRARY_EXISTS(pthreads pthread_create "" CMAKE_HAVE_PTHREADS_CREATE)
if(CMAKE_HAVE_PTHREADS_CREATE)
set(CMAKE_THREAD_LIBS_INIT "-lpthreads")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(Threads_FOUND TRUE)
endif()
# Ok, how about -lpthread
CHECK_LIBRARY_EXISTS(pthread pthread_create "" CMAKE_HAVE_PTHREAD_CREATE)
if(CMAKE_HAVE_PTHREAD_CREATE)
set(CMAKE_THREAD_LIBS_INIT "-lpthread")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(Threads_FOUND TRUE)
endif()
if(CMAKE_SYSTEM MATCHES "SunOS.*")
# On sun also check for -lthread
CHECK_LIBRARY_EXISTS(thread thr_create "" CMAKE_HAVE_THR_CREATE)
if(CMAKE_HAVE_THR_CREATE)
set(CMAKE_THREAD_LIBS_INIT "-lthread")
set(CMAKE_HAVE_THREADS_LIBRARY 1)
set(Threads_FOUND TRUE)
endif()
endif()
endif()
endif()
if(NOT CMAKE_HAVE_THREADS_LIBRARY)
# If we did not found -lpthread, -lpthread, or -lthread, look for -pthread
if("THREADS_HAVE_PTHREAD_ARG" MATCHES "^THREADS_HAVE_PTHREAD_ARG")
message(STATUS "Check if compiler accepts -pthread")
try_run(THREADS_PTHREAD_ARG THREADS_HAVE_PTHREAD_ARG
${CMAKE_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckForPthreads.c
CMAKE_FLAGS -DLINK_LIBRARIES:STRING=-pthread
COMPILE_OUTPUT_VARIABLE OUTPUT)
if(THREADS_HAVE_PTHREAD_ARG)
if(THREADS_PTHREAD_ARG STREQUAL "2")
set(Threads_FOUND TRUE)
message(STATUS "Check if compiler accepts -pthread - yes")
else()
message(STATUS "Check if compiler accepts -pthread - no")
file(APPEND
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if compiler accepts -pthread returned ${THREADS_PTHREAD_ARG} instead of 2. The compiler had the following output:\n${OUTPUT}\n\n")
endif()
else()
message(STATUS "Check if compiler accepts -pthread - no")
file(APPEND
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if compiler accepts -pthread failed with the following output:\n${OUTPUT}\n\n")
endif()
endif()
if(THREADS_HAVE_PTHREAD_ARG)
set(Threads_FOUND TRUE)
set(CMAKE_THREAD_LIBS_INIT "-pthread")
endif()
endif()
endif()
endif()
编辑3
使用最小的Cmakelists.txt,如下所示:
cmake_minimum_required (VERSION 2.4)
find_package(Threads)
产生了以下输出:
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found.
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
运行cmake时发生了问题。但是,在这种情况下,cmake并不是问题,该错误是静默的,并且-lpthreads相关的错误/警告是唯一写入cmake错误日志文件的内容,尽管这不会引起任何问题。我已经完成了cmakelists.txt的最低版本,并开始逐行进行测试,直到找到导致它停止的软件包:最终我发现这是一个版本不匹配...
通常,您会寻找最后一条错误消息。但是,在这种情况下,这种(通常有用的)策略会误入歧途。
您正在查看的是CMakeCache.txt
,CMakeOutput.log
或CMakeError.log
。怎么会?当配置阶段中的某些宏或测试失败时,CMake会“有帮助地”将这些文件转储到输出中。不幸的是,这些文件可能长达数千行,并且通常包含许多*** Error: xyz"
用于各种配置检查的“ 条目” 。“ -lpthreads
” 的一个偶然地恰巧是日志中的最后一个...
解决方案:从顶部浏览日志,找到带有配置检查的部分,找到之前的最后一个配置检查,CMake在此处识别故障并转储其日志。您也可以尝试搜索文本“ Configuring incomplete, errors occurred!
”
通常,您会在那里找到非常精确的实际错误消息,或者至少找到了名为last的宏或函数的名称/路径,这使您可以查明实际出了什么问题。
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我来说两句