Question

如何让CMake在Windows上静态链接pthread？我使用MSYS2 MinGW 32 bit和cmake v3.7。

我想要实现的是像

这样的编译器调用

g++ -static-libgcc -static-libstdc++ -std=c++11 -o test test.cpp -Wl,-Bstatic -lpthread

设置

target_link_libraries(test PUBLIC "-Wl,-Bstatic -lpthread")

导致-Wl,-Bdynamic -Wl,-Bstatic -lpthread被调用。如果我更改CMAKE_EXE_LINKER_FLAGS，则会在我的目标文件之前包含pthreads，因此符号不会被解析。

Answer 1

正如其源代码中提到的FindThreads.cmake：

# For systems with multiple thread libraries, caller can set
#
# ::
#
#   CMAKE_THREAD_PREFER_PTHREAD
#
# If the use of the -pthread compiler and linker flag is preferred then the
# caller can set
#
# ::
#
#   THREADS_PREFER_PTHREAD_FLAG
#
# Please note that the compiler flag can only be used with the imported
# target. Use of both the imported target as well as this switch is highly
# recommended for new code.

因此，除了已经说过的内容之外，您可能还需要设置附加标志THREADS_PREFER_PTHREAD_FLAG。在某些系统（OSX等）中，编译时需要此标志，因为如果只链接-lpthread，它会定义一些丢失的宏。

set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
set(THREADS_PREFER_PTHREAD_FLAG TRUE)
add_library(test test.cpp)
set_property(TARGET test PROPERTY CXX_STANDARD 11)
set_target_properties(test PROPERTIES LINK_SEARCH_START_STATIC 1)
set_target_properties(test PROPERTIES LINK_SEARCH_END_STATIC 1)
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++")
find_package(Threads REQUIRED)  

target_link_libraries(test Threads::Threads)

有帮助吗？

Answer 2

找到Threads模块：

find_package(Threads REQUIRED)
add_executable(myApp main.cpp)
target_link_libraries(myApp Threads::Threads)

请注意文档：

对于具有多个线程库的系统，调用者可以设置CMAKE_THREAD_PREFER_PTHREAD

用cmake静态链接pthread

2 个答案: