链接静态库的未解析符号

Question

我通过静态和动态库的链接获得了一些未定义的引用。

我的目标是获取带有静态链接的poco和uiohook库的可执行文件。 为了指定静态链接，我提供了该库的直接路径，其中一些path/libName.a为path/libName.a 。

以下命令：

/home/lrleon/LLVM-3.7/bin/clang -o collector -g -O2 -fno-strict-aliasing \
collector.o common-vars.o collector-events.o listeners.o \
active_window.o ../lib/libperfq-common.a \
/home/lrleon/aleph-w/libAleph.a /home/lrleon/poco/lib/libPocoNet.a \
/home/lrleon/poco/lib/libPocoFoundation.a /home/lrleon/uiohook/lib/libuiohook.a \
-lstdc++ -lX11 -lcairo -lgsl -lgslcblas -lpthread -lc 

给我以下错误：

/home/lrleon/poco/lib/libPocoFoundation.a(DateTime.o):DateTime.cpp:function Poco::DateTime::dayOfWeek() const: error: undefined reference to 'floor'
/home/lrleon/poco/lib/libPocoFoundation.a(DateTime.o):DateTime.cpp:function Poco::DateTime::toJulianDay(int, int, int, int, int, int, int, int): error: undefined reference to 'floor'
/home/lrleon/poco/lib/libPocoFoundation.a(DateTime.o):DateTime.cpp:function Poco::DateTime::toJulianDay(int, int, int, int, int, int, int, int): error: undefined reference to 'floor'
/home/lrleon/poco/lib/libPocoFoundation.a(DateTime.o):DateTime.cpp:function Poco::DateTime::toJulianDay(int, int, int, int, int, int, int, int): error: undefined reference to 'floor'
/home/lrleon/poco/lib/libPocoFoundation.a(NumericString.o):NumericString.cpp:function double_conversion::PowersOfTenCache::GetCachedPowerForBinaryExponentRange(int, int, double_conversion::DiyFp*, int*): error: undefined reference to 'ceil'
/home/lrleon/poco/lib/libPocoFoundation.a(NumericString.o):NumericString.cpp:function double_conversion::BignumDtoa(double, double_conversion::BignumDtoaMode, int, double_conversion::Vector<char>, int*, int*): error: undefined reference to 'ceil'
/home/lrleon/poco/lib/libPocoFoundation.a(NumericString.o):NumericString.cpp:function Poco::floatToStr(std::string&, float, int, int, char, char): error: undefined reference to 'floorf'
src/x11/input_hook.c:673: error: undefined reference to 'XRecordFreeData'
src/x11/input_hook.c:722: error: undefined reference to 'XRecordQueryVersion'
src/x11/input_hook.c:733: error: undefined reference to 'XRecordAllocRange'
src/x11/input_hook.c:745: error: undefined reference to 'XRecordCreateContext'
src/x11/input_hook.c:792: error: undefined reference to 'XRecordEnableContext'
src/x11/input_hook.c:812: error: undefined reference to 'XRecordFreeContext'
src/x11/input_hook.c:883: error: undefined reference to 'XRecordGetContext'
src/x11/input_hook.c:885: error: undefined reference to 'XRecordDisableContext'
src/x11/system_properties.c:134: error: undefined reference to 'XineramaIsActive'
src/x11/system_properties.c:136: error: undefined reference to 'XineramaQueryScreens'
src/x11/system_properties.c:396: error: undefined reference to 'XtGetMultiClickTime'
src/x11/system_properties.c:480: error: undefined reference to 'XtToolkitInitialize'
src/x11/system_properties.c:481: error: undefined reference to 'XtCreateApplicationContext'
src/x11/system_properties.c:485: error: undefined reference to 'XtOpenDisplay'
src/x11/system_properties.c:502: error: undefined reference to 'XtCloseDisplay'
src/x11/system_properties.c:503: error: undefined reference to 'XtDestroyApplicationContext'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我不明白为什么找不到一些符号。 例如，poco库引用了ceil ， floor ，但是这些符号属于c标准库。 据我了解，这些符号应该是可分解的，因为c库仅在末尾链接。 那是在poco库之后。 与对X11符号的引用类似，我相信它们会被libuiohook引用，并且随后给出链接顺序-lX11

关于我在做什么错的任何想法吗？ 提前致谢

Answer 1

floor和ceil函数在Math库中定义，我看不到使用-lm标志与libm链接