尽管链接到数学库,但未定义对`sqrt`的引用

Question

我正在尝试从英特尔MKL库(/opt/intel/mkl/examples/versionqueryc/)编译示例程序.我将源代码(C文件)复制到一个新目录.然后我去尝试用CMake构建这个例子.

在调试过程中,我在尝试使用以下命令时遇到困难(现在与cmake隔离).

它没有找到数学库,但我已经-lm包含在链接中.那么发生了什么？

:~/devel/mkl/MKL Test/build$  /usr/bin/gcc -m64 CMakeFiles/mkltest.dir/main.c.o \
>     -o mkltest    -rdynamic -L/home/myuser/src/intel/mkl/lib/intel64 \
>     -lm  -lmkl_intel_lp64 -lmkl_sequential -lmkl_core  -lmkl_cdft_core \
>     -lmkl_scalapack_lp64 \
>     /home/myuser/src/intel/lib/intel64/libiomp5.so \
>     -Wl,-rpath,/home/myuser/src/intel/mkl/lib/intel64:/home/myuser/src/intel/lib/intel64 
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `logf'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `atan2'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `sin'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `fabs'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `exp'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `sqrtf'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `cos'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `sqrt'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_sequential.so: undefined reference to `log'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `pow'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `log10'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `ceil'
/home/myuser/src/intel/mkl/lib/intel64/libmkl_core.so: undefined reference to `expf'
collect2: ld returned 1 exit status

Answer 1

将-lm作为最后一个参数,参数的顺序是同时连接很重要.