CMAKE如何编译出静态库

经过一段时间的折腾，我也入坑CMAKE了

Linking CXX shared library libtag.dll
Creating library file: libtag.dll.a
[ 98%] Built target tag
Scanning dependencies of target tag_c
[100%] Building CXX object bindings/c/CMakeFiles/tag_c.dir/tag_c.obj
Linking CXX shared library libtag_c.dll
Creating library file: libtag_c.dll.a
[100%] Built target tag_c

为什么我编译出的库是共享的，静态库需要如何配置？
谢谢！

编译的时候还有这2个警告。

-- Could NOT find ZLIB (missing:  ZLIB_INCLUDE_DIR)
-- WARNING: you are using the obsolete 'PKGCONFIG' macro, use FindPkgConfig
-- PKGCONFIG() indicates that cppunit is not installed (install the package whic
h contains cppunit.pc if you want to support this feature)
-- Looking for __RTTI___ in Crun
-- Looking for __RTTI___ in Crun - not found
CMake Warning (dev) in CMakeLists.txt: