Suggested the same to the upstream: https://github.com/muflihun/easyloggingpp/issues/603

--- CMakeLists.txt.orig	2018-02-14 05:35:11 UTC
+++ CMakeLists.txt
@@ -22,7 +22,7 @@ macro(require_cpp11)
 endmacro()
 
 option(test "Build all tests" OFF)
-option(build_static_lib "Build easyloggingpp as a static library" OFF)
+option(build_shared_lib "Build easyloggingpp as a shared library" OFF)
 option(lib_utc_datetime "Build library with UTC date/time logging" OFF)
 
 set(ELPP_MAJOR_VERSION "9")
@@ -31,7 +31,7 @@ set(ELPP_PATCH_VERSION "0")
 set(ELPP_VERSION_STRING "${ELPP_MAJOR_VERSION}.${ELPP_MINOR_VERSION}.${ELPP_PATCH_VERSION}")
 
 set(ELPP_INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/include" CACHE PATH "The directory the headers are installed in")
-set(ELPP_PKGCONFIG_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/share/pkgconfig" CACHE PATH "Installation directory for pkgconfig (.pc) files")
+set(ELPP_PKGCONFIG_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/libdata/pkgconfig" CACHE PATH "Installation directory for pkgconfig (.pc) files")
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
 
@@ -46,17 +46,17 @@ configure_file( ${CMAKE_CURRENT_SOURCE_D
 
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/easyloggingpp.pc DESTINATION "${ELPP_PKGCONFIG_INSTALL_DIR}")
 
-if (build_static_lib)
+if (build_shared_lib)
         if (lib_utc_datetime)
                 add_definitions(-DELPP_UTC_DATETIME)
         endif()
 
         require_cpp11()
-        add_library(easyloggingpp STATIC src/easylogging++.cc)
+        add_library(easyloggingpp SHARED src/easylogging++.cc)
 
         install(TARGETS
             easyloggingpp
-            ARCHIVE DESTINATION lib)
+            DESTINATION lib)
 endif()
 
 export(PACKAGE ${PROJECT_NAME})
