a. GCC LTO requires specifiying CXXFLAGS in LDFLAGS

b. not my fault your machine doesn't link pthread properly

cmake/static_link_runtime.cmake

@@ -10,7 +10,7 @@ if(SOLARIS)
 endif()
 
 if(NOT CMAKE_CROSSCOMPILING)
-  add_compile_options(-static -flto)
+  add_compile_options(-static -flto ${CMAKE_CXX_FLAGS} ${CRYPTO_FLAGS})
 else()
   add_compile_options(-static)
 endif()
@@ -33,8 +33,8 @@ if(NOT CMAKE_CROSSCOMPILING)
   set(CMAKE_C_ARCHIVE_FINISH "true")
   set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> qcs <TARGET> <LINK_FLAGS> <OBJECTS>")
   set(CMAKE_CXX_ARCHIVE_FINISH "true")
-  link_libraries( -flto -static-libstdc++ -static-libgcc -static -Wl,--whole-archive -lpthread -Wl,--no-whole-archive )
+  link_libraries( -flto -static-libstdc++ -static-libgcc -static ${CMAKE_CXX_FLAGS} ${CRYPTO_FLAGS} )
 else()
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libstdc++ -static-libgcc -static -Wl,--whole-archive -lpthread -Wl,--no-whole-archive" )
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libstdc++ -static-libgcc -static ${CMAKE_CXX_FLAGS} ${CRYPTO_FLAGS}" )
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
 endif()