A prelinker is used to compile objective files, which subsequently calls to the consignor and starts checking errors. The generated specialization of the template is also stored in this repository.InstallationInitially, no specialization is inspired.
#REINSTALL VIM MAC OS CODE#
Information on the instantaneous specializations of the template and the part of the reference code on which they depend shall be placed. When the componer detects multiple installation, one of them leaves, the rest is removed.Upon requestUnder this type of installation, repositories shall be created and used in the compilation of all broadcasts. The symbol is defined where it was expected.On question #3.GreedingWith greedy installation, it is assumed that the originator is informed that certain objects may be duplicated in different objective files. Wl,-trace-symbol='ZN12basic_socketI3tcpEC2ES0',-M=app.mapConclusion:tcp_socket.o: definition of ZN12basic_socketI3tcpEC2ES0secure_tcp_socket.o: reference to ZN12basic_socketI3tcpEC2ES0As you can see, although this symbol (according to basic_socket::basic_socket(tcp)) is defined in the symbol tables of both objective files, it is defined in tcp_socket.o.We'll look in the link 12basic_socketI3tcpEC2ES0Ġx0000000000000b68 basic_socket::basic_socket(tcp) part of them is located in the read-only section(s) and each has a zero retreat in the relevant sectionNow let's see the link map and try to make traces for one of the symbols (g++ under macOS says he doesn't know about any -trace-symbol, so I have to cross for linux if anyone knows what it is, please tell me).To generate the link map, we will perform the following team:g++ -o app main.o tcp_socket.o secure_tcp_socket.o Nm -m secure_tcp_.o | grep basic_socketĠ0000000000001cc (_TEXT,_const) weak external _ZTS12basic_socketI3tcpEĪs you can see, each symbol is marked as "weak external." In silence, the symbol in the objective file is strong (strong), and if you had two strong symbols with the same names at the time of the layout, it's a link-time error: for a strong symbol, the componer can accept only one definition, otherwise you'll get a mistake of multiple definition. m For further information on segments, sections and other expanded information on each resin.Result:nm -m tcp_.o | grep basic_socketĠ000000000000040 (_TEXT,_text) weak external automatically hidden _ZN12basic_socketI3tcpEC2ES0Ġ0000000000000f0 (_TEXT,_text) weak external automatically hidden _ZN12basic_socketI3tcpED0EvĠ0000000000000d0 (_TEXT,_text) weak external automatically hidden _ZN12basic_socketI3tcpED1EvĠ000000000000120 (_TEXT,_text) weak external automatically hidden _ZN12basic_socketI3tcpED2EvĠ000000000000170 (_DATA,_const) weak external _ZTI12basic_socketI3tcpEĠ0000000000001c5 (_TEXT,_const) weak external _ZTS12basic_socketI3tcpEĠ000000000000198 (_DATA,_const) weak external automatically hidden _ZTV12basic_socketI3tcpE I'm sorry for the code, but I want all the details to be presented.Compilate and go to the assembly director, where among other things there are two objective files:tcp_.osecure_tcp_socket.oWith nm, we'll see the symbol tables for each objective file. Secure_tcp_socket::secure_tcp_socket(tcp protocol)
secure_tcp_socket:// secure_tcp_socket.hĬlass secure_tcp_socket : public basic_socketĮxplicit secure_tcp_socket(tcp protocol = tcp()) Inline basic_socket::basic_socket(Protocol protocol)Įxplicit tcp_socket(tcp protocol = tcp()) experiment♪Class Shablon:templateĮxplicit basic_socket(Protocol protocol)
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