How to include static library in makefile

Question

I have the following makefile  CXXFILES   pthreads cpp   CXXFLAGS   -O3 -o prog -rdynamic -D GNU SOURCE -L  libmine LIBS   -lpthread -ldl  all        CXX    CXXFILES    LIBS    CXXFLAGS   clean      rm -f prog   o   I am trying to include the   libmine library within CXXFLAGS  but it seems like it is not the right way to include a static library  because when I compile the program  I get many undefined references error  So what is actually the right way to include a static library in the makefile

User · Accepted Answer

CXXFLAGS   -O3 -o prog -rdynamic -D GNU SOURCE -L  libmine LIBS   libmine a -lpthread

User · Answer

Make sure that the -L option appears ahead of the -l option  the order of options in linker command lines does matter  especially with static libraries   The -L option specifies a directory to be searched for libraries  static or shared    The -lname option specifies a library which is with libmine a  static  or libmine so  shared on most variants of Unix  but Mac OS X uses  dylib and HP-UX used to use  sl    Conventionally  a static library will be in a file libmine a   This is convention  not mandatory  but if the name is not in the libmine a format  you cannot use the -lmine notation to find it  you must list it explicitly on the compiler  linker  command line   The -L  libmine option says  there is a sub-directory called libmine which can be searched to find libraries    I can see three possibilities    You have such a sub-directory containing libmine a  in which case you also need to add -lmine to the linker line  after the object files that reference the library   You have a file libmine that is a static archive  in which case you simply list it as a file   libmine with no -L in front    You have a file libmine a in the current directory that you want to pick up   You can either write   libmine a or -L   -lmine and both should find the library

User · Answer

The -L merely gives the path where to find the  a or  so file  What you re looking for is to add -lmine to the LIBS variable  Make that -static -lmine to force it to pick the static library  in case both static and dynamic library exist   Addition  Suppose the path to the file has been conveyed to the linker  or compiler driver  via -L you can also specifically tell it to link libfoo a by giving -l libfoo a  Note that in this case the name includes the conventional lib-prefix  You can also give a full path this way  Sometimes this is the better method to  quot guide quot  the linker to the right location

User · Answer

use   LDFLAGS  -L lt Directory where the library resides gt  -l lt library name gt    Like    LDFLAGS   -L  -lmine   for ensuring static compilation you can also add  LDFLAGS   -static   Or you can just get rid of the whole library searching  and link with with it directly   say you have     main c fun c  and a static library libmine a  then you can just do in your final link line of the Makefile    CC    CFLAGS  main o fun o libmine a

[c] How to include static library in makefile

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