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Full Discussion: A question about Makefile run by GNU make
Top Forums Programming A question about Makefile run by GNU make Post 302423067 by jharish on Thursday 20th of May 2010 05:54:55 AM
Old 05-20-2010
In simple words the error means there are two main functions since you have included file1.c twice here
Code:
gcc file1.c mathfun1.o file1.c -o file1

What you can do to solve your problem is build two object files mathfun1.o and file1.o and build the executable "file1" including both these object files. Your makefile would look something like this
Code:
CCFLAGS=-c -Wall
CC=gcc

file1:mathfun1.o file1.o
        $(CC) $^ -o $@

file1.o:file1.c
        $(CC) $(CCFLAGS) file1.c
mathfun1.o:mathfun1.c
        $(CC) $(CCFLAGS) mathfun1.c

clean:
        rm *.o file1

Regards,
Harish J
This User Gave Thanks to jharish For This Post:
dariyoosh
 

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LEARN ABOUT PLAN9

dh_auto_install

DH_AUTO_INSTALL(1)						     Debhelper							DH_AUTO_INSTALL(1)

NAME

       dh_auto_install - automatically runs make install or similar

SYNOPSIS

       dh_auto_install [buildsystemoptions] [debhelperoptions] [--params]

DESCRIPTION

       dh_auto_install is a debhelper program that tries to automatically install built files. It does so by running the appropriate command for
       the build system it detects the package uses. For example, if there's a Makefile and it contains a install target, then this is done by
       running make (or MAKE, if the environment variable is set). If there is a setup.py or Build.PL, it is used. Note that the Ant build system
       does not support installation, so dh_auto_install will not install files built using Ant.

       Unless --destdir option is specified, the files are installed into debian/package/ if there is only one binary package. In the multiple
       binary package case, the files are instead installed into debian/tmp/, and should be moved from there to the appropriate package build
       directory using dh_install(1).

       DESTDIR is used to tell make where to install the files.  If the Makefile was generated by MakeMaker from a Makefile.PL, it will
       automatically set PREFIX=/usr too, since such Makefiles need that.

       This is intended to work for about 90% of packages. If it doesn't work, or tries to use the wrong install target, you're encouraged to skip
       using dh_auto_install at all, and just run make install manually.

OPTIONS

       See "BUILD SYSTEM OPTIONS" in debhelper(7) for a list of common build system selection and control options.

       --destdir=directory
	   Install files into the specified directory. If this option is not specified, destination directory is determined automatically as
	   described in the "DESCRIPTION" section.

       -- params
	   Pass params to the program that is run, after the parameters that dh_auto_install usually passes.

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

11.1.6ubuntu2							    2018-05-10							DH_AUTO_INSTALL(1)
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