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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 SUSE

lzdiff

XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME

       xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files

SYNOPSIS

       xzcmp [cmp_options] file1 [file2]
       xzdiff [diff_options] file1 [file2]
       lzcmp [cmp_options] file1 [file2]
       lzdiff [diff_options] file1 [file2]

DESCRIPTION

       xzcmp  and  xdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options specified are passed
       directly to cmp or diff.  If only one file is specified, then the files compared are file1 (which must have a suffix of	a  supported  com-
       pression  format)  and  file1 from which the compression format suffix has been stripped.  If two files are specified, then they are uncom-
       pressed if necessary and fed to cmp(1) or diff(1).  The exit status from cmp or diff is preserved.

       The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils.

SEE ALSO

       cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1)

BUGS

       Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified.

Tukaani 							    2009-07-05								 XZDIFF(1)
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