Error while linking with gcc?

Question

I run the following command to link the different files in my project.

/opt/gcc-4.7-cilkplus/bin/gcc -g -Wall -l /opt/gcc-4.7-cilkplus/lib64/ -o exec main.o \
    mysql-client.o databaseConnection-common.o murmurhash3.o bloom-filter.o
    `mysql_config --cflags --libs\` -lcilkrts

Note the option -l /opt/gcc-4.7-cilkplus/lib64/

When I run this command I get this error:

/usr/bin/ld: cannot find -l/opt/gcc-4.7-cilkplus/lib64/

but this directory is present in my system. Can anyone please tell the mistake.

TJD · Accepted Answer · 2012-06-18 22:34:44Z

3

-l (el) should be followed by a library, not a directory. Perhaps you meant -L or -I (eye)

answered Jun 18, 2012 at 22:34

TJD

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3 Comments

steveha Over a year ago

-L tells the linker a directory to search. It is almost certainly -L.

Aman Deep Gautam Over a year ago

my bad. I got it now. Can you tell some other place to specify these linker library so that I do not have to include then by doing -L each time (like some path variable which gcc searches every time before linking).

TJD Over a year ago

LIBRARY_PATH environment variable

Pedro · Accepted Answer · 2012-06-18 22:35:17Z

0

You are using -l where you should be using -L. The option -l specifies a library, whereas -L specifies a directory in which to look for libraries.

Note also that there is no space between -l or -L and its respective value.

answered Jun 18, 2012 at 22:35

Pedro

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Shahbaz · Accepted Answer · 2012-06-18 22:36:52Z

-Lpath/to/lib -lname is the syntax (without spaces after -L and -l). If linking to a static library for example, this means that link should be done with path/to/lib/libname.a

Also, note that the order of arguments to linker is important. That is, if object A uses library B, B should be written after it. If B itself uses C, then first A should be mentioned, then B and then C.

Your command therefore would probably look like this:

/opt/gcc-4.7-cilkplus/bin/gcc -g -Wall -o exec main.o mysql-client.o \
databaseConnection-common.o murmurhash3.o bloom-filter.o \
`mysql_config --cflags --libs\` -L/opt/gcc-4.7-cilkplus/lib64/ -lcilkrts
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                Used -L and moved here

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