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g++ fails to link to static library when compilation and link in single command

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Old 03-13-2012
g++ fails to link to static library when compilation and link in single command
Hello All,
I've encountered a strange behaviour from g++ that doesn't make sense to me. Maybe you can shed some light on it:

I have a bunch of source files and want to compile them and link them with a static library liba.a located in /usr/local/lib64 into an executable

Approach 1 works fine:
Code:
g++ -c file1.cc
g++ -c file2.cc
g++ -c file3.cc
g++ -o executable file1.o file2.o file3.o -la

Approach 2 doesn't work:
Code:
g++ -o executable file1.cc file2.cc file3.cc -la

That causes a load of undefined references, It's a shame, because method 2 is what my makefile produces.
Can anyone tell me the difference between 1 and 2 and how to fix it?

Thanks a lot,
Bjorn
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LEARN ABOUT PHP

link

LINK(3) 								 1								   LINK(3)

link - Create a hard link

SYNOPSIS

       bool link (string  $target, string  $link)

DESCRIPTION

       link(3) creates a hard link.

PARAMETERS

	      o $target
		- Target of the link.

	      o $link
		- The link name.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  This  function is now available on Windows plat- |
       |	| forms (Vista, Server 2008 or greater).	    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      Creating a simple hard link

	      <?php
	      $target = 'source.ext'; // This is the file that already exists
	      $link = 'newfile.ext'; // This the filename that you want to link it to

	      link($target, $link);
	      ?>

NOTES

       Note

	      This function will not work on remote files as the file to be examined must be accessible via the server's filesystem.

       Note

	       For Windows only: This function requires PHP to run in an elevated mode or with the UAC disabled.

SEE ALSO

       symlink(3), readlink(3), linkinfo(3).

PHP Documentation Group 														   LINK(3)