title: Can't turn off gcc optimizer, Makefile from automake
body: <p>I am trying to get <a href="http://zbar.sourceforge.net/" rel="noreferrer">ZBar</a> in a debug session.  I am able to do so, but I can't get the optimizer to turn off, so my debug session jumps around unexpectedly and many variables are labeled as <code>optimized-out</code> in Eclipse Indigo.  I am running in Ubuntu. </p>
  
  <p>I have tried adding -O0 as far right in any gcc call in the Makefiles as possible, since the last -O is the acting one. I used -Q --help=optimizers to find what to be looking for, but its output is a bit odd:</p>
  
  <pre><code>libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I./include -I./zbar -I./include -O0 -O0 -Q --help=optimizers -Wall -Wno-parentheses -O0 -g -O0 -Q --help=optimizers -MT zbar/zbar_libzbar_la-config.lo -MD -MP -MF zbar/.deps/zbar_libzbar_la-config.Tpo -c zbar/config.c  -fPIC -DPIC -o zbar/.libs/zbar_libzbar_la-config.o
  The following options control optimizations:
  make[1]: *** [zbar/zbar_libzbar_la-config.lo] Error 1
    -O&lt;number&gt;                        
  make: *** [all] Error 2
    -Ofast                            
    -Os                               
    -falign-functions                 [disabled]
    -falign-jumps                     [disabled]
    -falign-labels                    [disabled]
    -falign-loops                     [disabled]
    -fasynchronous-unwind-tables      [enabled]
    -fbranch-count-reg                [enabled]
    -fbranch-probabilities            [disabled]
    -fbranch-target-load-optimize     [disabled]
    -fbranch-target-load-optimize2    [disabled]
    -fbtr-bb-exclusive                [disabled]
    -fcaller-saves                    [disabled]
    -fcombine-stack-adjustments       [disabled]
    -fcommon                          [enabled]
    -fcompare-elim                    [disabled]
  
  etc...
  </code></pre>
  
  <p>Obviously, I've been putting -O0 in several places. I don't have any experience with automake, which is used by ZBar.  I'm trying to avoid having to make my own Makefile from scratch, are there any suggestions on where to look to disable the optimizer?  I have already searched the Makefiles for all the <code>-O</code>'s and any <code>-f</code>'s related to optimization; I've found none.  The project was cleaned after the Makefile modification attempts were made.</p>