CS 213 Spring '00
Homework 1

Homework Assignment H1 (ps, pdf)

Notes:

• Solutions can be found here:
  • HOME213/H1/solutions
• The homework is due Tuesday (night), Feb. 15.
• The following handout may be helpful for this assignment:
  • Handout 2: IA32/Linux Assembly ( ps pdf )
• Contrary to the original schedule, this assignment contains only a single part, and has not been broken up into parts A and B. The due date is the date that was originally posted for part B (i.e. February 15th).
• The original handout (which was given out in class on February 1st) contained the following two typos which have now been corrected:
  • Ignore the "Part A" in the handout title (there is no part B).
  • The hint for b11 says b10.c where it should say b11.c.
• The confusion over the version of gcc on the fish cluster was due to using /usr/bin/gcc (the default in my PATH) vs. /usr/local/bin/gcc (the default in your PATHs). The former is version 2.7.2.3, and the latter is version 2.95.2. You can check this for yourselves as follows:

    > /usr/bin/gcc -v
    Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.7.2.3/specs
    gcc version 2.7.2.3
  
    > /usr/local/bin/gcc -v
    Reading specs from /usr/local/libexec/gcc-2.95.2/lib/gcc-lib/i686-pc-linux-gnu/2.95.2/specs
    gcc version 2.95.2 19991024 (release)
  

  You can type "which gcc" to see which version you use by default.

  There are two ways to eliminate this confusion, and both are equally good. If you prefer to use gcc version 2.7.2.3, the easiest thing to do is to copy a new file called "Makefile_for_gcc_2.7.2.3" in the H1 directory into your local directory. The only difference with this Makefile is that it defines "CC" to be "/usr/bin/gcc" rather than just "gcc". Hence you can do the following:

   > cd ~/213hw/H1
   > cp /afs/cs/academic/class/15213-s00/H1/Makefile_for_gcc_2.7.2.3 Makefile
  

  You may have to remove a1.s, etc. before you type "make a1.s" in order for the Makefile to decide that it is stale. Using this Makefile, you should be able to generate assembly and object files that are identical to the *-solve.[so] files that we gave you.

  The second option is to continue using the version of gcc that you are already using (i.e. 2.95.2), but compare your output with the assembly and object files in /afs/cs/academic/class/15213-s00/H1/gcc_2.95.2_files. These files were generated using /usr/local/bin/gcc on the fish cluster.

• There is a name collision between "handin" in the Makefile and the "handin" symbolic link in your 213hw/H1 directory which prevents "make handin" from working. To fix this, either rename the "handin" symbolic link to something else (e.g., "handin_dir") or else simply delete it, and then "make handin NAME=yourname VERSION=XX" will work.

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