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From: micja@IDA.LiU.SE (Michael Jansson)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Which C-compiler can create true libraries?
Keywords: Amiga libraries.
Message-ID: <1991Jan11.150659.1902@ida.liu.se>
Date: 11 Jan 91 15:06:59 GMT
References: <1991Jan10.130040.13771@ida.liu.se> <1991Jan11.003038.17471@csun.edu>
Sender: news@ida.liu.se (News Subsystem)
Organization: CIS Dept, Univ of Linkoping, Sweden
Lines: 51

In article <1991Jan11.003038.17471@csun.edu> swalton@solaria.csun.edu (Stephen Walton) writes:

[stuff deleted]

>Manx 5.0d has, unfortunately, a couple of new bugs having to do with
>library code generation.  To work around them:
>
>1.  Add a dummy argument (I used int x) to the three routines in
>libsup.c (myOpen, myClose, myExpunge).
>
>2.  Do not optimize the actual library entry points, though
>lower-level routines can be optimized fine.
>-------------------------------
>Stephen Walton, Dept. of Physics & Astronomy, Cal State Univ. Northridge
>   I am srw@csun.edu no matter WHAT the stupid From: line says!


It is just typical that I get this information now when I just discovered
how to use 5.0d last night. Big sigh ;-(. Big thanks to you for the help
anyway!

Further comments on the bugs:

1. This point is valid for not only the three common functions.  Any
function that is compiled which is also #pragma:ed with zero registers as
parameters will result in bad code! (There is a mismatch on the number of
parameters that are pushed/poped on the stack). The solution is to add a
dummy register to all the #pragma:s that don't have any. You don't need
to actually add the dummy parameters to the function.

2. All functions can be optimized if they contains a "geta4()" as the
first line in the function.  (The optimizer seems to be a bit confused
about the use of a4!?) I guess this bug is related to point 1.


I took the res_lib example and made the following changes to make it work:
* Add a geta4() call as the first line in each function.
* Changed the optimizer flag -so to -safmrs (every optimizer switch except
  -sn)
* Added -bs so that I could debug the library with sdb
* Added a dummy 'd0' to all the #pragmas in libsup.c that have zero registers.

It now works very well!


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