c/8962: "-O2 -mmmx" makes gcc seg fault

Tue Jan 7 20:56:00 GMT 2003

The following reply was made to PR c/8962; it has been noted by GNATS.

From: Wolfgang Bangerth <bangerth@ticam.utexas.edu>
To: gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: c/8962: "-O2 -mmmx" makes gcc seg fault
Date: Tue, 7 Jan 2003 14:53:02 -0600 (CST)

 The following is what Mack found out. The testcase is now attached to the 
 report as well.
 W.

 -------------------------------------------------------------------------
 Wolfgang Bangerth             email:            bangerth@ticam.utexas.edu
                               www: http://www.ticam.utexas.edu/~bangerth/

 ---------- Forwarded message ----------
 Date: Tue, 07 Jan 2003 18:07:39 +0000
 From: Mack Lobell <macklobell@hotmail.com>
 To: bangerth@ticam.utexas.edu
 Subject: Re: c/8962: "-O2 -mmmx" makes gcc seg fault

 Hi,

 i have attached my shorten expr.i. This is what i get when i compile:

 $ $CC33 -mmmx -O2 expr.i
 expr.i:1664: warning: `struct diagnostic_context' declared inside parameter 
 list
 expr.i:1664: warning: its scope is only this definition or declaration, 
 which is probably not what you want
 expr.i: In function `expand_expr':
 expr.i:1932: warning: assignment makes pointer from integer without a cast
 expr.i:1958: warning: assignment makes pointer from integer without a cast
 expr.i:1960: warning: assignment makes pointer from integer without a cast
 expr.i:1962: warning: assignment makes pointer from integer without a cast
 expr.i:1971: warning: assignment makes pointer from integer without a cast
 expr.i:1985: warning: assignment makes pointer from integer without a cast
 expr.i:2007: warning: assignment makes pointer from integer without a cast
 expr.i:2027: warning: assignment makes pointer from integer without a cast
 expr.i:2055: warning: assignment makes pointer from integer without a cast
 expr.i:2073: warning: return makes pointer from integer without a cast
 expr.i:2076: warning: return makes pointer from integer without a cast
 expr.i:2096: warning: assignment makes pointer from integer without a cast
 expr.i:2102: warning: assignment makes pointer from integer without a cast
 expr.i:2153: warning: return makes pointer from integer without a cast
 expr.i:2156: warning: return makes pointer from integer without a cast
 expr.i:2160: warning: return makes pointer from integer without a cast
 expr.i:2165: warning: return makes pointer from integer without a cast
 expr.i:2183: warning: assignment makes pointer from integer without a cast
 expr.i:2199: warning: assignment makes pointer from integer without a cast
 expr.i:2211: warning: assignment makes pointer from integer without a cast
 expr.i:2223: warning: initialization makes pointer from integer without a 
 cast
 expr.i:2224: warning: initialization makes pointer from integer without a 
 cast
 expr.i:2239: warning: assignment makes pointer from integer without a cast
 expr.i:2278: warning: assignment makes pointer from integer without a cast
 expr.i:2279: warning: assignment makes pointer from integer without a cast
 expr.i:2281: warning: assignment makes pointer from integer without a cast
 expr.i:2311: warning: assignment makes pointer from integer without a cast
 expr.i:2312: warning: assignment makes pointer from integer without a cast
 expr.i:2314: warning: assignment makes pointer from integer without a cast
 expr.i:2359: warning: assignment makes pointer from integer without a cast
 expr.i:2364: warning: assignment makes pointer from integer without a cast
 expr.i:2366: warning: assignment makes pointer from integer without a cast
 expr.i:2369: warning: assignment makes pointer from integer without a cast
 expr.i:2376: warning: assignment makes pointer from integer without a cast
 expr.i:2380: warning: assignment makes pointer from integer without a cast
 expr.i:2387: warning: assignment makes pointer from integer without a cast
 expr.i:2388: warning: pointer/integer type mismatch in conditional 
 expression
 expr.i:2408: warning: return makes pointer from integer without a cast
 expr.i:2410: warning: return makes pointer from integer without a cast
 expr.i:2434: warning: assignment makes pointer from integer without a cast
 expr.i:2457: warning: assignment makes pointer from integer without a cast
 expr.i:2459: warning: assignment makes pointer from integer without a cast
 expr.i:2462: warning: return makes pointer from integer without a cast
 expr.i:2525: warning: assignment makes pointer from integer without a cast
 expr.i:2530: warning: assignment makes pointer from integer without a cast
 expr.i:2535: warning: assignment makes pointer from integer without a cast
 expr.i:2543: warning: return makes pointer from integer without a cast
 expr.i:2557: warning: return makes pointer from integer without a cast
 expr.i:2578: warning: return makes pointer from integer without a cast
 expr.i:2590: warning: assignment makes pointer from integer without a cast
 expr.i:2604: warning: assignment makes pointer from integer without a cast
 expr.i:2616: warning: assignment makes pointer from integer without a cast
 expr.i:2624: warning: assignment makes pointer from integer without a cast
 expr.i:2629: warning: assignment makes pointer from integer without a cast
 expr.i:2655: warning: assignment makes pointer from integer without a cast
 expr.i:2662: warning: assignment makes pointer from integer without a cast
 expr.i:2675: warning: return makes pointer from integer without a cast
 expr.i:2722: warning: assignment makes pointer from integer without a cast
 expr.i:2725: warning: assignment makes pointer from integer without a cast
 expr.i:2792: warning: assignment makes pointer from integer without a cast
 expr.i:2844: warning: assignment makes pointer from integer without a cast
 expr.i:2870: warning: assignment makes pointer from integer without a cast
 expr.i:2884: warning: assignment makes pointer from integer without a cast
 expr.i:2890: warning: return makes pointer from integer without a cast
 expr.i:2894: warning: assignment makes pointer from integer without a cast
 expr.i:2899: warning: assignment makes pointer from integer without a cast
 expr.i:2913: warning: assignment makes pointer from integer without a cast
 expr.i:2955: warning: assignment makes pointer from integer without a cast
 expr.i:2974: warning: assignment makes pointer from integer without a cast
 expr.i:2984: warning: assignment makes pointer from integer without a cast
 expr.i:3049: warning: assignment makes pointer from integer without a cast
 expr.i:3097: warning: assignment makes pointer from integer without a cast
 expr.i:3116: warning: initialization makes pointer from integer without a 
 cast
 expr.i:3131: warning: assignment makes pointer from integer without a cast
 expr.i:3139: warning: initialization makes pointer from integer without a 
 cast
 expr.i:3148: warning: return makes pointer from integer without a cast
 expr.i:3163: warning: assignment makes pointer from integer without a cast
 expr.i:3167: internal compiler error: Segmentation fault
 Please submit a full bug report,
 with preprocessed source if appropriate.
 See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

 I hope you don't mind the warnings?

 //Regards

 >From: Wolfgang Bangerth <bangerth@ticam.utexas.edu>
 >To: Mack Lobell <macklobell@hotmail.com>
 >CC: gcc-bugs@gcc.gnu.org, <gcc-gnats@gcc.gnu.org>
 >Subject: Re: c/8962: "-O2 -mmmx" makes gcc seg fault
 >Date: Fri, 3 Jan 2003 17:53:52 -0600 (CST)
 >
 >
 >Hi Mack,
 >
 > > i removed all functions except the one that makes gcc crash. I have also
 > > removed some parts of the code in this function. The file is now ~14000
 > > lines of code, where the function is ~3000 lines and the rest are types,
 > > forward declarations, etc..
 > >
 > > If i try to remove any more code in the function the compiler won't 
 >crash.
 > > Even if i remove something simple as an assignment the compiler starts 
 >to
 > > work. I have also noticed that if i remove an unused type (e.g. typedef
 > > _fpos_t fpos_t;) the compiler starts to work.
 > >
 > > Basically i'm stuck, i can't get it smaller than this. Do you have any
 > > "tricks" to reduce the size?
 >
 >If you can't shorten the testcase further, then so be it. There just seem
 >to be such reports. If you want to try something else, there is a project
 >for automatic reduction of testcases. I haven't tried it myself, and it is
 >said to be slow, but maybe you want something that runs during the night,
 >or on a weekend. Take a look at the Delta Debugging project at
 >   http://www.st.cs.uni-sb.de/dd/
 >
 >If you send it to me in private mail, I can attach your somewhat-reduced
 >testcase to the PR.
 >
 >Regards
 >   Wolfgang
 >
 >-------------------------------------------------------------------------
 >Wolfgang Bangerth              email:           bangerth@ticam.utexas.edu
 >                                www: http://www.ticam.utexas.edu/~bangerth

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