diff2.0 bug

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2 total messages Started by Michael D Brennan Tue, 13 Oct 1992 15:41

#905

Author: Michael D Brennan
Date: Tue, 13 Oct 1992 15:41

49 lines
1801 bytes

The following setup with diff2.0 core dumps:

GNU diff version 2.0
compiled gcc2.2.2 -O2 -g  (does not happen -g only)

sun sparc station ipc, os4.1.1


gdb output follows.  The two input files to diff are 42K so I'll
only send them if you want them.

--
Mike Brennan
brennan@boeing.com



(gdb) run mawk/man/mawk.doc mawk112/man/mawk.doc
Starting program: /usr/brennan/diff-2.0/diff mawk/man/mawk.doc mawk112/man/mawk.doc

Program received signal 11, Segmentation fault
0x3e6c in diag (xoff=0, xlim=1167, yoff=0, ylim=1108, cost=0xf7ffebe4)
    at analyze.c:93
93	  bd[bmid] = xlim;
(gdb) where
#0  0x3e6c in diag (xoff=0, xlim=1167, yoff=0, ylim=1108, cost=0xf7ffebe4)
    at analyze.c:93
#1  0x4554 in compareseq (xoff=0, xlim=1167, yoff=0, ylim=1108)
    at analyze.c:266
#2  0x5178 in diff_2_files (filevec=0xf7ffecf8, depth=0) at analyze.c:818
#3  0x3cec in compare_files (dir0=0x0, name0=0xf7fff067 "mawk/man/mawk.doc", 
    dir1=0x0, name1=0xf7fff079 "mawk112/man/mawk.doc", depth=0) at diff.c:802
#4  0x3000 in main (argc=3, argv=0xf7ffef24) at diff.c:524
(gdb) info locals
fd = (int *) 0x35a18
bd = (int *) 0x37df8
xv = (int *) 0x2fd18
yv = (int *) 0x323e0
dmin = -1108
dmax = 1167
fmid = 0
bmid = 59
fmin = 0
fmax = 0
bmin = -143015844
bmax = -143015844
c = 1
odd = 0
(gdb) quit

Re: diff2.0 bug

#909

Author: Paul Eggert
Date: Wed, 14 Oct 1992 03:31

14 lines
973 bytes

brennan@baker.ds.boeing.COM (Michael D Brennan) writes:

	The following setup with diff2.0 core dumps:

	GNU diff version 2.0
	compiled gcc2.2.2 -O2 -g  (does not happen -g only)

	sun sparc station ipc, os4.1.1

A bug causes GCC 2.2.2 (sparc, with the -O2 option) to generate
incorrect code for the diag routine of GNU diff.
To work around the problem, compile diff with plain -O instead.
This bug was reported to bug-gcc in late July,
and I think it will be fixed when GCC 2.3 comes out.

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