Date: Sun, 31 Mar 1996 15:43:51 +0200 (MET DST) From: grog@lemis.de (Greg Lehey) To: current@freebsd.org Subject: gcc symbols broken in -current? Message-ID: <199603311343.PAA00499@allegro.lemis.de>
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I've just run into a strange problem: when debugging a user-level C
program, the symbolic information is all screwed up. Consider this
backtrace:
> Starting program: /S/FreeBSD/Development/cdtools-1.3/mklinks -k -s2 /src/2.2-CURRENT/src/sys /usr/src/sys
> During symbol reading...unknown symbol type 0x1e...
What's that?
> (gdb) bt
> #0 0x8039848 in link ()
> #1 0x22a1 in checkdir (src=0xefbfd05c "/src/2.2-CURRENT/src/sys/CVS", dst=0xefbfcc5c "/usr/src/sys/CVS")
> at mklinks.c:198
> #2 0x1fc3 in checkdir (src=0xefbfd5ba "/src/2.2-CURRENT/src/sys", dst=0xefbfd5d3 "/usr/src/sys") at mklinks.c:290
> #3 0x3e4f in main (argc=5, argv=0xefbfd4a8) at mklinks.c:674
> (gdb) f 1
> #1 0x22a1 in checkdir (src=0xefbfd05c "/src/2.2-CURRENT/src/sys/CVS", dst=0xefbfcc5c "/usr/src/sys/CVS")
> at mklinks.c:198
> 198 if (dohardlink)
> (gdb) l
> 193 fprintf (stderr, "*** Can't unlink %s: %s\n", srcname, strerror (errno));
> 194 else
> 195 {
> 196 if (verbose > 1)
> 197 fprintf (stderr, "--- Unlinked %s\n", srcname);
> 198 if (dohardlink)
> 199 {
> 200 if (link (srcname, dstname)) /* can't link the new source? */
> 201 fprintf (stderr, "*** Can't link %s to %s: %s\n", srcname, dstname, strerror (errno));
> 202 else if (verbose > 1)
First, the function name for frame 1 is incorrect: it's in
linkreplace, not checkdir. Then the line number is incorrect: it's
200, not 198. The line numbers are, in fact, all off by 2. This
problem obviously comes from the compiler: if I compile the same
source under BSD/386, and then run it under FreeBSD with the same
debugger, things look correct:
> (gdb) bt
> #0 0x3aa4 in link ()
> #1 0x155d in linkreplace (srcname=0xefbfbafc "/src/2.2-CURRENT/src/sys/compile/CVS/Root",
> dstname=0xefbfb6fc "/usr/src/sys/compile/CVS/Root", dohardlink=1) at mklinks.c:200
> #2 0x268b in checkdir (src=0xefbfc5ac "/src/2.2-CURRENT/src/sys/compile/CVS",
> dst=0xefbfc1ac "/usr/src/sys/compile/CVS") at mklinks.c:553
> #3 0x1bb7 in checkdir (src=0xefbfd05c "/src/2.2-CURRENT/src/sys/compile", dst=0xefbfcc5c "/usr/src/sys/compile")
> at mklinks.c:292
> #4 0x1bb7 in checkdir (src=0xefbfd5b9 "/src/2.2-CURRENT/src/sys", dst=0xefbfd5d2 "/usr/src/sys") at mklinks.c:292
> #5 0x2df3 in main (argc=5, argv=0xefbfd4a8) at mklinks.c:676
The error message at the start doesn't get printed, either.
Greg
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