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Re: breaking on open(2) on linux
> From: Vladimir Prus <vladimir@codesourcery.com>
> Date: Wed, 16 Apr 2008 12:09:30 +0400
> Cc: nickrob@snap.net.nz, leisner@rochester.rr.com, gdb@sourceware.org
>
> On Wednesday 16 April 2008 00:34:30 Eli Zaretskii wrote:
> > > From: Vladimir Prus <vladimir@codesourcery.com>
> > > Date: Tue, 15 Apr 2008 12:11:33 +0400
> > >
> > > The multiple location support only works if there line number information
> > > for all locations.
> >
> > This is important enough to mention in the manual. Is it there? if it
> > is, I cannot find it.
>
> It's not there.
It is now (committed):
2008-04-20 Eli Zaretskii <eliz@gnu.org>
* gdb.texinfo (Set Breaks): Mention that multiple location
breakpoints need line number info. Add index entries.
Index: gdb/doc/gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.482
diff -u -r1.482 gdb.texinfo
--- gdb/doc/gdb.texinfo 20 Apr 2008 00:03:25 -0000 1.482
+++ gdb/doc/gdb.texinfo 20 Apr 2008 09:04:38 -0000
@@ -3072,11 +3072,12 @@
the breakpoints are conditional, this is even useful
(@pxref{Conditions, ,Break Conditions}).
+@cindex multiple locations, breakpoints
+@cindex breakpoints, multiple locations
It is possible that a breakpoint corresponds to several locations
in your program. Examples of this situation are:
@itemize @bullet
-
@item
For a C@t{++} constructor, the @value{NGCC} compiler generates several
instances of the function body, used in different cases.
@@ -3088,11 +3089,14 @@
@item
For an inlined function, a given source line can correspond to
several places where that function is inlined.
-
@end itemize
In all those cases, @value{GDBN} will insert a breakpoint at all
-the relevant locations.
+the relevant locations@footnote{
+As of this writing, multiple-location breakpoints work only if there's
+line number information for all the locations. This means that they
+will generally not work in system libraries, unless you have debug
+info with line numbers for them.}.
A breakpoint with multiple locations is displayed in the breakpoint
table using several rows---one header row, followed by one row for