On Tue, Jul 16, 2013 at 2:38 AM, Christian Gagneraud <chg...@gna.org> wrote:
> On 16/07/13 08:57, Carl Schumann wrote:
> > Hi,
> >
> > I am using Qt in an environment where there is already a build
> > infrastructure in place. Because of the amount of per-existing non-Qt
> > code it is not feasible to build everything with qmake, e.g., because
> > slot is actually a very common variable and argument name in our
> > existing code base.
> >
> > Therefore, I am trying to add Qt build support to our existing build
> > system only for the programs that need it. I would like to understand
> > what the motivation is for the second command in the link rule of the
> > qmake-generated Makefile please:
> >> $(TARGET): $(OBJECTS)
> >> $(LINK) $(LFLAGS) -o $(TARGET) $(OBJECTS) $(OBJCOMP) $(LIBS)
> >> { test -n "$(DESTDIR)" && DESTDIR="$(DESTDIR)" || DESTDIR=.; } &&
> test $$(gdb --version | sed -e 's,[^0-9]\+\([0-9]\)\.\([0-9]\).*,\1\2,;q')
> -gt 72 && gdb --nx --batch --quiet -ex 'set confirm off' -ex "save
> gdb-index $$DESTDIR" -ex quit '$(TARGET)' && test -f $(TARGET).gdb-index &&
> objcopy --add-section '.gdb_index=$(TARGET).gdb-index' --set-section-flags
> '.gdb_index=readonly' '$(TARGET)' '$(TARGET)' && rm -f $(TARGET).gdb-index
> || true
> Hi Carl,
>
> I'm not an expert with all of these, but obviously, the second command
> adds a GDB index section to the binary target if GDB version is greater
> than 7.2, according to [1], it speeds up GDB when debugging.
> The index is generated with "gdb --nx --batch ..." and the section added
> with "objcopy --add-section ..."
>
Also, this part is added in the Debug builds only.
-mandeep
>
> Hope this helps.
>
> Chris
>
> [1] http://sourceware.org/gdb/onlinedocs/gdb/Index-Files.html
>
> > If it makes a difference this is Qt 4.8.4.
> >
> > Thanks for your time.
> >
> > Sincerely,
> > Carl Schumann
> > _______________________________________________
> > Interest mailing list
> > Interest@qt-project.org
> > http://lists.qt-project.org/mailman/listinfo/interest
>
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