Re: [PATCH] Makefile fix

[Mark Kettenis <mark.kettenis@xs4all.nl>]

> Date: Fri, 7 Feb 2014 21:00:35 -0800
> From: Doug Evans <dje@google.com>
> 
> On Tue, Feb 4, 2014 at 2:33 AM, Mark Kettenis <mark.kettenis@xs4all.nl> wrote:
> > The diff below fixes an issue that has been bothering me for quite a
> > while.  When using OpenBSD make, almost everything in gdb/ gets
> > rebuilt.  The problem is the use of the all-lib phony target, which is
> > always considered to be out-of-date, and used as a prerequisite of
> > libgnu.a and the gnulib string.h, which are therefore also considered
> > to be out-of-date.  I have no idea why this problem doesn't show up
> > with GNU make.  But the GNU make manual clearly states that phony
> > targets should not be prerequisites of real target files:
> >
> >   <http://www.gnu.org/software/make/manual/make.html#Phony-Targets>
> >
> > It seems to me that the phony target can be easily avoided; see the
> > diff below.  But perhaps I'm missing something?
> >
> >
> >
> > diff --git a/gdb/Makefile.in b/gdb/Makefile.in
> > index ed84e35..937478b 100644
> > --- a/gdb/Makefile.in
> > +++ b/gdb/Makefile.in
> > @@ -1263,10 +1263,8 @@ gdb$(EXEEXT): gdb.o $(LIBGDB_OBS) $(ADD_DEPS) $(CDEPS) $(TDEPLIBS)
> >                 $(TDEPLIBS) $(TUI_LIBRARY) $(CLIBS) $(LOADLIBES)
> >
> >  # Convenience rule to handle recursion.
> > -$(LIBGNU) $(GNULIB_H): all-lib
> > -all-lib: $(GNULIB_BUILDDIR)/Makefile
> > +$(LIBGNU) $(GNULIB_H): $(GNULIB_BUILDDIR)/Makefile
> >         @$(MAKE) $(FLAGS_TO_PASS) DO=all DODIRS=$(GNULIB_BUILDDIR) subdir_do
> > -.PHONY: all-lib
> >
> >  # Convenience rule to handle recursion.
> >  .PHONY: all-data-directory
> 
> I found the patch where this went in but I couldn't find anything interesting.
> "all-lib" is there, I'm guessing, just as a convenience for typing,
> but I'm not sure how often it's used so if it's getting in the way I'm
> ok with this change.
> I can't think of any problems with the patch.
> [And we could still keep all-lib as a convenience rule, but I'm ok
> with deleting it for now.]

Thanks.  Here's what I committed:

From 0a6bd22df74bb5b6ffa30c3b10243a34d9055c32 Mon Sep 17 00:00:00 2001
From: Mark Kettenis <kettenis@gnu.org>
Date: Sat, 8 Feb 2014 12:36:17 +0100
Subject: [PATCH] A phony target should not be a prerequisite of a real target
 file

gdb/ChangeLog:

	* Makefile.in (all-lib): Remove.
	($(LIBGNU) $(GNULIB_H)): Replace with gits of remove all-lib target.
---
 gdb/ChangeLog   | 5 +++++
 gdb/Makefile.in | 4 +---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c2c9236..bb64a23 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2014-02-08  Mark Kettenis  <kettenis@gnu.org>
+
+	* Makefile.in (all-lib): Remove.
+	($(LIBGNU) $(GNULIB_H)): Replace with gits of remove all-lib target.
+
 2014-02-07  Doug Evans  <dje@google.com>
 
 	* extension-priv.h (extension_language_script_ops): Add comment.
diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index e714550..0976615 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -1265,10 +1265,8 @@ gdb$(EXEEXT): gdb.o $(LIBGDB_OBS) $(ADD_DEPS) $(CDEPS) $(TDEPLIBS)
 		$(TDEPLIBS) $(TUI_LIBRARY) $(CLIBS) $(LOADLIBES)
 
 # Convenience rule to handle recursion.
-$(LIBGNU) $(GNULIB_H): all-lib
-all-lib: $(GNULIB_BUILDDIR)/Makefile
+$(LIBGNU) $(GNULIB_H): $(GNULIB_BUILDDIR)/Makefile
 	@$(MAKE) $(FLAGS_TO_PASS) DO=all DODIRS=$(GNULIB_BUILDDIR) subdir_do
-.PHONY: all-lib
 
 # Convenience rule to handle recursion.
 .PHONY: all-data-directory
-- 
1.8.5.3