GNU bug report logs - #9859
subdir-objects, dirstamps and --disable-dependency-tracking

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Stefano Lattarini <stefano.lattarini <at> gmail.com>
To: bug-automake <at> gnu.org
Subject: subdir-objects, dirstamps and --disable-dependency-tracking
Date: Mon, 24 Oct 2011 19:47:40 +0200

[Message part 1 (text/plain, inline)]

Hello automakers.

The recent commit `v1.11-512-g40c3432', required to fix automake bugs #8485
and #8526, has re-introduced the bug reported by Ignacy Gawedzki in his
message "subdir-objects, dirstamps and --disable-dependency-tracking (bug?)",
posted to the automake list in March 2011.  I'm thus registering this
bug in the automake tracker so that we won't forget about it.

Regards,
  Stefano

-*-*-*-

Reference:
 <http://lists.gnu.org/archive/html/automake/2011-03/msg00124.html>
a.k.a.:
 <http://thread.gmane.org/gmane.comp.sysutils.automake.general/12768>

-*-*-*-

Original message follows ...

-*-*-*-

Hi,

I suspect I found a bug in automake 1.11.1 .

I have a project in which some program has .ll and .yy sources that must be
generated by flex and bison.  It also happens I need to have specific
preprocessor options passed to that program using a _CPPFLAGS variable.  This
makes everything produced for that program prefixed with the program name.
Besides, I need to use the subdir-objects automake option.

Now the problem is that some subdirectories are not created automatically in
$(builddir) as expected and I think I have found why.  It happens when
configure is called with --disable-dependency-tracking, as is usually the case
when called through debhelper.

In the attached tarball, there is a minimal setup illustrating the problem.
Try to configure and build the project in a separate build directory and you
should be able to observe how automake fails to create $(builddir)/src before 
calling ylwrap to generate src/bug-scanner.cc .

The Makefile has the following rule (number 1):

  src/bug-scanner.$(OBJEXT): src/$(am__dirstamp) \
        src/$(DEPDIR)/$(am__dirstamp)

But the bug_CPPFLAGS line in Makefile.am ultimately leads to the production of
the following rule (number 2):

  src/bug-scanner.o: src/scanner.cc
        ...

Whereas there is *no* rule of the kind :

  src/scanner.cc: src/$(am__dirstamp)
        ...

This looks like src/scanner.cc gets regenerated *before* src/$(am_dirstamp)
gets a chance to be considered, supposedly because of the explicit rule number
2.

Does anybody know of a clean fix/workaround?

Thanks.

Ignacy

[Message part 2 (text/html, inline)]

[automake-dirstamp-bug.tar.gz (application/x-compressed-tar, attachment)]

Message #10 received at 9859 <at> debbugs.gnu.org (full text, mbox):

From: Stefano Lattarini <stefano.lattarini <at> gmail.com>
To: 9859 <at> debbugs.gnu.org
Cc: Ignacy Gawedzki <i <at> lri.fr>
Subject: automake bug#9859 has been fixed in Automake-NG
Date: Fri, 03 Feb 2012 14:35:31 +0100

JFTR: this bug has been fixed in the Automake-NG fork of Automake
(which assumes GNU make is used to execute its generated makefiles);
see commits v1.11-1838-gdc04691 "[ng] yacc, lex: fix subdir VPATH
builds" and v1.11-1839-ge5b964c "[ng] yacc, lex, compiling: better
use of '$<' (simplify and fix bug)" in the 'ng/master' branch of
the official automake repository.

See also:

 <http://lists.gnu.org/archive/html/automake-ng/2012-02/msg00003.html>
 <http://lists.gnu.org/archive/html/automake-ng/2012-02/msg00011.html>

More information about Automake-NG, from its first git commit:

  <http://lists.gnu.org/archive/html/automake-ng/2011-12/msg00000.html>

Regards,
  Stefano

Message #13 received at 9859 <at> debbugs.gnu.org (full text, mbox):

From: Nicholas Brown <brownn <at> brocade.com>
To: <9859 <at> debbugs.gnu.org>
Subject: [PATCH] yacc and lex built objects without dependancy tracking
Date: Fri, 4 Dec 2015 14:09:36 +0000

---
 lib/am/lex.am  | 1 +
 lib/am/yacc.am | 1 +
 2 files changed, 2 insertions(+)

diff --git a/lib/am/lex.am b/lib/am/lex.am
index d7ddc77..6357507 100644
--- a/lib/am/lex.am
+++ b/lib/am/lex.am
@@ -23,6 +23,7 @@ endif %?MAINTAINER-MODE%
 
 ?GENERIC?%EXT%%DERIVED-EXT%:
 ?!GENERIC?%OBJ%: %SOURCE%
+?SUBDIROBJ?	%SILENT%test -d $(dir $@) || $(MKDIR_P) $(dir $@)
 ?GENERIC?	%VERBOSE%$(am__skiplex) $(SHELL) $(YLWRAP) %SOURCE% $(LEX_OUTPUT_ROOT).c %OBJ% -- %COMPILE%
 ?!GENERIC?	%VERBOSE% \
 ?!GENERIC??DIST_SOURCE?	$(am__skiplex) \
diff --git a/lib/am/yacc.am b/lib/am/yacc.am
index 2b3f92a..2c33023 100644
--- a/lib/am/yacc.am
+++ b/lib/am/yacc.am
@@ -43,6 +43,7 @@ endif %?FIRST%
 
 ?GENERIC?%EXT%%DERIVED-EXT%:
 ?!GENERIC?%OBJ%: %SOURCE%
+?SUBDIROBJ?	%SILENT%test -d $(dir $@) || $(MKDIR_P) $(dir $@)
 ?GENERIC?	%VERBOSE%$(am__skipyacc) $(SHELL) $(YLWRAP) %SOURCE% y.tab.c %OBJ% y.tab.h `echo %OBJ% | $(am__yacc_c2h)` y.output %BASE%.output -- %COMPILE%
 ?!GENERIC?	%VERBOSE% \
 ?!GENERIC??DIST_SOURCE?	$(am__skipyacc) \
-- 
2.1.4

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