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

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Package: automake; Reported by: Ignacy Gawedzki <i@HIDDEN>; Keywords: confirmed; merged with #27188; dated Mon, 24 Oct 2011 17:50:01 UTC; Maintainer for automake is bug-automake@HIDDEN.
Added tag(s) confirmed. Request was from Mathieu Lirzin <mthl@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Merged 9859 27188. Request was from Mathieu Lirzin <mthl@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: [PATCH] yacc and lex built objects without dependancy tracking
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---
 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
Information forwarded to bug-automake@HIDDEN:
bug#9859; Package automake. Full text available.

Message received at 9859 <at> debbugs.gnu.org:


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From: Stefano Lattarini <stefano.lattarini@HIDDEN>
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Subject: automake bug#9859 has been fixed in Automake-NG
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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
Information forwarded to bug-automake@HIDDEN:
bug#9859; Package automake. Full text available.
Changed bug submitter to 'Ignacy Gawedzki <i@HIDDEN>' from 'Stefano Lattarini <stefano.lattarini@HIDDEN>' Request was from Stefano Lattarini <stefano.lattarini@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at submit <at> debbugs.gnu.org:


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

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">
<html><head><meta name="qrichtext" content="1" /><style type="text/css">
p, li { white-space: pre-wrap; }
</style></head><body style=" font-family:'Bitstream Vera Sans Mono'; font-size:12pt; font-weight:400; font-style:normal;">
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Hello automakers.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">The recent commit `v1.11-512-g40c3432', required to fix automake bugs #8485</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">and #8526, has re-introduced the bug reported by Ignacy Gawedzki in his</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">message &quot;subdir-objects, dirstamps and --disable-dependency-tracking (bug?)&quot;,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">posted to the automake list in March 2011.  I'm thus registering this</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">bug in the automake tracker so that we won't forget about it.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Regards,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">  Stefano</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">-*-*-*-</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Reference:</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"> &lt;http://lists.gnu.org/archive/html/automake/2011-03/msg00124.html&gt;</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">a.k.a.:</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"> &lt;http://thread.gmane.org/gmane.comp.sysutils.automake.general/12768&gt;</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">-*-*-*-</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Original message follows ...</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">-*-*-*-</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Hi,</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">I suspect I found a bug in automake 1.11.1 .</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">I have a project in which some program has .ll and .yy sources that must be</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">generated by flex and bison.  It also happens I need to have specific</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">preprocessor options passed to that program using a _CPPFLAGS variable.  This</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">makes everything produced for that program prefixed with the program name.</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Besides, I need to use the subdir-objects automake option.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Now the problem is that some subdirectories are not created automatically in</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">$(builddir) as expected and I think I have found why.  It happens when</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">configure is called with --disable-dependency-tracking, as is usually the case</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">when called through debhelper.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">In the attached tarball, there is a minimal setup illustrating the problem.</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Try to configure and build the project in a separate build directory and you</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">should be able to observe how automake fails to create $(builddir)/src before </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">calling ylwrap to generate src/bug-scanner.cc .</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">The Makefile has the following rule (number 1):</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">  src/bug-scanner.$(OBJEXT): src/$(am__dirstamp) \</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">        src/$(DEPDIR)/$(am__dirstamp)</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">But the bug_CPPFLAGS line in Makefile.am ultimately leads to the production of</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">the following rule (number 2):</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">  src/bug-scanner.o: src/scanner.cc</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">        ...</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Whereas there is *no* rule of the kind :</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">  src/scanner.cc: src/$(am__dirstamp)</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">        ...</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">This looks like src/scanner.cc gets regenerated *before* src/$(am_dirstamp)</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">gets a chance to be considered, supposedly because of the explicit rule number</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">2.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Does anybody know of a clean fix/workaround?</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Thanks.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Ignacy</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><br /></p></body></html>
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Acknowledgement sent to Stefano Lattarini <stefano.lattarini@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-automake@HIDDEN. Full text available.
Report forwarded to bug-automake@HIDDEN:
bug#9859; Package automake. Full text available.
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