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  1. Where `gcc -MMD' puts .d files

    Alexander Klimov <ask@wisdom.weizmann.ac.il> — 2001-05-08T11:53:27Z

    Hi.

After `configure --enable-depend' I try `make' and got
gmake[3]: Entering directory
`/tmp_mnt/hosts/wisdom/NewSoftware/Ask/build/pgsql/src/backend/port'
gcc  -Wall -Wmissing-prototypes -Wmissing-declarations
-I../../../src/include   -c -o ../../utils/strdup.o ../../utils/strdup.c
-MMD
cp: ../../utils/strdup.d: No such file or directory
gmake[3]: *** [../../utils/strdup.o] Error 1
gmake[3]: *** Deleting file `../../utils/strdup.o'
gmake[3]: Leaving directory
`/tmp_mnt/hosts/wisdom/NewSoftware/Ask/build/pgsql/src/backend/port'

The reason is that gcc has bug (or changed feature) in determing there to
put .d files: `gcc -MMD x/a.c -c -o x/a.o' puts a.d to the current
directory if its version is `2.92.2 19991024', and in x, if its version is
`3.1 20010430'. It is looks like the makefile assumes the new
behaviour. (Actually, I guess, nobody faced the issue, because developer's
systems has `strdup')

It is looks like the following patch solves the problem:
Index: src/Makefile.global.in
===================================================================
RCS file: /home/projects/pgsql/cvsroot/pgsql/src/Makefile.global.in,v
retrieving revision 1.123
diff -C2 -r1.123 Makefile.global.in
*** src/Makefile.global.in      2001/03/10 10:38:59     1.123
--- src/Makefile.global.in      2001/05/08 10:07:30
***************
*** 367,375 ****
  # subdirectory, with the dummy targets as explained above.
  define postprocess-depend
! @if test ! -d $(DEPDIR); then mkdir $(DEPDIR); fi
! @cp $*.d $(df).P
! @sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
!      -e '/^$$/ d' -e 's/$$/ :/' < $*.d >> $(df).P
! @rm -f $*.d
  endef
  
--- 367,377 ----
  # subdirectory, with the dummy targets as explained above.
  define postprocess-depend
! @if test ! -d $(DEPDIR); then mkdir $(DEPDIR); fi; \
! if test -f $*.d; then dfile=$*.d ; \
!  else dfile=`basename $*.d` ; fi; \
! cp $$dfile $(df).P; \
! sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
!     -e '/^$$/ d' -e 's/$$/ :/' < $$dfile >> $(df).P; \
! rm -f $$dfile
  endef

 
BTW: Is there documentation about build process (makefiles structure,
etc.)?

Another tiny (for quick computer) thing: is it necessary for `make
distclean' to call configure, or something is wrong with my environment?

And yet another: is it OK for `make depend' to produce
gcc -MM  -Wall -Wmissing-prototypes -Wmissing-declarations -Wno-error *.c>depend
analyze.c:14: postgres.h: No such file or directory
analyze.c:16: access/heapam.h: No such file or directory
...

Regards,
ASK

P.S. Search in the mailing lists for `-MMD' failed with 
Output from Glimpse: 
glimpse: error in options or arguments to `agrep'

  2. Re: Where `gcc -MMD' puts .d files

    Peter Eisentraut <peter_e@gmx.net> — 2001-05-08T15:15:24Z

    Alexander Klimov writes:

> The reason is that gcc has bug (or changed feature) in determing there to
> put .d files: `gcc -MMD x/a.c -c -o x/a.o' puts a.d to the current
> directory if its version is `2.92.2 19991024', and in x, if its version is
> `3.1 20010430'.

I have a patch for (better) dependency tracking with gcc >= 3 which will
hit CVS soon.  Until then, use released compilers or don't use dependency
tracking. :-( (The last couple of times I tried gcc >= 3 with PostgreSQL
it was a complete disaster anyway, so the former is a good idea in any
case ;-).)

> BTW: Is there documentation about build process (makefiles structure,
> etc.)?

Nope.  But some should perhaps be written.

> Another tiny (for quick computer) thing: is it necessary for `make
> distclean' to call configure, or something is wrong with my environment?

Hard to tell.  Make sure the config.cache isn't messing you up.

> And yet another: is it OK for `make depend' to produce

make depend doesn't officially exist anymore.

-- 
Peter Eisentraut   peter_e@gmx.net   http://funkturm.homeip.net/~peter

  3. Re: Where `gcc -MMD' puts .d files

    Alexander Klimov <ask@wisdom.weizmann.ac.il> — 2001-05-08T15:22:09Z

    On Tue, 8 May 2001, Peter Eisentraut wrote:
> I have a patch for (better) dependency tracking with gcc >= 3 which will
> hit CVS soon.  Until then, use released compilers or don't use dependency
> tracking. :-( (The last couple of times I tried gcc >= 3 with PostgreSQL
> it was a complete disaster anyway, so the former is a good idea in any
> case ;-).)
The point is that I do use gcc 2.95.2, and it puts .d file in the curent
directory, not to the directory there files come from. Anyway, my patch
solve the problem at least for me.

Regards,
ASK

  4. Re: Where `gcc -MMD' puts .d files

    Peter Eisentraut <peter_e@gmx.net> — 2001-05-08T16:57:06Z

    Alexander Klimov writes:

> The point is that I do use gcc 2.95.2, and it puts .d file in the curent
> directory, not to the directory there files come from. Anyway, my patch
> solve the problem at least for me.

I see the problem, the port/Makefile needs some changes because it's
trying to put output files outside the current directory.  Try this patch:

diff -c -r1.28 Makefile.in
*** Makefile.in 2000/12/11 00:49:54     1.28
--- Makefile.in 2001/05/08 16:42:20
***************
*** 22,29 ****
  include $(top_builddir)/src/Makefile.global

  OBJS = dynloader.o @INET_ATON@ @STRERROR@ @MISSING_RANDOM@ @SRANDOM@
! OBJS+= @GETHOSTNAME@ @GETRUSAGE@ @STRCASECMP@ @STRDUP@ @TAS@ @ISINF@
  OBJS+= @STRTOL@ @STRTOUL@ @SNPRINTF@
  ifeq ($(PORTNAME), qnx4)
  OBJS += getrusage.o qnx4/SUBSYS.o
  endif
--- 22,32 ----
  include $(top_builddir)/src/Makefile.global

  OBJS = dynloader.o @INET_ATON@ @STRERROR@ @MISSING_RANDOM@ @SRANDOM@
! OBJS+= @GETHOSTNAME@ @GETRUSAGE@ @STRCASECMP@ @TAS@ @ISINF@
  OBJS+= @STRTOL@ @STRTOUL@ @SNPRINTF@
+ ifdef STRDUP
+ OBJS += $(top_builddir)/src/utils/strdup.o
+ endif
  ifeq ($(PORTNAME), qnx4)
  OBJS += getrusage.o qnx4/SUBSYS.o
  endif
***************
*** 56,61 ****
--- 59,68 ----

  tas.o: tas.s
        $(CC) $(CFLAGS) -c $<
+
+ $(top_builddir)/src/utils/strdup.o:
+       $(MAKE) -C $(top_builddir)/src/utils strdup.o
+

  distclean clean:
        rm -f SUBSYS.o $(OBJS)
===snip

-- 
Peter Eisentraut   peter_e@gmx.net   http://funkturm.homeip.net/~peter