RJLRef: $RBGB/bdeBuilds.050823
=========================================================
Four bde.exe versions fully rebuilt tonight:  
Run xmkmf -a each time: once with -DLOG on mercury; 
once after configure.h workaround -define LOG 1 on saturn.
TBD: avoid this work-around somehow.

3 out of 4 checked-in Imakefiles now do all 4 versions: 
Imakefiles are in  bde, pr_util_log, pr_util_nolog, and src.
The used Imakefiles are  bde/Imakefile, bde/src/Imakefile,
and either bde/pr_util_nolog/Imakefile or bde/pr_util_log/Imakefile.


During xmkmf -a [-DLOG], 
bde/Imakefile redefines SUBDIRS conditionally on -DLOG and 
generates two new Makefiles there:

-------------------------
#ifdef GENLOG
PRDIR = $(TOP)/pr_util_log
#endif

#ifndef GENLOG
PRDIR = $(TOP)/pr_util_nolog
#endif

SUBDIRS  = $(PRDIR) src

PROBJDIR = $(PRDIR)/$(HOSTTYPE)/probj
BINDIR   = $(PRDIR)/$(HOSTTYPE)/bin
OBJDIR   = $(PRDIR)/$(HOSTTYPE)/obj
-------------------------
New Makefiles are generated in bde, bde/src and bde/$(PRDIR).
Makefile in $PRDIR builds the library pr_util.a;
Makefile in src builds the executable in $PRDIR/$HOSTTYPE/bin.

=======================================================================

Here are the executables:
---------------------
mercury.cs.uml.edu(14)> lg */*/bin/bde.exe
-rwx--x--x    1 lechner  04f522    7010864 Aug 23 20:21 pr_util_log/alpha/bin/bde.exe
-rwx--x--x    1 lechner  fac       2111364 Aug 23 20:55 pr_util_log/i386-linux/bin/bde.exe
-rwx--x--x    1 lechner  04f522    6775200 Aug 23 20:12 pr_util_nolog/alpha/bin/bde.exe
-rwx--x--x    1 lechner  fac       1975405 Aug 23 20:35 pr_util_nolog/i386-linux/bin/bde.exe
----------------------
=====================================
Other differences between builds:

Which src and obj directories are used? 
GOAL: pr_util_[no]log for auto-generated pr*.c files, depending in chgen3 log option,
      pr_util_[no]log/$HOSTTYPE/probj for .o files from pr_util..., 
      pr_util_[no]log/$HOSTTYPE/obj for compiled bde/src files (the shared bde/src).
Current status: src/*.cc  is copied to pr_util_[no]log/obj by the Makefile there,
Each new build recommpiles ALL src and pr_util_* files not just those which changed.

TBD: Make sure old bde/src/*.o are not assumed to be valid on both platforms.
TBD: Arrangeto recompile ONLY the changed files, as make intended.

Inspecting make progress for paths:

===================================================================
CONCLUSION 1: saturn without log: 

Copies *.cc from src to ../pr_util_nolog/alpha/obj
but then compiles src/*.cc to src/*.o and links src/*.o and ../pr_util_nolog/alpha/probj/pr_util.a to ../pr_util_nolog/alpha/bin/bde.exe

----------------------------------------------------------------------
CONCLUSION 2: saturn with #define LOG 1 in bde/configure.h: 

Same as nolog behavior: 
Copies pr_*.c from ../pr_util_log to ../pr_util_log/alpha/probj 
and compiles to pr_util.a `there;   

Compiles src/*.cc in src,  and links src/*.o and
../pr_util_log/alpha/probj/pr_util.a to  ../pr_util_log/alpha/bin/bde.exe 

---------------------------------------------------------------------------
CONCLUSION 3: (mercury nolog: no record)

--------------------------------------------------------------------
CONCLUSION 4: mercury with xmkmf -a -DLOG:

pr_util_log/Makefile  copies ../pr_util_log/pr_*.c to
../pr_util_log/i386-linux/probj, compiles and links pr_*.o there into pr_util.a.

Then src/Makefile copies src/*.cc to ../pr_util_log/i386-linux/obj 
and compiles src/*.cc to src/*.o
Finally, it links these + ../pr_util_log/i386-linux/probj/pr_util.a 
into ../pr_util_log/i386-linux/bin/bde.exe 

===============================================================================