Conference smurf::buildhelp

17.0. "What is the Compilation optimization level should be used" by AOSG::TAPPAN () Thu Apr 29 1993 15:02

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Subject: Compilation Optimization Level?


Hi,

What is the Compilation optimization level do I have when I build
a /usr/bin/sort command from my sandbox? 

Level 1, 2 or 3? How can I found out?


Thanks,
Wen-Jie

~~~~~~~~~~~~~~~~~~~Standard.mk~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.
.
.
#
#  Compilation optimization level.  This should be set to whatever
#  combination of -O and -g flags you desire.  Defaults to -O.
#
#  Allow these flags to be overridden per target
#
CC_OPT_LEVEL=${CC_OPT_LEVEL?${CC_OPT_LEVEL}:-O}
_CC_OPT_LEVEL_=${${@}_CC_OPT_LEVEL?${${@}_CC_OPT_LEVEL}:${CC_OPT_LEVEL}}
_CC_OL_=${${@}_OPT_LEVEL?${${@}_OPT_LEVEL}:${OPT_LEVEL?${OPT_LEVEL}:${_CC_OPT_LE
VEL_}}}
.
.
.
.



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Date: Thu, 29 Apr 1993 16:51:39 -0400
From: jmcg (Jim McGinness)
To: tappan
Subject: Compilation Optimization Level

> What is the Compilation optimization level do I have when I build
> a /usr/bin/sort command from my sandbox? 

> Level 1, 2 or 3? How can I found out?

The complicated expression in template.mk allows the optimization level
to be set for a specific module using the typical ODE makefile style.
To see what level is actually used on a build, you should be able to
ascertain it from the build log.  Because there are so many places where
the original default could have been overridden, it's difficult to predict
what value you will see in *your* sandbox--but chances are it's the same
as in the backing tree.

For agosmaint.nightly, the log entry for compiling sort contains:

usr_bin.log:/usr/build/osf1/agosmaint.bld/tools/alpha/cc/cc  -std0 -EL -c
	-DBSD44 -DMSG -DNLS -DMACH -DCMU -DOSF  -Dalpha -D__alpha__ -D__alpha
	-Dunix -D__unix__   -D_SHARED_LIBRARIES  -O        -I  `genpath -I.`
	`genpath   ` -I/usr/build/osf1/agosmaint.bld/export/alpha/usr/include
	../../../../../src/usr/bin/sort/sort.c

which still has just a -O.  According to the manpage, that's equivalent
to -O2.