From e3e94f141e15f5501ed81402a70beb10b85ccd6f Mon Sep 17 00:00:00 2001
From: Norbert Thiebaud <nthiebaud@gmail.com>
Date: Sat, 17 Dec 2011 10:54:24 -0600
Subject: use a c-version of concat-deps.pl

This touch configure.in with a trivial space removal to force a
./bootstrap on the tinderboxes

This make ./bootstrap build a 'build-side' executable concat-deps
and modify LinkTarget.mk to use it instead of concat-deps.pl

The impact is a conservative x10 times improvement in both elapsed and
cpu time in overhead due to DEP generations.


time make -sr build in tail_build after removing
workdir/$INPATH/Dep/LinkTarget/Library/*

(all on Intel X3360, 2.83GHz, 4-core)

before:
elapsed: 116.5 cpu: 115.9
after
elapsed: 24.3 cpu: 23.9
base (no dep processing, i.e no rm of Dep/...)
elapsed: 17.5 cpu: 17.4
overhead ratio:
elapsed: 14.5x cpu: 15x

same with -j6
before:
elapsed: 47 cpu: 116
after:
elapsed: 20.8 cpu: 24
base:
elapsed: 17.5 cpu: 17.5
overhead ratio:
elapsed: 9x cpu: 15x

Note: for now the executable is generated directly in the source tree
(in solevn/bin ). That is not ideal. It and other similar polution
should be moved, to workdir most likely..
For now we just hide the mess under the .gitignore carpet
---
 bootstrap | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'bootstrap')

diff --git a/bootstrap b/bootstrap
index 1bf5068f02b7..da1192c48882 100755
--- a/bootstrap
+++ b/bootstrap
@@ -74,6 +74,10 @@ if test "$BUILD_DMAKE" != "NO"; then
     echo "dmake copied to $SOLARENV/$OUTPATH_FOR_BUILD/bin/dmake$EXEEXT"
 fi
 
+# build concat-deps
+echo "building concat-deps"
+$CC_FOR_BUILD -O2 "$SOLARENV/bin/concat-deps.c" -o "$SOLARENV/bin/concat-deps" || exit
+
 #make sure build.pl is executable
 
 chmod +x "$SRC_ROOT/solenv/bin/build.pl"
-- 
cgit