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Date: Thu, 16 Aug 2007 03:27:30 -0700 (PDT)
From: "Salikh Zakirov (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Created: (HARMONY-4640) [drlvm][build] Makefiles for
 building native components of DRLVM
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[drlvm][build] Makefiles for building native components of DRLVM
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                 Key: HARMONY-4640
                 URL: https://issues.apache.org/jira/browse/HARMONY-4640
             Project: Harmony
          Issue Type: New Feature
          Components: DRLVM
         Environment: Linux/x86
            Reporter: Salikh Zakirov


The attached file makefiles.patch provides a new build system, based on GNU Make, coreutils, sed, makedepends etc.
It can build native components of DRLVM, and using the same deploy directory structure, can be used together with official ant-based build for quick recompilations.

This build system solves a number of deficiencies of current build system:
* up-to-date nothing-to-do run decreases from ~50s to ~3s
* stale object files are not linked, so no 'clean' is required when moving source files around
* parallel compilation (make -j) is supported
* it is more efficient on linux: 
    official build: ~6m 50s
    make:   ~5m 30s
    make -j2 (Core Duo): ~2m 50s

Features of this build system:
* automatic header file dependency tracking via makedepend
* automatic linker and compiler flags tracking: recompilation
  or relinking is forced if flags has changed
* automatic source file list tracking: relinking is forced if the
  list of source files has changed. Note, that it does not suffer from
  the stale object files not being removed, as they are just being ignored
* output is as clean and informative as humanly possible

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