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List:       icu
Subject:    icu4c proposal: modularize icu4c library code/turn off parts
From:       Markus Scherer <markus.scherer () jtcsv ! com>
Date:       2002-09-19 20:44:49
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Proposal to add #if switches in the ICU4C library code to easily turn off parts of it \
at build-time. This is to build smaller ICU libraries for special purposes while \
maintaining a testable ICU build.

Expiration: Thu, 2002-sep-26
Jitterbug: 2248 http://www.jtcsv.com/cgibin/icu-bugs?findid=2248

Details:

So far, I am planning to add a uconfig.h to icu/source/common/unicode/.
It will be included by utypes.h to make the switches available everywhere.
I am appending my current uconfig.h prototype at the end.

Generally, I am trying to use few coarse switches that turn off large modules,
and I will add those switches to the test suites as well so that a pared-down ICU can \
still be tested with the normal test code.

The main thrust is to cut the size of the common+i18n libraries in half for a user \
scenario that has been requested: A small ICU build for collation.

Sincerely,
markus

---- 8< uconfig.h prototype 8< ----
/**
  * This switch turns off modules that are not needed for collation.
  *
  * @draft ICU 2.4
  */
#ifndef UCONFIG_ONLY_COLLATION
#   if UCONFIG_NO_COLLATION
#       error Contradictory collation switches in uconfig.h.
#   endif
#   define UCONFIG_ONLY_COLLATION 0
#endif

#if UCONFIG_ONLY_COLLATION
#   define UCONFIG_NO_LEGACY_CONVERSION 1
#   define UCONFIG_NO_FORMATTING 1
#   define UCONFIG_NO_TRANSLITERATION 1
#   define UCONFIG_NO_BREAK_ITERATION 1
#endif

/**
  * This switch turns off collation and collation-based string search.
  *
  * @draft ICU 2.4
  */
#ifndef UCONFIG_NO_COLLATION
#   define UCONFIG_NO_COLLATION 0
#endif

/**
  * This switch turns off all converters except for
  * - Unicode charsets (UTF-7/8/16/32, CESU-8, SCSU, BOCU-1)
  * - US-ASCII
  * - ISO-8859-1
  *
  * @draft ICU 2.4
  */
#ifndef UCONFIG_NO_LEGACY_CONVERSION
#   define UCONFIG_NO_LEGACY_CONVERSION 0
#endif

/**
  * This switch turns off formatting and calendar/timezone services.
  *
  * @draft ICU 2.4
  */
#ifndef UCONFIG_NO_FORMATTING
#   define UCONFIG_NO_FORMATTING 0
#endif

/**
  * This switch turns off transliteration.
  *
  * @draft ICU 2.4
  */
#ifndef UCONFIG_NO_TRANSLITERATION
#   define UCONFIG_NO_TRANSLITERATION 0
#endif

/**
  * This switch turns off break iteration.
  *
  * @draft ICU 2.4
  */
#ifndef UCONFIG_NO_BREAK_ITERATION
#   define UCONFIG_NO_BREAK_ITERATION 0
#endif


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