small.so

berkeley db 4.6.21的源码。berkeley db是一个简单的数据库管理系统

m4_comment([$Id: small.so,v 10.11 2007/06/13 18:56:05 bostic Exp $])

m4_ref_title(Building m4_db for UNIX/POSIX systems,
    Building a small memory footprint library,,
    build_unix/conf, build_unix/flags)

m4_p([dnl
There are a set of configuration options to assist you in building a
small memory footprint library.  These configuration options turn off
specific functionality in the m4_db library, reducing the code size.
These configuration options include:])

m4_tagbegin
m4_tag([m4_idef(--disable-cryptography)], [dnl
To build m4_db without support for cryptography, enter
--disable-cryptography as an argument to configure.])

m4_tag([m4_idef(--disable-hash)], [dnl
To build m4_db without support for the Hash access method, enter
--disable-hash as an argument to configure.])

m4_tag([m4_idef(--disable-queue)], [dnl
To build m4_db without support for the Queue access method, enter
--disable-queue as an argument to configure.])

m4_tag([m4_idef(--disable-replication)], [dnl
To build m4_db without support for the database environment replication,
enter --disable-replication as an argument to configure.])

m4_tag([m4_idef(--disable-statistics)], [dnl
To build m4_db without support for the statistics interfaces, enter
--disable-statistics as an argument to configure.])

m4_tag([m4_idef(--disable-verify)], [dnl
To build m4_db without support for database verification, enter
--disable-verify as an argument to configure.])

m4_tag([m4_idef(--enable-smallbuild)], [dnl
Equivalent to individually specifying --disable-cryptography,
--disable-hash, --disable-queue, --disable-replication,
--disable-statistics and --disable-verify.  In addition, when compiling
building with the GNU gcc compiler, the --enable-smallbuild option uses
the -Os compiler build flag instead of the default -O3.])

m4_tagend

m4_p([dnl
The following configuration options will increase the size of the m4_db
library dramatically and are only useful when debugging applications:])

m4_tagbegin
m4_tag([m4_linkpage(M4RELDIR/ref/build_unix/conf,
--enable-debug, --enable-debug)], [dnl
Build m4_db with symbols for debugging.])
m4_tag([m4_linkpage(M4RELDIR/ref/build_unix/conf,
--enable-debug_rop, --enable-debug_rop)], [dnl
Build m4_db with read-operation logging.])
m4_tag([m4_linkpage(M4RELDIR/ref/build_unix/conf,
--enable-debug_wop, --enable-debug_wop)], [dnl
Build m4_db with write-operation logging.])
m4_tag([m4_linkpage(M4RELDIR/ref/build_unix/conf,
--enable-diagnostic, --enable-diagnostic)], [dnl
Build m4_db with run-time debugging checks.])
m4_tagend

m4_p([dnl
In addition, static libraries are usually smaller than shared libraries.
By default m4_db will build both shared and static libraries.  To build
only a static library, configure m4_db with the
m4_linkpage(M4RELDIR/ref/build_unix/conf, --disable-shared) option.])

m4_p([dnl
The size of the m4_db library varies depending on the compiler, machine
architecture, and configuration options.  As an estimate, production
m4_db libraries built with GNU gcc version 3.X compilers have footprints
in the range of 400KB to 900KB on 32-bit x86 architectures, and in the
range of 500KB to 1MB on 64-bit x86 architectures.])

m4_p([dnl
For assistance in further reducing the size of the m4_db library, or in
building small memory footprint libraries on other systems, please
contact m4_db support.])

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