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... also drop comment about hacking.txt being extended gradually. AsciiDoc burps on it and it really is kind of a boot message.
93 lines
3.7 KiB
Plaintext
93 lines
3.7 KiB
Plaintext
Tips to obtain a very small static elinks binary
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Tips to obtain a very small static elinks binary suitable for mini
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distributions
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Remove config.cache (previous CC may be cached):
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$ rm config.cache
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Use dietlibc (http://www.fefe.de/dietlibc/) or similar stuff (uClibc, ...):
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$ export CC='diet -Os gcc'
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Use compilers flags to optimize for size:
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$ export CFLAGS='-s -fno-inline -nostdinc -fomit-frame-pointer'
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Note that if you don't use dietlibc, you definitively want to add `-Os` or
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`-O2` to `CFLAGS`; GCC 2.95 does not know `-Os`, and some say `-O2` gives
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smaller executables even for GCC 3.x.
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[NOTE]
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.Warning
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===============================================================================
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If you use these `CFLAGS` on Cygwin and you get unresolved symbols (`htons` and
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suite in particular), try removing `-fno-inline` parameter.
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===============================================================================
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Disable some compile-time options:
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------------------------------------------------------------------------------
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$ ./configure --disable-ipv6 --disable-backtrace --disable-nls \
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--enable-fastmem --without-zlib --without-bzlib --disable-xbel \
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--without-lua --without-gnutls --without-openssl --without-x \
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--enable-small --without-spidermonkey --without-gpm
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------------------------------------------------------------------------------
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You can disable bookmarks, globhist and more, too, if you want to.
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[NOTE]
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.Notes
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===============================================================================
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- --disable-backtrace disables internal backtrace code.
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- --disable-nls disables i18n support.
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- --enable-fastmem disables internal `malloc()` debugging and use `alloca()`
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wherever possible.
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- --enable-small forces to remove some text descriptions in options and
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keybind stuff (regain 30Kb).
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===============================================================================
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Dependencies over external libs must be removed using the related configure
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options:
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`-----------------------`------------------------------------------------------
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Option Description
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-------------------------------------------------------------------------------
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--without-zlib removes libz dependency (compression)
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--without-bzlib removes libbz2 dependency (compression)
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--disable-xbel removes expat dependency (XBEL bookmarks support)
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--without-lua removes liblua dependency (Lua scripting)
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--without-gnutls removes libtls dependency (SSL support)
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--without-openssl removes libssl dependency (SSL support)
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--without-x removes libx11 dependency (restoring terminal title)
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--without-spidermonkey removes libjs dependency (JavaScript)
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--without-gpm removes libgpm dependency (mouse/console)
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-------------------------------------------------------------------------------
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It seems GCC 2.95.x do not generate as small binaries as GCC 3.2.x with same
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flags.
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You can use an executable compressor like UPX
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link:http://upx.sourceforge.net/[].
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Here are some results using gcc 2.95.3, dietlibc-0.23, and previous flags:
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me$ ls -l src/elinks
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-rwxr-xr-x 1 zas users 495100 Oct 20 15:53 src/elinks
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me$ upx --best src/elinks
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me$ ls -l src/elinks
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-rwxr-xr-x 1 zas users 217946 Oct 20 15:53 src/elinks
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Whow ! Around 200kb :)
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[NOTE]
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.Details about the `--enable-small` configure option effects:
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==============================================================================
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- it disables long descriptions of options;
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- it disables textual descriptions of keybinding options;
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- it reduces size of some HTTP errors messages;
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- it disables fastfind feature, reducing performance, but also reducing a lot
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memory usage, and a bit the executable size.
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==============================================================================
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