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Diffstat (limited to 'docs/INSTALL')
| -rw-r--r-- | docs/INSTALL | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/docs/INSTALL b/docs/INSTALL index b44168051..c892283b2 100644 --- a/docs/INSTALL +++ b/docs/INSTALL @@ -506,13 +506,17 @@ CROSS COMPILE ./configure --host=ARCH-OS +REDUCING SIZE +============= + There are a number of configure options that can be used to reduce the size of libcurl for embedded applications where binary size is an - important factor. First, be sure to set the CFLAGS environment variable - when configuring with any compiler optimization flags to reduce the - size of the binary. For gcc, this would mean at minimum: + important factor. First, be sure to set the CFLAGS variable when + configuring with any relevant compiler optimization flags to reduce the + size of the binary. For gcc, this would mean at minimum the -Os option + and probably the -march=X option as well, e.g.: - env CFLAGS='-Os' ./configure ... + ./configure CFLAGS='-Os' ... Be sure to specify as many --disable- and --without- flags on the configure command-line as you can to disable all the libcurl features that you @@ -526,10 +530,24 @@ CROSS COMPILE --disable-crypto-auth (disables HTTP cryptographic authentication) --disable-ipv6 (disables support for IPv6) --disable-verbose (eliminates debugging strings and error code strings) + --enable-hidden-symbols (eliminates unneeded symbols in library) --without-libidn (disables support for the libidn DNS library) --without-ssl (disables support for SSL/TLS) --without-zlib (disables support for on-the-fly decompression) + The GNU linker has a number of options to reduce the size of the libcurl + dynamic libraries on some platforms even further. Specify them by giving + the options -Wl,-Bsymbolic and -Wl,-s on the gcc command-line. + Be sure also to strip debugging symbols from your binaries after + compiling using 'strip' (or the appropriate variant if cross-compiling). + If space is really tight, you may be able to remove some unneeded + sections of the library using the -R option to objcopy (e.g. the + .comment section). + + Using these techniques it is possible to create an HTTP-only shared + libcurl library for i386 Linux platforms that is less than 90 KB in + size (as of version 7.15.4). + You may find that statically linking libcurl to your application will result in a lower total size. |