About minimal image

[Kang Kai <Kai.Kang@windriver.com>]

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  Hi Mark,

I have read your mail about minimal image posted on Feb 19 on this mail 
list.  We try to reduce image size by what your said:

   1. eglic configurability
   2. using mklibs


Right now after migrate eglic configurability to my local yocto branch, 
and I only enable 4 options ("locale-code nsswitch rtld-debug 
posix-clang-wchar ", pls. check in attachment) of eglibc just to make 
compile pass.

When after create minimal image, the rootfs (tar.bz2) is still about 
3.4M, same size as without adding  configurability to eglibc.

Could you give me some directions what should we do in next step? We 
also hope some information about how to use mklibs to reduce packages 
and image size?

Thanks and Regards,
Kai


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From 410f884c4bd0b2037d1df22ccdcd0bfb3c54ffdc Mon Sep 17 00:00:00 2001
From: Kang Kai <kai.kang@windriver.com>
Date: Thu, 21 Apr 2011 15:23:27 +0800
Subject: [PATCH] eglibc: migrate configurability from oe

migrate configurability from oe, try to shrink minimal image size

Signed-off-by: Kang Kai <kai.kang@windriver.com>
---
 meta/recipes-core/eglibc/eglibc-options.inc |   51 +++++++++++++++++++++++++++
 meta/recipes-core/eglibc/eglibc.inc         |   14 +++++++
 2 files changed, 65 insertions(+), 0 deletions(-)
 create mode 100644 meta/recipes-core/eglibc/eglibc-options.inc

diff --git a/meta/recipes-core/eglibc/eglibc-options.inc b/meta/recipes-core/eglibc/eglibc-options.inc
new file mode 100644
index 0000000..0af0aab
--- /dev/null
+++ b/meta/recipes-core/eglibc/eglibc-options.inc
@@ -0,0 +1,51 @@
+def eglibc_cfg(feature, features, tokens, cnf ):
+	if type(tokens) == type(""):
+		tokens = [tokens]
+	if type(features) == type([]) and feature in features:
+		cnf.extend([token + ' = y' for token in tokens])
+	else:
+		cnf.extend([token + ' = n' for token in tokens])
+
+# Map distro features to eglibc options settings
+def features_to_eglibc_settings(d):
+        cnf = ([])
+        distro_features = (bb.data.getVar('DISTRO_FEATURES_EGLIBC', d, True) or '').split() 
+        eglibc_cfg('ipv6',      distro_features, 'OPTION_EGLIBC_ADVANCED_INET6', cnf)
+        eglibc_cfg('backtrace',      distro_features, 'OPTION_EGLIBC_BACKTRACE', cnf)
+        eglibc_cfg('big-macros',      distro_features, 'OPTION_EGLIBC_BIG_MACROS', cnf)
+        eglibc_cfg('bsd',      distro_features, 'OPTION_EGLIBC_BSD', cnf)
+        eglibc_cfg('cxx-tests',      distro_features, 'OPTION_EGLIBC_CXX_TESTS', cnf)
+        eglibc_cfg('catgets',      distro_features, 'OPTION_EGLIBC_CATGETS', cnf)
+        eglibc_cfg('charsets',      distro_features, 'OPTION_EGLIBC_CHARSETS', cnf)
+        eglibc_cfg('crypt',      distro_features, 'OPTION_EGLIBC_CRYPT', cnf)
+        eglibc_cfg('crypt-ufc',      distro_features, 'OPTION_EGLIBC_CRYPT_UFC', cnf)
+        eglibc_cfg('db-aliases',      distro_features, 'OPTION_EGLIBC_DB_ALIASES', cnf)
+        eglibc_cfg('envz',      distro_features, 'OPTION_EGLIBC_ENVZ', cnf)
+        eglibc_cfg('fcvt',      distro_features, 'OPTION_EGLIBC_FCVT', cnf)
+        eglibc_cfg('fmtmsg',      distro_features, 'OPTION_EGLIBC_FMTMSG', cnf)
+        eglibc_cfg('fstab',      distro_features, 'OPTION_EGLIBC_FSTAB', cnf)
+        eglibc_cfg('ftraverse',      distro_features, 'OPTION_EGLIBC_FTRAVERSE', cnf)
+        eglibc_cfg('getlogin',      distro_features, 'OPTION_EGLIBC_GETLOGIN', cnf)
+        eglibc_cfg('idn',      distro_features, 'OPTION_EGLIBC_IDN', cnf)
+        eglibc_cfg('inet',      distro_features, 'OPTION_EGLIBC_INET', cnf)
+        eglibc_cfg('inet-anl',      distro_features, 'OPTION_EGLIBC_INET_ANL', cnf)
+        eglibc_cfg('libm',      distro_features, 'OPTION_EGLIBC_LIBM', cnf)
+        eglibc_cfg('libm-big',      distro_features, 'OPTION_EGLIBC_LIBM_BIG', cnf)
+        eglibc_cfg('locales',      distro_features, 'OPTION_EGLIBC_LOCALES', cnf)
+        eglibc_cfg('locale-code',      distro_features, 'OPTION_EGLIBC_LOCALE_CODE', cnf)
+        eglibc_cfg('memusage',      distro_features, 'OPTION_EGLIBC_MEMUSAGE', cnf)
+        eglibc_cfg('nis',      distro_features, 'OPTION_EGLIBC_NIS', cnf)
+        eglibc_cfg('nsswitch',      distro_features, 'OPTION_EGLIBC_NSSWITCH', cnf)
+        eglibc_cfg('rcmd',      distro_features, 'OPTION_EGLIBC_RCMD', cnf)
+        eglibc_cfg('rtld-debug',      distro_features, 'OPTION_EGLIBC_RTLD_DEBUG', cnf)
+        eglibc_cfg('spawn',      distro_features, 'OPTION_EGLIBC_SPAWN', cnf)
+        eglibc_cfg('streams',      distro_features, 'OPTION_EGLIBC_STREAMS', cnf)
+        eglibc_cfg('sunrpc',      distro_features, 'OPTION_EGLIBC_SUNRPC', cnf)
+        eglibc_cfg('utmp',      distro_features, 'OPTION_EGLIBC_UTMP', cnf)
+        eglibc_cfg('utmpx',      distro_features, 'OPTION_EGLIBC_UTMPX', cnf)
+        eglibc_cfg('wordexp',      distro_features, 'OPTION_EGLIBC_WORDEXP', cnf)
+        eglibc_cfg('posix-clang-wchar',      distro_features, 'OPTION_POSIX_C_LANG_WIDE_CHAR', cnf)
+        eglibc_cfg('posix-regexp',      distro_features, 'OPTION_POSIX_REGEXP', cnf)
+        eglibc_cfg('posix-regexp-glibc',      distro_features, 'OPTION_POSIX_REGEXP_GLIBC', cnf)
+        eglibc_cfg('posix-wchar-io',      distro_features, 'OPTION_POSIX_WIDE_CHAR_DEVICE_IO', cnf)
+        return "\n".join(cnf)
diff --git a/meta/recipes-core/eglibc/eglibc.inc b/meta/recipes-core/eglibc/eglibc.inc
index 8314cb1..d5016bf 100644
--- a/meta/recipes-core/eglibc/eglibc.inc
+++ b/meta/recipes-core/eglibc/eglibc.inc
@@ -28,6 +28,7 @@ DEPENDS = "virtual/${TARGET_PREFIX}gcc-intermediate linux-libc-headers"
 PROVIDES = "virtual/libc virtual/${TARGET_PREFIX}libc-for-gcc"
 PROVIDES += "virtual/libintl virtual/libiconv"
 inherit autotools
+require eglibc-options.inc
 
 LEAD_SONAME = "libc.so"
 
@@ -37,3 +38,16 @@ INHIBIT_DEFAULT_DEPS = "1"
 ARM_INSTRUCTION_SET = "arm"
 
 PACKAGES = "glibc catchsegv sln nscd ldd localedef glibc-utils glibc-dev glibc-doc glibc-locale libsegfault glibc-extra-nss glibc-thread-db glibc-pcprofile"
+
+
+DISTRO_FEATURES_EGLIBC = "locale-code nsswitch rtld-debug posix-clang-wchar "
+#DISTRO_FEATURES_EGLIBC = "ipv6 backtrace big-macros bsd cxx-tests catgets charsets \
+#                          crypt crypt-ufc db-aliases envz fcvt fmtmsg fstab ftraverse \
+#                          getlogin idn inet inet-anl libm libm-big locales locale-code \
+#                          memusage nis nsswitch rcmd rtld-debug spawn streams sunrpc utmp \
+#                          utmpx wordexp posix-clang-wchar posix-regexp posix-regexp-glibc posix-wchar-io \
+#                          "
+OE_FEATURES := "${@features_to_eglibc_settings(d)}"
+do_configure_prepend() {
+	echo '${OE_FEATURES}' > ${B}/option-groups.config
+}
-- 
1.7.1