Android源码下载和编译Tips

1. Download a specific version:

repo init -u git://android.git.kernel.org/platform/manifest.git -b android-2.3.4_r1

repo init -u git://android.git.kernel.org/platform/manifest.git -b froyo

2. Download protocol:

You can use both the the git:// or the http:// and even there is a possibility to set the $GIT_SSH (man git for more information).

After repo inited, for "repo sync", we can change the download protocol by modifying .repo/manifest.xml

3. 遇到错误：

build/core/base_rules.mk:78: *** Module name: jsilver
build/core/base_rules.mk:79: *** Makefile location: external/jsilver
build/core/base_rules.mk:80: *
build/core/base_rules.mk:81: * Each module must use a LOCAL_MODULE_TAGS in its
build/core/base_rules.mk:82: * Android.mk. Possible tags declared by a module:
build/core/base_rules.mk:83: *
build/core/base_rules.mk:84: *     optional, debug, eng, tests, samples
build/core/base_rules.mk:85: *
build/core/base_rules.mk:86: * If the module is expected to be in all builds
build/core/base_rules.mk:87: * of a product, then it should use the
build/core/base_rules.mk:88: * "optional" tag:
build/core/base_rules.mk:89: *
build/core/base_rules.mk:90: *    Add "LOCAL_MODULE_TAGS := optional" in the
build/core/base_rules.mk:91: *    Android.mk for the affected module, and add
build/core/base_rules.mk:92: *    the LOCAL_MODULE value for that component
build/core/base_rules.mk:93: *    into the PRODUCT_PACKAGES section of product
build/core/base_rules.mk:94: *    makefile(s) where it's necessary, if
build/core/base_rules.mk:95: *    appropriate.
build/core/base_rules.mk:96: *
build/core/base_rules.mk:97: * If the component should be in EVERY build of ALL
build/core/base_rules.mk:98: * products, then add its LOCAL_MODULE value to the
build/core/base_rules.mk:99: * PRODUCT_PACKAGES section of
build/core/base_rules.mk:100: * build/target/product/core.mk
build/core/base_rules.mk:101: *
build/core/base_rules.mk:102: *** user tag detected on new module - user tags are only supported on legacy modules.  Stop.

This is due to the declaration of LOCAL_MODULE_TAGS. To fix it just follow the instructions that suggest including the optional tag. Thanks to [10] for the command line that replace user tag by optional tag on every affected file.

用这个命令行将所有user改成optional即可：

find ./ -exec grep -l "LOCAL_MODULE_TAGS := user" {} \; -exec sed -i.bak s/"LOCAL_MODULE_TAGS := user"/"LOCAL_MODULE_TAGS := optional"/g {} \;