安卓编译1：envsetup.sh

build/make/envsetup.sh

function hmm() {
cat <<EOF

Run "m help" for help with the build system itself.

Invoke ". build/envsetup.sh" from your shell to add the following functions to your environment:
- lunch:      lunch <product_name>-<build_variant>
              Selects <product_name> as the product to build, and <build_variant> as the variant to
              build, and stores those selections in the environment to be read by subsequent
              invocations of 'm' etc.
- tapas:      tapas [<App1> <App2> ...] [arm|x86|mips|arm64|x86_64|mips64] [eng|userdebug|user]
- croot:      Changes directory to the top of the tree, or a subdirectory thereof.
- m:          Makes from the top of the tree.
- mm:         Builds and installs all of the modules in the current directory, and their
              dependencies.
- mmm:        Builds and installs all of the modules in the supplied directories, and their
              dependencies.
              To limit the modules being built use the syntax: mmm dir/:target1,target2.
- mma:        Same as 'mm'
- mmma:       Same as 'mmm'
- provision:  Flash device with all required partitions. Options will be passed on to fastboot.
- cgrep:      Greps on all local C/C++ files.
- ggrep:      Greps on all local Gradle files.
- gogrep:     Greps on all local Go files.
- jgrep:      Greps on all local Java files.
- resgrep:    Greps on all local res/*.xml files.
- mangrep:    Greps on all local AndroidManifest.xml files.
- mgrep:      Greps on all local Makefiles and *.bp files.
- owngrep:    Greps on all local OWNERS files.
- sepgrep:    Greps on all local sepolicy files.
- sgrep:      Greps on all local source files.
- godir:      Go to the directory containing a file.
- allmod:     List all modules.
- gomod:      Go to the directory containing a module.
- pathmod:    Get the directory containing a module.
- refreshmod: Refresh list of modules for allmod/gomod.

Environment options:
- SANITIZE_HOST: Set to 'address' to use ASAN for all host modules.
- ANDROID_QUIET_BUILD: set to 'true' to display only the essential messages.

Look at the source to view more functions. The complete list is:
EOF
    local T=$(gettop)
    local A=""
    local i
    for i in `cat $T/build/envsetup.sh | sed -n "/^[[:blank:]]*function /s/function \([a-z_]*\).*/\1/p" | sort | uniq`; do
      A="$A $i"
    done
    echo $A
}

以上看起来很费劲，总体的功能为打印所有的脚本的函数名称。

sed实例分析_自己解决的博客-优快云博客

`cat $T/build/envsetup.sh | sed -n “/^[[:blank:]]*function /s/function \([a-z_]*\).*/\1/p“ | sort |_自己解决的博客-优快云博客

# Get all the build variables needed by this script in a single call to the build system.
function build_build_var_cache()
{
    local T=$(gettop)
    # Grep out the variable names from the script.
    cached_vars=(`cat $T/build/envsetup.sh | tr '()' '  ' | awk '{for(i=1;i<=NF;i++) if($i~/get_build_var/) print $(i+1)}' | sort -u | tr '\n' ' '`)
    cached_abs_vars=(`cat $T/build/envsetup.sh | tr '()' '  ' | awk '{for(i=1;i<=NF;i++) if($i~/get_abs_build_var/) print $(i+1)}' | sort -u | tr '\n' ' '`)
    # Call the build system to dump the "<val>=<value>" pairs as a shell script.
    build_dicts_script=`\builtin cd $T; build/soong/soong_ui.bash --dumpvars-mode \
                        --vars="${cached_vars[*]}" \
                        --abs-vars="${cached_abs_vars[*]}" \
                        --var-prefix=var_cache_ \
                        --abs-var-prefix=abs_var_cache_`
    local ret=$?
    if [ $ret -ne 0 ]
    then
        unset build_dicts_script
        return $ret
    fi
    # Execute the script to store the "<val>=<value>" pairs as shell variables.
    eval "$build_dicts_script"
    ret=$?
    unset build_dicts_script
    if [ $ret -ne 0 ]
    then
        return $ret
    fi
    BUILD_VAR_CACHE_READY="true"
}

# Delete the build var cache, so that we can still call into the build system
# to get build variables not listed in this script.
function destroy_build_var_cache()
{
    unset BUILD_VAR_CACHE_READY
    local v
    for v in $cached_vars; do
      unset var_cache_$v
    done
    unset cached_vars
    for v in $cached_abs_vars; do
      unset abs_var_cache_$v
    done
    unset cached_abs_vars
}

# Get the value of a build variable as an absolute path.
function get_abs_build_var()
{
    if [ "$BUILD_VAR_CACHE_READY" = "true" ]
    then
        eval "echo \"\${abs_var_cache_$1}\""
    return
    fi

    local T=$(gettop)
    if [ ! "$T" ]; then
        echo "Couldn't locate the top of the tree.  Try setting TOP." >&2
        return
    fi
    (\cd $T; build/soong/soong_ui.bash --dumpvar-mode --abs $1)
}

# Get the exact value of a build variable.
function get_build_var()
{
    if [ "$BUILD_VAR_CACHE_READY" = "true" ]
    then
        eval "echo \"\${var_cache_$1}\""
    return
    fi

    local T=$(gettop)
    if [ ! "$T" ]; then
        echo "Couldn't locate the top of the tree.  Try setting TOP." >&2
        return
    fi
    (\cd $T; build/soong/soong_ui.bash --dumpvar-mode $1)
}

# check to see if the supplied product is one we can build
function check_product()
{
    local T=$(gettop)
    if [ ! "$T" ]; then
        echo "Couldn't locate the top of the tree.  Try setting TOP." >&2
        return
    fi
        TARGET_PRODUCT=$1 \
        TARGET_BUILD_VARIANT= \
        TARGET_BUILD_TYPE= \
        TARGET_BUILD_APPS= \
        get_build_var TARGET_DEVICE > /dev/null
    # hide successful answers, but allow the errors to show
}

VARIANT_CHOICES=(user userdebug eng)

# check to see if the supplied variant is valid
function check_variant()
{
    local v
    for v in ${VARIANT_CHOICES[@]}
    do
        if [ "$v" = "$1" ]
        then
            return 0
        fi
    done
    return 1
}

function setpaths()
{
    local T=$(gettop)
    if [ ! "$T" ]; then
        echo "Couldn't locate the top of the tree.  Try setting TOP."
        return
    fi

    ##################################################################
    #                                                                #
    #              Read me before you modify this code               #
    #                                                                #
    #   This function sets ANDROID_BUILD_PATHS to what it is adding  #
    #   to PATH, and the next time it is run, it removes that from   #
    #   PATH.  This is required so lunch can be run more than once   #
    #   and still have working paths.                                #
    #                                                                #
    ##################################################################

    # Note: on windows/cygwin, ANDROID_BUILD_PATHS will contain spaces
    # due to "C:\Program Files" being in the path.

    # out with the old
    if [ -n "$ANDROID_BUILD_PATHS" ] ; then
        export PATH=${PATH/$ANDROID_BUILD_PATHS/}
    fi
    if [ -n "$ANDROID_PRE_BUILD_PATHS" ] ; then
        export PATH=${PATH/$ANDROID_PRE_BUILD_PATHS/}
        # strip leading ':', if any
        export PATH=${PATH/:%/}
    fi

    # and in with the new
    local prebuiltdir=$(getprebuilt)
    local gccprebuiltdir=$(get_abs_build_var ANDROID_GCC_PREBUILTS)

    # defined in core/config.mk
    local targetgccversion=$(get_build_var TARGET_GCC_VERSION)
    local targetgccversion2=$(get_build_var 2ND_TARGET_GCC_VERSION)
    export TARGET_GCC_VERSION=$targetgccversion

    # The gcc toolchain does not exists for windows/cygwin. In this case, do not reference it.
    export ANDROID_TOOLCHAIN=
    export ANDROID_TOOLCHAIN_2ND_ARCH=
    local ARCH=$(get_build_var TARGET_ARCH)
    local toolchaindir toolchaindir2=
    case $ARCH in
        x86) toolchaindir=x86/x86_64-linux-android-$targetgccversion/bin
            ;;
        x86_64) toolchaindir=x86/x86_64-linux-android-$targetgccversion/bin
            ;;
        arm) toolchaindir=arm/arm-linux-androideabi-$targetgccversion/bin
            ;;
        arm64) toolchaindir=aarch64/aarch64-linux-android-$targetgccversion/bin;
               toolchaindir2=arm/arm-linux-androideabi-$targetgccversion2/bin
            ;;
        mips|mips64) toolchaindir=mips/mips64el-linux-android-$targetgccversion/bin
            ;;
        *)
            echo "Can't find toolchain for unknown architecture: $ARCH"
            toolchaindir=xxxxxxxxx
            ;;
    esac
    if [ -d "$gccprebuiltdir/$toolchaindir" ]; then
        export ANDROID_TOOLCHAIN=$gccprebuiltdir/$toolchaindir
    fi

    if [ "$toolchaindir2" -a -d "$gccprebuiltdir/$toolchaindir2" ]; then
        export ANDROID_TOOLCHAIN_2ND_ARCH=$gccprebuiltdir/$toolchaindir2
    fi

    export ANDROID_DEV_SCRIPTS=$T/development/scripts:$T/prebuilts/devtools/tools:$T/external/selinux/prebuilts/bin

    # add kernel specific binaries
    case $(uname -s) in
        Linux)
            export ANDROID_DEV_SCRIPTS=$ANDROID_DEV_SCRIPTS:$T/prebuilts/misc/linux-x86/dtc:$T/prebuilts/misc/linux-x86/libufdt
            ;;
        *)
            ;;
    esac

    ANDROID_BUILD_PATHS=$(get_build_var ANDROID_BUILD_PATHS):$ANDROID_TOOLCHAIN
    if [ -n "$ANDROID_TOOLCHAIN_2ND_ARCH" ]; then
        ANDROID_BUILD_PATHS=$ANDROID_BUILD_PATHS:$ANDROID_TOOLCHAIN_2ND_ARCH
    fi
    ANDROID_BUILD_PATHS=$ANDROID_BUILD_PATHS:$ANDROID_DEV_SCRIPTS

    # Append llvm binutils prebuilts path to ANDROID_BUILD_PATHS.
    local ANDROID_LLVM_BINUTILS=$(get_abs_build_var ANDROID_CLANG_PREBUILTS)/llvm-binutils-stable
    ANDROID_BUILD_PATHS=$ANDROID_BUILD_PATHS:$ANDROID_LLVM_BINUTILS

    # Set up ASAN_SYMBOLIZER_PATH for SANITIZE_HOST=address builds.
    export ASAN_SYMBOLIZER_PATH=$ANDROID_LLVM_BINUTILS/llvm-symbolizer

    # If prebuilts/android-emulator/<system>/ exists, prepend it to our PATH
    # to ensure that the corresponding 'emulator' binaries are used.
    case $(uname -s) in
        Darwin)
            ANDROID_EMULATOR_PREBUILTS=$T/prebuilts/android-emulator/darwin-x86_64
            ;;
        Linux)
            ANDROID_EMULATOR_PREBUILTS=$T/prebuilts/android-emulator/linux-x86_64
            ;;
        *)
        &n