Merge pull request !70 from Caoruihong/support_gcc

Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I021d034446f7440a7529ae2b34685752bb104763

Merge pull request !72 from Caoruihong/kconfig

Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: Ic6eb3311b66d68a3400c51617317ece07ff58a0a

Merge pull request !71 from yaoxiaoyu_903c/master

Signed-off-by: Nyaoxiaoyu <yaoxiaoyu1@huawei.com>
Change-Id: I4a7639f92ef749019fb849a3e7779a9772c4ad44

Merge pull request !69 from Caoruihong/opt_make_scripts

use redirect instead of touch to create an non-exist file
so the timestamps of it will not be changed unintentionally
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: Iab0a0251775261bf19f7ce1f569075f0a3ce1f3c

Merge pull request !67 from Caoruihong/optimize_build_scripts

Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: Ie1c166b7b4c196fd386b63d21651f774f4bb5720

Merge pull request !65 from Caoruihong/v21.02

Merge pull request !66 from Zachery Wu/zzzuo

Signed-off-by: NZachery Wu <wuzuoyu@huawei.com>
Change-Id: I420bb2c882de03a9017c104c8b5fdd7f095d6316

Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I6303a0f3d54665273e7fb7e4c2e17da803171480

Merge pull request !64 from Harylee/qemu

close #I452A7
Signed-off-by: NHaryslee <lihao189@huawei.com>
Change-Id: I4c98693485d790a3345ca6261e25161d5f70bfec

Merge pull request !63 from Caoruihong/multi_arch_uapi

Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I8e38edcba4f9a858bac6a732a7ad8260a9f9648a

Merge pull request !60 from SimonLi/master

Signed-off-by: NSimonLi <likailong@huawei.com>

Merge pull request !59 from SimonLi/master

Signed-off-by: NSimonLi <likailong@huawei.com>

Merge pull request !58 from dhy308/master

Signed-off-by: Ndhy308 <tony.gan@huawei.com>

Merge pull request !57 from Caoruihong/libc_dir

most fs.yml need this old dir structures
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: Ib2a5d230741ae1babb99078fbf0ec02810f4eaa3

Merge pull request !56 from Caoruihong/strip_libc

libc and libc++ should be stripped before packing into rootfs
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I303c03debdaa29bbefeb39e62a0ffd44764304a8

Merge pull request !55 from Harylee/mem

背景：内存调测模块编译时依赖libunwind.a库，编译时若不显式指定-lunwind链接选项对于依赖该库的程序
会编译报错。
修复：由于对链接libc.a库的所有程序添加对应的链接选项不现实，故将libunwind.a打包进libc.a，使得依
赖libunwind.a的所有程序无需显式链接unwind库即可链接成功。

close #I42O66
Signed-off-by: NHaryslee <lihao189@huawei.com>
Change-Id: I52965869e53e09e6a2596b958c63f299a3c7c8cc

Merge pull request !53 from Caoruihong/build_gn

--path is mandatory for build_ext_component target.
asmflags also need target, sysroot and arch cflags.
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: Ief0a740abfcf8be41fbcbced5d965a54490c2659

Merge pull request !52 from Caoruihong/remove_unused_files

optimize Makefile and remove unused files
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I10061f5f391422c96aa4bd041458d381d0b4a4e4

Merge pull request !51 from Caoruihong/fix_arch_cflags

when board_configed_sysroot is not empty, there is an error
raised in building saying arch_cflags not defined.
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I771d064c1a9b17c0262fc9c15bc90acbf6a9c6ae

Merge pull request !50 from Caoruihong/build_linux_out

make linux uapi headers in linux kernel dir will dirty
the linux kernel dir
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I0414342bb0f8857b1dd955a011143ab522ab599d

Merge pull request !49 from Caoruihong/PREBUILTLINUXHDRDIR

use LINUXHDRDIR instead of PREBUILTLINUXHDRDIR as inner variable for
supporting linux uapi header path passing by command line.
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I73a3f05462856168189641f1d1b3b0dabb28a3dd