问题1：
<command-line>:0:0:warning:”_FORTIFY_SOURCE” redefined [enabled by default]
<built-in>:0:0:note: this is the location of theprevious definition
hostExecutable:mksnapshot(out/host/linux-x86/obj/EXECUTABLES/mksnapshot_intermediates/mksnapshot)
true
Install:out/host/linux-x86/bin/mksnapshot
Install:out/host/linux-x86/bin/mkyaffs2image
host C++:obbtool <=frameworks/base/tools/obbtool/Main.cpp
<command-line>:0:0:error: “_FORTIFY_SOURCE”redefined [-Werror]
<built-in>:0:0:note: this is the location of theprevious definition
cc1plus:all warnings being treated as errors
make:***[out/host/linux-x86/obj/EXECUTABLES/obbtool_intermediates/Main.o] Error 1
icscompile fail!