Call shell commands in Android. mk

In the past few days, when writing Android. mk, sometimes I always want to print some variables or something. If ECHO is not available, I can find a way to access the Internet.

Finally, I found such an article quite well.

Address: http://blog.csdn.net/michaelpp/article/details/6249989

There are many examples in the android compilation script, such as in the build/CORE/Main. mk file:

 

Ifeq ($ (build_ OS), Linux)

Build_arch: = $ (shell uname-m)

Ifneq (64, $ (findstring 64, $ (build_arch )))

$ (Warning ************************************* ***********************)

$ (Warning you are attempting to build on a 32-bit system .)

$ (Warning only 64-bit build environments are supported beyond froyo/2.2 .)

$ (Warning ************************************* ***********************)

$ (Error stop)

Endif

Endif

 

Ifneq ($ (host_ OS), Windows)

Ifneq ($ (host_ OS)-$ (host_arch), Darwin-PPC)

# Check for a Case Sensitive File System

Ifneq (A, $ (shell mkdir-p $ (out_dir );/

Echo A> $ (out_dir)/casecheck.txt ;/

Echo B> $ (out_dir)/casecheck.txt ;/

Cat $ (out_dir)/casecheck.txt ))

$ (Warning ************************************* ***********************)

$ (Warning you are building on a case-insensitive filesystem .)

$ (Warning please move your source tree to a case-sensitive filesystem .)

$ (Warning ************************************* ***********************)

$ (Error case-insensitive filesystems not supported)

Endif

Endif

Endif

 In this way, you can print any variable or call any other command.