CODEWITHSUNDEEP
androidlinuxbuildmakefile
MemoryLeak
MemoryLeak

Reputation: 7318

can someone explain to me this command (make ARCH)?

make ARCH=arm msm_defconfig
make ARCH=arm CROSS_COMPILE=$SOURCE_FOLDER/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/arm-eabi- zImage -j4

I would like to build android kernel, and I did find some tutorial on that. and I found the command above, I want to know how this command work? So if someone can explain it or give me some references on this, that will be better.

Thanks in advance !

Upvotes: 0

Views: 11785

Answers (2)

wkl
wkl

Reputation: 79921

make ARCH=arm will specify that this is an intended build for the ARM architecture since you are cross-compiling on a non-ARM system. CROSS_COMPILE is specifying the name to append to tools so that the correct tools are used to generate your resulting object files and binaries.

ARCH=arm is actually a local environment variable (for lack of the official term) - you could have set it as an environment variable. Same thing with CROSS_COMPILE

export ARCH=arm
export CROSS_COMPILE="..."
make -j4 zImage

Though if you did that, you might affect your environment for all make commands executed.

edit The only resource that seemed useful in explaining those two flags to any extent, as everyone else basically says to copy what they do without fully explaining it: http://book.opensourceproject.org.cn/embedded/oreillybuildembed/opensource/belinuxsys-chp-5-sect-3.html

Upvotes: 2

Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams

Reputation: 798686

Parameters to make with a = are converted to variables within the makefile. -j tells make to run multiple parallel processes to handle the build. The remaining argument is the build target. See both Makefile in the current directory as well as the GNU make documentation for more details.

Upvotes: 1

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