I have many build scripts to compile, can I use single variable to pass CFLAGS info

[tvnaidu]

Currently I have 15 module folders, each module had C code, also Makefile in each folder, also build script to create shared lib for each module. Each of this Makefile had CFLAGS defined inside, basically -g option enabled in all Makefile, there is a separate line ion each Makefile for CFLAGS, but at the root, I have single build_all script which calls each build script to compile each module and create each shared lib. can I pass this CFLAGS info from top, to bottom to all the scripts, this way I can have define CFLAGS at one placem this way I can control -g option, any idea how can I do that?.

each Makefile had line like this, I want to define this CFLAGS at once instead in each Makefile and propage this from top when I call "build_all" to create all.

CFLAGS= -Wall -g -O2

[Banfa]

Just put the flags definition on the command line instead of in the make file

make "CFLAGS= -Wall -g -O2"

[tvnaidu]

Thanks.
I have to pass CFLAGS like this for 15 Makefiles, instead can I export at at one place like below, this way I can have CFLAGS defined at one place, later when I compile for production, I can takeout -g option at one place instead 15 places for 15 Makefiles. I can do like this inside build script?.

export CFLAGS="-Wall -g -O2"
cd util
make $CFLAGS
cd trace
make $CFLAGS

[Banfa]

Yes .