help: makefile how to let it locate c compiler in a relative path?

lxpwj · 09-11-2009, 01:03 AM

hello, all,

I have set up a embedded SW project for ARM.
I have my ARM cross-compile tools ready, and the folder structure is like this

--arm compiler-
|[ ][ ][ ][ ][ ]--bin
--linunx kernel
|
|my code--
[][ ][ ][ ]|- folder 1
[][ ][ ][ ]|- folode 2

my makefile will be in folder1, folder2 and my code. How can I let CC point to arm compiler/bin path
I hope that this project can move to any folder and is not sticked to absolute path?
can you suggest it? thank you.

Sergei Steshenko · 09-11-2009, 06:51 PM

Quote:

Originally Posted by lxpwj

hello, all,

I have set up a embedded SW project for ARM.
I have my ARM cross-compile tools ready, and the folder structure is like this

--arm compiler-
|[ ][ ][ ][ ][ ]--bin
--linunx kernel
|
|my code--
[][ ][ ][ ]|- folder 1
[][ ][ ][ ]|- folode 2

my makefile will be in folder1, folder2 and my code. How can I let CC point to arm compiler/bin path
I hope that this project can move to any folder and is not sticked to absolute path?
can you suggest it? thank you.

I am not a 'make' guru, but your question boils down to "how can assign a value to a variable in Makefile during execution" - which you can (and, I again, I do not remember off the top of my head).

So, at the moment you know the answer to the above, the backticks operator (i.e. `some command`) is your friend.

...

CC may also be an environment variable if it's of any help.

knudfl · 09-11-2009, 07:35 PM

Examples , using cross tools :

export LD_LIBRARY_PATH=/<path-to-cross-compiled-dependecy>/lib
.....

<path-to-cross>/arm-gcc <flags> code.c ......
.....

./configure CC="<path-to-armgcc> -L/<path-to-arm-tools>/lib/"
or
./configure \
CC="<path-to-armgcc> -L/<path-to-arm-/lib>/ -L/<path-to-other-cross-compiled-libs>/lib/"

.. and / or ..
make CC="<path-to-armgcc> -L/<path-to-arm-tools>/lib/"

Similar for includes ( headers) : -I/<path>
.....
Checking all path's : env | grep PATH
.....

lxpwj · 09-25-2009, 03:02 AM

thanks a lot

lutusp · 09-25-2009, 03:38 AM

Quote:

Originally Posted by lxpwj

hello, all,

I have set up a embedded SW project for ARM.
I have my ARM cross-compile tools ready, and the folder structure is like this

--arm compiler-
|[ ][ ][ ][ ][ ]--bin
--linunx kernel
|
|my code--
[][ ][ ][ ]|- folder 1
[][ ][ ][ ]|- folode 2

my makefile will be in folder1, folder2 and my code. How can I let CC point to arm compiler/bin path
I hope that this project can move to any folder and is not sticked to absolute path?
can you suggest it? thank you.

Code:

$ make CC=(path to compiler)