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For the general case, appending values to variables is OK and also a good practice, like this: |PACKAGE_VAR = value1 |ifeq ... |PACKAGE_VAR += value2 or this, when the above is not possible: |PACKAGE_VAR = value1 |ifeq ... |PACKAGE_VAR := $(PACKAGE_VAR), value2 But this override is an error: |PACKAGE_VAR = value1 |PACKAGE_VAR = value2 as well this one: |ifeq ... |PACKAGE_VAR += value1 |endif |PACKAGE_VAR = value2 And this override is error-prone: |PACKAGE_VAR = value1 |ifeq ... |PACKAGE_VAR = value2 Create a check function to warn about overridden variables. Some variables are likely to have a default value that gets overridden in a conditional, so ignore them. The name of such variables end in _ARCH, _CPU, _SITE, _SOURCE or _VERSION. After ignoring these variable names, there are a few exceptions to this rule in the tree. For them use the comment that disables the check. Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com> Cc: Simon Dawson <spdawson@gmail.com> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Tested-by: Titouan Christophe <titouan.christophe@railnova.eu> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches