11b209c5a3
Recently a build failure was reported which was traced back to to the fact
that the user had a TOOLCHAIN_VERSION environment variable set which leads
to a strange looking error message:
toolchain/toolchain/toolchain.mk:40: *** TOOLCHAIN_SITE cannot be empty when
TOOLCHAIN_SOURCE is not. Stop.
Environment variables automatically gets converted to make variables by GNU
make - E.G. from the manual
(https://www.gnu.org/software/make/manual/html_node/Environment.html):
Variables in make can come from the environment in which make is run. Every
environment variable that make sees when it starts up is transformed into a
make variable with the same name and value
So we end up in make with TOOLCHAIN_VERSION set to the value of the
environment variable. As virtual packages do not have a version, there is
no explicit TOOLCHAIN_VERSION = .. line in toolchain.mk overriding this
value, and the logic in package/pkg-generic.mk sets a default value for
TOOLCHAIN_SOURCE when TOOLCHAIN_VERSION is set, and finally errors out as
TOOLCHAIN_SITE isn't set.
As a workaround, explicitly set <pkg>_VERSION and <pkg>_SOURCE to the empty
string in the virtual package infrastructure.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit
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| boot | ||
| configs | ||
| docs | ||
| fs | ||
| linux | ||
| package | ||
| support | ||
| system | ||
| toolchain | ||
| utils | ||
| .defconfig | ||
| .flake8 | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .gitlab-ci.yml.in | ||
| CHANGES | ||
| Config.in | ||
| Config.in.legacy | ||
| COPYING | ||
| DEVELOPERS | ||
| Makefile | ||
| Makefile.legacy | ||
| README | ||
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