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Yann E. MORIN 83f71e7ceb Makefile: fix show-vars for good this time 
Commit 5c54c3ef3d (Makefile: workaround make 4.3 issue for 'printvars
and 'show-vars') did not fully fix the show-vars case, which still
segfaults.

Overall, show-vars generates a JSON blurb. That is supposed to be
machine-readable, so we do not care that the variables are sorted, so
we get rid of it to (slightly) simplify the code.

Then, we currently iterate twice on the list of variables: the first one
to filter-out the 'internal' variables, and the second one to filter
only the variables matching the pattern. We can do away by iterating
only once, and applying both filters at once.

Since we now have an 'and' condition, we can take advantage of it: when
none of the items in $(and) are empty, $(and) evaluates to the last
item, while it evaluates to empty if any of the items is empty. So we
can coalesce the $(if) and $(and) together: $(if $(and a,b),c) is
equivalent to: $(and a,b,c) ; this gains us one parentheses depth.

Finally, the cause for the segfault is an overly-long call to $(info).
Reducing that is not easy: we want to call clean-json on the whole of
the JSON blurb, so we can't emit the individual variables one by one, or
the trailing comma would not be trimmed away.

So, we go crazy: we just output each word from clean-json with $(info).

We can do that, because mk-json-str transforms all spaces in a string
to an escaped UTF-8 sequence, so we will never have spaces in values;
the keys are the variables, so they won't have spaces either; spaces in
the rest of the JSON blurb are totally optional, so we don't care how
many there are. We know there are spaces, because we explicitly
introduce some (after "expanded" or "raw", for example), so we should
never hit a too-big word for $(info) to print.

Thanks to Henri for the suggestion to push $(info) further inside the
macro.

Reported-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Roosen Henri <Henri.Roosen@ginzinger.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Tested-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2022-08-03 18:37:42 +02:00
arch arch/csky: drop architecture 2022-07-27 16:58:59 +02:00
board configs/imx8mpico: bump bsp components to version tn-hardknott_5.10.72-2.2.0 2022-08-01 23:06:48 +02:00
boot boot/arm-trusted-firmware: set CFLAGS from environment, not override 2022-07-30 17:02:02 +02:00
configs configs/imx8mpico: bump bsp components to version tn-hardknott_5.10.72-2.2.0 2022-08-01 23:06:48 +02:00
docs docs/manual/ccache-support.txt: document the new BR2_USE_CCACHE variable 2022-07-30 13:45:16 +02:00
fs fs/tar: add option for zstd compression 2022-07-23 22:40:01 +02:00
linux arch: add support for configurable page size on ARM64 2022-07-26 22:54:39 +02:00
package package/python-scipy: fix scipy::io module runtime dependency 2022-08-03 18:35:40 +02:00
support support/testing/tests/test_python_scipy: add scipy::io module testing 2022-08-03 18:35:54 +02:00
system package/systemd: add setting for systemd default.target 2022-05-02 22:58:44 +02:00
toolchain toolchain/Config.in: improve gcc bug 43744 condition 2022-07-30 17:43:40 +02:00
utils utils/readme.txt: Fix typo "get-developers" 2022-07-23 18:21:21 +02:00
.clang-format .clang-format: initial import from Linux 5.15.6 2022-01-01 15:01:13 +01:00
.defconfig arch: remove support for sh64 2016-09-08 22:15:15 +02:00
.flake8 Revert ".flake8: fix check for 80/132 columns" 2021-01-02 17:38:20 +01:00
.gitignore
.gitlab-ci.yml utils/checkpackagelib/lib_sysv: run shellcheck 2022-02-06 18:27:03 +01:00
.shellcheckrc utils/check-package: improve shellcheck reproducibility 2022-07-25 23:52:47 +02:00
CHANGES Update for 2022.02.4 2022-07-29 12:00:57 +02:00
Config.in Config.in: move toolchain menu before build options 2022-07-27 11:11:19 +02:00
Config.in.legacy Makefile, docs/manual, support, toolchain: remove Eclipse integration 2022-07-30 12:32:41 +02:00
COPYING
DEVELOPERS package/python-rtoml: new package 2022-08-02 23:19:08 +02:00
Makefile Makefile: fix show-vars for good this time 2022-08-03 18:37:42 +02:00
Makefile.legacy Remove BR2_DEPRECATED 2016-10-15 23:14:45 +02:00
README docs: move the IRC channel away from Freenode 2021-05-29 22:16:23 +02:00

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 OFTC IRC.

If you would like to contribute patches, please read
https://buildroot.org/manual.html#submitting-patches