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Yann E. MORIN b574a9606e package/erlang: do not hard-code the Erlang Interface Version (EI_VSN) 
The note above the erlang version instructs to refer to another note
further down the file. However, even if it is not too difficult to find,
it is still located a bit too far away, and the reference is not very
explicit what note we should look at.

When we introduced that variable in 6c1d128844 (package/erlang: export
EI_VSN so other packages can use it), the rationale for hard-coding it
was "to avoid spawning a shell every time the variable is dereferenced".

However, that can get a bit confusing and hard to follow. Also, that in
fact spawns a shell only once for each rebar-packages, so the overhead
is far from being too high.

The EI_VSN is only used by rebar-package packages, is derefrenced from
the rebar-infra and not the packages themselves, and is not needed by
erlang itself (it knows its own EI_VSN), so we can de-hard-code it, and
rely on build-time detection, by looking in the appropriate file.

We have two files where we could look:
  - lib/erl_interface/vsn.mk in the erlang source tree, but it is not
    installed,
  - .../lib/erlang/releases/$(ERLANG_RELASE)/installed_application_versions
    as installed by erlang.

We use the second one, as it is cleaner, for a package, to look into
installed files, rather than to look in the source tree of another
package.

Although both the host and target erlang are the same, we still look
into the corresponding file to extract the version. This is so that it
would be easier if in the future we ever manage to rely on a
system-installed erlang that could have a EI_VSN different from the
target one.

We can't re-use the variable ERLANG_EI_VSN, because it now needs to be
$(call)-ed with a parameter. Hopefully, external packages that use it
directly rather than through the rebar infra, are not legion...

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Will Newton <will.newton@gmail.com>
Cc: Johan Oudinet <johan.oudinet@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2023-08-10 23:07:06 +02:00
arch arch/mips: re-add support for MIPS IV 2023-08-10 22:39:10 +02:00
board board/intel/galileo: enable Linux kernel root file system on NFS 2023-08-10 23:01:49 +02:00
boot boot/uboot: add host-python-pylibfdt dependency if needed 2023-08-08 21:54:41 +02:00
configs configs/orangepi_pc2: new defconfig 2023-08-09 23:30:12 +02:00
docs support/download: add support to exclude svn externals 2023-08-06 16:35:52 +02:00
fs fs/cpio: allow users to provide their own dracut modules 2023-02-06 22:46:35 +01:00
linux {linux, linux-headers}: bump 5.{4, 10, 15}.x / 6.{1, 4}.x series 2023-07-27 23:36:31 +02:00
package package/erlang: do not hard-code the Erlang Interface Version (EI_VSN) 2023-08-10 23:07:06 +02:00
support support/testing/tests/package/test_kmscube: new runtime test 2023-08-10 21:48:32 +02:00
system package/systemd: bump linux-headers dependency to 4.14 2023-08-02 21:18:16 +02:00
toolchain toolchain/toolchain-external/toolchain-external-custom: add gcc 13 version selection 2023-07-28 22:04:49 +02:00
utils utils/docker-run: fix running when CWD is not MAIN_DIR 2023-07-31 20:56:57 +02:00
.checkpackageignore board/versal: clean shellcheck issues 2023-08-08 00:06:56 +02:00
.clang-format .clang-format: initial import from Linux 5.15.6 2022-01-01 15:01:13 +01:00
.defconfig
.flake8
.gitignore
.gitlab-ci.yml .gitlab-ci.yml: update Docker image to use 2023-02-07 18:15:00 +01:00
.shellcheckrc utils/check-package: improve shellcheck reproducibility 2022-07-25 23:52:47 +02:00
CHANGES Update for 2023.08-rc1 2023-08-05 23:03:28 +02:00
Config.in package/sam-ba: drop 32bit host lib requirement 2023-07-30 23:41:44 +02:00
Config.in.legacy package/google-material-design-icons: drop package 2023-08-09 20:37:28 +02:00
COPYING
DEVELOPERS support/testing/tests/package/test_kmscube: new runtime test 2023-08-10 21:48:32 +02:00
Makefile support/scripts/fix-rpath: parallelize patching files 2023-08-06 23:27:31 +02:00
Makefile.legacy
README

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
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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