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core: allow br2-external trees to provide pre-configured toolchains

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Since we have a choice for the pre-configured pre-built toolchains,
there is no possbility for a br2-external to provide its own. The
only solution so far for defconfigs in br2-external trees is to use
BR2_TOOLCHAIN_EXTERNAL_CUSTOM and define all the bits by itself...

This is not so convemient, so offer a way for br2-external trees to
provide such pre-configured toolchains.

To allow for this, we now scan each br2-external tree and look for a
specific file, provides.toolchains.in. We generate a kconfig file that
sources each such file, and that generated file is sourced from within
the toolchain choice, thus making the toolchains from a br2-external
tree possible and available in the same location as the ones known to
Buildroot:

    Toolchain  --->
        Toolchain type (External toolchain)  --->
        Toolchain  --->
            (X) Arm ARM 2019.03
            ( ) Linaro ARM 2018.05
            ( ) Custom toolchain
                *** Toolchains from my-br2-ext-tree: ***
            ( ) My custom ARM toolchain
                *** Toolchains from another-br2-ext-tree: ***
            ( ) Another custom ARM toolchain
            ( ) A third custom ARM toolchain

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Yann E. MORIN
2019-07-29 22:20:00 +02:00
committed by Peter Korsgaard
parent edf32b021c
commit fa037acee0
2 changed files with 13 additions and 1 deletions
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9
support/scripts/br2-external
View File

@@ -157,6 +157,7 @@ do_kconfig() {
items=(
paths
menus
toolchains
)
for br2 in "${items[@]}"; do
@@ -196,6 +197,14 @@ do_kconfig() {
fi
printf '\n'
} >>"${outputdir}/.br2-external.in.menus"
if [ -f "${br2_ext}/provides/toolchains.in" ]; then
printf 'comment "Toolchains from: %s"\n' "${br2_desc}"
printf 'source "%s/provides/toolchains.in"\n' "${br2_ext}"
printf '\n'
else
printf '# No toolchain from: %s\n\n' "${br2_desc}"
fi >>"${outputdir}/.br2-external.in.toolchains"
done
printf 'endmenu\n' >>"${outputdir}/.br2-external.in.menus"