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core/br2-external: properly report unexpected errors

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Unextected error in the br2-external script are properly caught, but
they are not reported properly, and we end up in either of two
situations:

  - the .br2-external.mk file is not generated, in which case make will
    try to find a rule to generate it (because the 'include' directive
    tries to generate missing files);

  - the .br-external.mk file is generated but does not contain the error
    variable, and thus the build might not get interrupted.

We fix that by using a trap on the pseudo ERR signal, to emit the error
variable on unexpected errors.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Yann E. MORIN 2017-01-28 11:41:32 +01:00 committed by Thomas Petazzoni
parent f30a3940c8
commit c5fa9308ea
1 changed files with 3 additions and 0 deletions
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3
support/scripts/br2-external
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@ -40,6 +40,9 @@ main() {
exec >"${ofile}" exec >"${ofile}"
# Trap any unexpected error to generate a meaningful error message
trap "error 'unexpected error while generating ${ofile}\n'" ERR
do_validate ${@//:/ } do_validate ${@//:/ }
do_${ofmt} do_${ofmt}